JP3820700B2 - Noise shielding structure of power converter - Google Patents

Noise shielding structure of power converter Download PDF

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JP3820700B2
JP3820700B2 JP24073997A JP24073997A JP3820700B2 JP 3820700 B2 JP3820700 B2 JP 3820700B2 JP 24073997 A JP24073997 A JP 24073997A JP 24073997 A JP24073997 A JP 24073997A JP 3820700 B2 JP3820700 B2 JP 3820700B2
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shielding plate
hole
noise
convex portion
shielding
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JPH10290093A (en
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徹 掛林
正猛 吉原
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Meidensha Corp
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Meidensha Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は電力変換装置のノイズ遮蔽構造に関し、特にインバータ装置等、主回路部品としてスイッチングノイズの発生源となる素子を有するものに適用して有用なものである。
【０００２】
【従来の技術】
インバータ装置等の電力変換装置においてはその主回路がＩＧＢＴ等のスイッチング素子を含む。この場合スイッチング素子はスイッチングノイズの発生源となる。そこで、主回路を構成するスイッチング素子を収納するアルミダイカスト若しくは樹脂成形の筺体とこの主回路の制御回路を構成する基板からなる制御部との間にはノイズ遮蔽用の遮蔽板を介在させ、スイッチングノイズが制御部の動作に悪影響を与えないように工夫している。
【０００３】
図７はこの種の遮蔽板を有する従来技術に係るインバータ装置を示す斜視図である。同図に示すように、主回路を構成するインバータ回路１、２はヒートシンク３上に載置してある。インバータ回路１、２とこのインバータ回路１、２の制御回路を構成する基板からなる制御部４との間にはノイズの遮蔽板５が介在させてある。側板６、７はヒートシンク３に立設した垂直な壁面である。制御部４を載置している遮蔽板５は、その後端をヒンジ部８を介して側板７に回動可能に取り付ける一方、その前端が側板６の上端に当接することにより遮蔽板５の下方への回動を規制するように構成してある。インバータ回路１、２と制御部４とはハーネス９及びコネクタ１０を介して接続してある。
【０００４】
かかるインバータ装置において、インバータ回路１、２の保守作業の際には、ヒンジ部８を回動中心として遮蔽板５を上方に回動し、側板６、７の上端部を開口してこれら側板６、７で区切られる作業空間を確保している。
【０００５】
ところが、上述の如き従来技術においては、保守作業時の作業性は良好に確保しを得るが、側板６、７及びヒンジ部８等の部品点数が多く、組み立て時の作業性に難があるという問題がある。
【０００６】
一方、制御部４を載置した遮蔽板５をインバータ回路１、２の筐体に直接ネジ等で固定する方法もあるが、この場合には保守作業時に遮蔽板５を取り外さなければならず、保守作業時の作業性に難があるという問題がある。
【０００７】
本発明は、上記従来技術に鑑み、部品点数を可及的に低減し得るとともに保守作業の作業性も良好に確保し得る電力変換装置のノイズ遮蔽構造を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記目的を達成する本発明の構成は次の点を特徴とする。
【０００９】
１） インバータ回路等、スイッチングノイズの発生源となる主回路部品を収納する筺体の上面等の平面に立設するとともに、両端部における上部から水平に突出された２個の凸部を有する側板と、
後端部の少なくとも一方の側面に下方に向かって開口する切欠き部及びこの切欠き部にそれぞれ連通している孔若しくは一方は切欠き部に連通しない孔を有するとともに、少なくとも一方は切欠き部を介して各孔に上記凸部を嵌入することにより各孔及び凸部でヒンジ部を構成し、このヒンジ部を回動中心として回動するように構成した平面である遮蔽板と、
遮蔽板の前端部から下方に垂下してその先端が上記平面に当接し、遮蔽板の下方への回動を規制するように構成した脚部とを有することを特徴とする。
【００１０】
２） インバータ回路等、スイッチングノイズの発生源となる主回路部品を収納する筺体の上面等の平面に立設するとともに、両端部における上部から水平に突出された２個の凸部を有する側板と、
後端部の少なくとも一方の側面に下方に向かって開口する切欠き部及びこの切欠き部にそれぞれ連通している孔若しくは一方は切欠部に連通しない孔を有するとともに、少なくとも一方は切欠き部を介して各孔に上記凸部を嵌入することにより各孔及び凸部でヒンジ部を構成し、このヒンジ部を回動中心として回動するように構成した平面である遮蔽板と、
上記平面から上方に伸びて突出しその先端が遮蔽板の前端部に当接して遮蔽板の下方への回動を規制するように構成した脚部とを有することを特徴とする。
【００１１】
３） 上記（２）において、脚部は筐体の上面に一体的に設けたものであることを特徴とする。
【００１２】
４） 上記（１）〜（３）において、遮蔽板の後端が下垂するように折り曲げて折曲部を形成し、遮蔽板の上方への回動に伴い折曲部の下端が側板に当接して遮蔽板の上方への回動を規制するように構成したことを特徴とする。
【００１３】
５） （１）〜（３）において、遮蔽板の後端を同一平面で後方に突出させ、遮蔽板の上方への回動に伴い後端が側板に当接して遮蔽板の上方への回動を規制するように構成したことを特徴とする。
【００１４】
６） インバータ回路等、スイッチングノイズの発生源となる主回路部品を収納する筺体に立設するとともに、先端の上端部から垂直上方に突出された上凸部及び先端の下端部から垂直下方に突出された下凸部を有する側板と、前記上凸部及び下凸部がそれぞれ後端部に形成した孔を貫通することにより各孔及び上下凸部でヒンジ部を形成し、このヒンジ部を回動中心として回動するように構成した平面である遮蔽板とを有する電力変換装置のノイズ遮蔽構造において、
前記上凸部はその左右の両辺間の幅が下方に向かって漸増するテーパー部となり且つこのテーパー部の下端で内側に切れ込む返し部を有するように構成するとともに、前記下凸部はその垂直方向の長さが上凸部の垂直方向の長さよりも長くなるように構成する一方、
前記遮蔽板はその上凸部を挿入する孔の径が上凸部のテーパー部の最大幅よりも小さくなるように構成したこと。
【００１５】
【発明の実施の形態】
以下本発明の実施の形態を図面に基づき詳細に説明する。
【００１６】
図１は本発明の第１の実施の形態に係るノイズ遮蔽構造を電力変換装置であるインバータ装置に適用した状態で示す斜視図、図２はその遮蔽板１１を抽出して示す斜視図、図３はその側板１２を抽出して示す斜視図である。遮蔽板１１は、図１及び図２に示すように、その後端部の両側の側面に下方に向かってそれぞれ開口する切欠き部１１ａ、１１ｂ及びこの切欠き部１１ａ、１１ｂにそれぞれ連通している孔１１ｃ、１１ｄを有するとともに、その前端部から下方に垂下している脚部１１ｅ、１１ｆを有している。また、遮蔽板１１の後端は下垂するように折り曲げた折曲部１１ｇとして形成してある。
【００１７】
側板１２は、図１及び図２に示すように、両端部における上部から水平に突出された２個の凸部１２ａ、１２ｂを有する部材である。
【００１８】
かかる遮蔽板１１及び側板１２で本形態に係るノイズ遮蔽構造を構成する。すなわち、遮蔽板１１の各切欠き部１１ａ、１１ｂ（この切欠き部１１ａ、１１ｂは何れか一方だけでも良い）を介して各孔１１ｃ、１１ｄに上記凸部１２ａ、１２ｂを嵌入することにより各孔１１ｃ、１１ｄ及び凸部１２ａ、１２ｂでヒンジ部を構成し、このヒンジ部を回動中心として遮蔽板１１を回動するように構成したものである。このとき側板１２は、図１の二点鎖線で示す位置から図中反時計方向に回動し、垂直に立てた状態で筐体１３ａの表面に固定するとともに、遮蔽板１１の脚部１１ｅ、１１ｆは筐体１３ａの表面に当接して遮蔽板１１の下方への回動を規制するように構成してある。また、遮蔽板１１の上方への回動は折曲部１１ｇの下端が側板１２に当接することにより規制する。したがって、遮蔽板１１は上方に若干回動した時点でその上方への回動が規制される。インバータ回路１３の制御回路を構成する制御部１４は遮蔽板１１の上面に載置してあり、インバータ回路１３との間に遮蔽板１１が介在するように構成してある。
【００１９】
かかる本形態によれば、インバータ回路１３が発生するスイッチングノイズは遮蔽板１１で遮蔽される。また、インバータ回路１３の保守点検時には遮蔽板１１をヒンジ部を回動中心として上方に回動することによりインバータ回路１３の上方に作業空間を確保することができる。このとき遮蔽板１１は折曲部１１ｇが側板１２に当接してその上方への回動が規制されるので、切欠き部１１ａ、１１ｂが上方に向かって開口することはなく、凸部１２ａ、１２ｂが孔１１ｃ、１１ｄから外れることはない。
【００２０】
図４は本発明の第２の実施の形態に係るノイズ遮蔽構造の遮蔽板を抽出して示す斜視図である。同図に示すように本形態に係る遮蔽板２１は、第１の実施の形態の折曲部１１ｇ（図１参照）の代わりにその後端を同一平面（図４に示す通常時の状態の水平面）で後方に突出させた突出部２１ａを有するものであり、他の構成は第１の実施の形態と同様である。そこで図１と同一部分には同一番号を付し重複する説明及び側板１２と一体化した図は省略する。
【００２１】
かかる実施の形態では、遮蔽板２１はその上方への回動に伴いほぼ９０度回動して垂直に起立した状態で突出部２１ａが側板１２（図１参照）に当接し、この状態でその上方への回動が規制される。この場合も前記第１の実施の形態と同様の理由で遮蔽板２１が側板１２の孔１１ｃ、１１ｄから外れることはない。一方、この場合には第１の実施の形態よりも大きく遮蔽板２１を開くことができるので、その分大きな保守作業時の作業空間を確保することができる。
【００２２】
図５は本発明の第３の実施の形態に係るノイズ遮蔽構造を示す斜視図である。同図に示すように、本形態では第１の実施の形態における脚部１１ｅ、１１ｆの代わりに、インバータ回路３３の筐体３３ａの上面に垂直上方に向かう脚部３３ｂ、３３ｃを設けたものである。したがって遮蔽板３１は脚部１１ｅ、１１ｆを有していない点を除き他の構成は遮蔽板１１等と同じである。そこで、図１と同一部分には同一番号を付し重複する説明は省略する。
【００２３】
本形態の場合も第１の実施の形態と同態様で使用し得る。また、このとき、折曲部１１の代わりに突出部２１ａを形成しても勿論良い。
【００２４】
なお、上記第１及び第２の実施の形態では何れもインバータ回路１３、３３の筐体１３ａ、３３ａの上面に各遮断構造を形成したが、必ずしもこの様に構成する場合に限られない。インバータ回路１３、３３と制御部１４との間に遮蔽板１１、２１、３１が介在される構造であれば良い。
【００２５】
図６（ａ）は本発明の第４の実施の形態に係るノイズ遮蔽構造を示す斜視図である。同図に示すように、本形態はスイッチングノイズの発生源となる主回路部品を収納するインバータ回路４３の筐体４３ａが垂直に配設される場合である。すなわち、本形態における制御部１４を載置する遮蔽板４１が垂直面を形成している場合である。したがって、本形態における側板４２は先端の上端部から垂直上方に突出された上凸部４２ａ及び先端の下端部から垂直下方に突出された下凸部４２ｂを有している。一方、遮蔽板４１は上凸部４２ａ及び下凸部４２ｂがそれぞれ後端部に形成した孔４１ａ、４１ｂを貫通することにより各孔４１ａ、４１ｂ及び上下凸部４２ａ、４２ｂでヒンジ部を形成し、このヒンジ部を回動中心として垂直軸回りに回動するように構成してある。本形態において側板４２はその基端部を筐体４３ａの側板の内周面に固着してある。ただ、このように側板４２の基端部を筐体４３ａの側板の内周面に固着する必要は必ずしもない。筐体４３ａを第１〜第３の実施の形態と同様にそれ自体が別途蓋を有するものであっても良い。この場合には垂直面となる蓋に側板４２の基端部を固着し、遮蔽板４１の前端部に第１〜第３の実施の形態の場合と同様の脚部１１ｅ、１１ｆ、３３ｂ、３３ｃを設ければ良い。
【００２６】
前記上凸部４２ａは、特にこの部分（図６（ａ）のＡ部分）を抽出・拡大して図６（ｂ）に示すように、その左右の両辺間の幅が下方に向かって漸増するテーパー部４２ａ1 、４２ａ2 となり且つこのテーパー部４２ａ1 、４２ａ2 の下端で内側に切れ込む返し部４２ａ3 を有するように構成してある。また、前記下凸部４２ｂはその垂直方向の長さが上凸部４２ａの垂直方向の長さよりも長くなるように構成してある。かくして、先ず孔４１ｂに下凸部４２ｂをその上端部まで挿入し、その後孔４１ａを上凸部４２ａにその下端部まで挿入しても孔４１ｂが下凸部４２ｂから抜け出ることはない。さらに、遮蔽板４１はその孔４１ａの径Ｄが上凸部４２ａのテーパー部４２ａ1 、４２ａ2 の最大幅Ｌよりも若干小さくなるように構成してある。かくして、孔４１ａを上凸部４２ａに挿入する場合には、最初はテーパー部４２ａ1 、４２ａ2 の小径部を介して簡単に挿入させることができ、最後に最大幅Ｌの部分を大きな抵抗に抗して通過させることにより、一旦上凸部４２ａに挿入された孔４１ａは返し部４２ａ3 に規制されて抜けることはない。すなわち、運搬時若しくは作業者が遮蔽板４１に接触した場合でもこの遮蔽板４１が側板４２から抜けることはない。
【００２７】
かかる本形態によれば、インバータ回路４３が発生するスイッチングノイズは遮蔽板４１で遮蔽される。また、インバータ回路４３の保守点検時には遮蔽板４１をヒンジ部を回動中心として回動することによりインバータ回路４３の前方に作業空間を確保することができる。また、上凸部４２ａに挿入された孔４１ａは返し部４２ａ3 に規制されているため、運搬時若しくは作業者が遮蔽板４１に接触して大きな振動及び外力が作用した場合でもこの遮蔽板４１が側板４２から抜けることはない。
【００２８】
【発明の効果】
以上実施の形態とともに詳細に説明したように、本発明によればインバータ等の電力変換装置の保守作業は簡易に行うことができるばかりてなく、その組み立て工数も大幅に低減し得る。
【図面の簡単な説明】
【図１】 本発明の第１の実施の形態に係るノイズ遮蔽構造を電力変換装置であるインバータ装置に適用した状態で示す斜視図。
【図２】図１の遮蔽板１１を抽出して示す斜視図。
【図３】図１の側板１２を抽出して示す斜視図。
【図４】本発明の第２の実施の形態に係るノイズ遮蔽構造の遮蔽板を抽出して示す斜視図。
【図５】本発明の第３の実施の形態に係るノイズ遮蔽構造を示す斜視図。
【図６】本発明の第４の実施の形態に係るノイズ遮蔽構造を示す図で、（ａ）はその斜視図、（ｂ）は（ａ）のＡ部分を抽出・拡大して示す部分拡大図。
【図７】従来技術を示す斜視図。
【符号の説明】
１１、２１、３１、４１ 遮蔽板
１１ａ、１１ｂ 切欠き部
１１ｃ、１１ｄ、４１ａ、４１ｂ 孔
１１ｅ、１１ｆ、３３ｂ、３３ｃ 脚部
１２、４２ 側板
１２ａ、１２ｂ 凸部
１３、３３、４３ インバータ回路
１３ａ、３３ａ、４３ａ 筐体
１４ 制御部
４２ａ 上凸部
４２ｂ 下凸部
４２ａ1 、４２ａ2 テーパー部
４２ａ3 返し部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a noise shielding structure for a power converter, and is particularly useful when applied to an inverter device or the like that has an element that is a source of switching noise as a main circuit component.
[0002]
[Prior art]
In a power conversion device such as an inverter device, the main circuit includes a switching element such as an IGBT. In this case, the switching element is a source of switching noise. Therefore, a shielding plate for noise shielding is interposed between the aluminum die-casting or resin-molded housing for housing the switching elements constituting the main circuit and the control unit comprising the substrate constituting the control circuit of the main circuit, and switching is performed. It is devised so that noise does not adversely affect the operation of the control unit.
[0003]
FIG. 7 is a perspective view showing an inverter device according to the prior art having this type of shielding plate. As shown in the figure, inverter circuits 1 and 2 constituting the main circuit are placed on a heat sink 3. A noise shielding plate 5 is interposed between the inverter circuits 1 and 2 and the control unit 4 made of a substrate constituting the control circuit of the inverter circuits 1 and 2. The side plates 6 and 7 are vertical wall surfaces erected on the heat sink 3. The shielding plate 5 on which the control unit 4 is placed is pivotally attached to the side plate 7 with its rear end via the hinge portion 8, while its front end is in contact with the upper end of the side plate 6, thereby lowering the shielding plate 5. It is comprised so that rotation to may be controlled. The inverter circuits 1 and 2 and the control unit 4 are connected via a harness 9 and a connector 10.
[0004]
In such an inverter device, during maintenance work of the inverter circuits 1 and 2, the shielding plate 5 is rotated upward with the hinge portion 8 as the rotation center, and the upper ends of the side plates 6 and 7 are opened to open these side plates 6. , 7 is secured.
[0005]
However, in the prior art as described above, the workability at the time of maintenance work can be ensured satisfactorily, but the number of parts such as the side plates 6, 7 and the hinge portion 8 is large, and the workability at the time of assembly is difficult. There's a problem.
[0006]
On the other hand, there is a method of directly fixing the shielding plate 5 on which the control unit 4 is mounted to the casings of the inverter circuits 1 and 2 with screws or the like. In this case, the shielding plate 5 must be removed during maintenance work. There is a problem that workability during maintenance work is difficult.
[0007]
An object of the present invention is to provide a noise shielding structure for a power conversion device that can reduce the number of components as much as possible and can ensure good workability of maintenance work.
[0008]
[Means for Solving the Problems]
The configuration of the present invention that achieves the above object is characterized by the following points.
[0009]
1) A side plate having two protrusions that are erected on a flat surface such as an inverter circuit or the like that houses a main circuit component that generates switching noise, and that protrudes horizontally from the upper part at both ends. ,
At least one side surface of the rear end portion has a notch portion opening downward and a hole communicating with the notch portion or one hole not communicating with the notch portion, and at least one notch portion A shielding plate, which is a plane configured to rotate about the hinge portion as a rotation center, by forming a hinge portion with each hole and the convex portion by inserting the convex portion into each hole via,
And a leg portion configured to hang downward from the front end portion of the shielding plate, the tip of which contacts the flat surface, and restricts the downward rotation of the shielding plate.
[0010]
2) A side plate having two convex portions that are erected on a flat surface such as an upper surface of a housing that houses a main circuit component that generates switching noise, such as an inverter circuit, and that protrudes horizontally from the upper portion at both ends. ,
At least one side surface of the rear end portion has a notch portion opening downward and a hole communicating with the notch portion or one hole not communicating with the notch portion, and at least one has a notch portion. A shielding plate that is a flat surface configured to rotate around the hinge portion by forming a hinge portion at each hole and the convex portion by inserting the convex portion into each hole via,
And a leg portion that extends upward from the plane and protrudes so that its tip abuts against the front end portion of the shielding plate to restrict the downward rotation of the shielding plate.
[0011]
3) In the above (2), the leg portion is provided integrally on the upper surface of the housing.
[0012]
4) In the above (1) to (3), a bent portion is formed by bending so that the rear end of the shielding plate hangs down, and the lower end of the bent portion contacts the side plate as the shielding plate is rotated upward. It is configured to be in contact with and regulate the upward rotation of the shielding plate.
[0013]
5) In (1) to (3), the rear end of the shielding plate is projected rearward on the same plane, and the rear end comes into contact with the side plate as the shielding plate is rotated upward, and the shielding plate is rotated upward. It is configured to restrict movement.
[0014]
6) Stands up on the housing that houses the main circuit components that generate switching noise, such as inverter circuits, and projects vertically upward from the upper end of the tip and vertically downward from the lower end of the tip. By forming a side plate having a lower convex portion and a hole formed in the rear end portion of each of the upper convex portion and the lower convex portion, a hinge portion is formed by each hole and the upper and lower convex portions. In the noise shielding structure of the power converter having a shielding plate that is a plane configured to rotate as a moving center,
The upper convex portion is configured to have a tapered portion in which the width between the left and right sides gradually increases downward, and has a return portion that cuts inward at the lower end of the tapered portion, and the lower convex portion has a vertical direction While the length of is configured to be longer than the vertical length of the upper convex portion,
The said shielding board was comprised so that the diameter of the hole which inserts the upper convex part may become smaller than the maximum width of the taper part of an upper convex part.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0016]
FIG. 1 is a perspective view showing a state in which the noise shielding structure according to the first embodiment of the present invention is applied to an inverter device which is a power converter, and FIG. 2 is a perspective view showing an extracted shielding plate 11. 3 is a perspective view showing the side plate 12 extracted. As shown in FIGS. 1 and 2, the shielding plate 11 communicates with the notches 11a and 11b and the notches 11a and 11b that open downward on the side surfaces on both sides of the rear end portion, respectively. It has holes 11c and 11d, and leg portions 11e and 11f that hang downward from its front end. The rear end of the shielding plate 11 is formed as a bent portion 11g that is bent so as to hang down.
[0017]
As shown in FIGS. 1 and 2 , the side plate 12 is a member having two convex portions 12 a and 12 b that protrude horizontally from the upper portions at both ends.
[0018]
The shielding plate 11 and the side plate 12 constitute a noise shielding structure according to this embodiment. That is, by inserting the convex portions 12a and 12b into the holes 11c and 11d through the cutout portions 11a and 11b (the cutout portions 11a and 11b may be either one), respectively, of the shielding plate 11. The holes 11c and 11d and the convex portions 12a and 12b constitute a hinge portion, and the shielding plate 11 is turned around the hinge portion as a turning center. At this time, the side plate 12 rotates counterclockwise from the position indicated by the two-dot chain line in FIG. 1 and is fixed to the surface of the housing 13a in a vertically standing state, and the leg portion 11e of the shielding plate 11 is provided. 11f is configured to abut on the surface of the housing 13a to restrict the downward rotation of the shielding plate 11. Further, the upward rotation of the shielding plate 11 is restricted by the lower end of the bent portion 11g coming into contact with the side plate 12. Therefore, when the shielding plate 11 is slightly rotated upward, the upward rotation is restricted. The control part 14 which comprises the control circuit of the inverter circuit 13 is mounted in the upper surface of the shielding board 11, and it is comprised so that the shielding board 11 may interpose between the inverter circuits 13. FIG.
[0019]
According to this embodiment, the switching noise generated by the inverter circuit 13 is shielded by the shielding plate 11. Further, when the inverter circuit 13 is maintained and inspected, the work space can be secured above the inverter circuit 13 by rotating the shielding plate 11 upward about the hinge portion. At this time, since the bent portion 11g contacts the side plate 12 and the upward rotation of the shielding plate 11 is restricted, the notches 11a and 11b do not open upward, and the convex portion 12a, 12b does not come off the holes 11c and 11d.
[0020]
FIG. 4 is a perspective view showing an extracted screen of the noise shielding structure according to the second embodiment of the present invention. As shown in the figure, the shielding plate 21 according to the present embodiment has a rear surface on the same plane (the horizontal plane in the normal state shown in FIG. 4) instead of the bent portion 11g (see FIG. 1) of the first embodiment. ), And the other configuration is the same as that of the first embodiment. Therefore, the same parts as those in FIG. 1 are denoted by the same reference numerals, and overlapping description and illustrations integrated with the side plate 12 are omitted.
[0021]
In such an embodiment, the projection 21a contacts the side plate 12 (see FIG. 1) in a state where the shielding plate 21 is rotated approximately 90 degrees as it is rotated upward and vertically stands, and in this state, The upward rotation is restricted. Also in this case, the shielding plate 21 does not come off from the holes 11c and 11d of the side plate 12 for the same reason as in the first embodiment. On the other hand, in this case, since the shielding plate 21 can be opened larger than in the first embodiment, it is possible to secure a larger work space for maintenance work.
[0022]
FIG. 5 is a perspective view showing a noise shielding structure according to the third embodiment of the present invention. As shown in the figure, in this embodiment, instead of the legs 11e and 11f in the first embodiment, legs 33b and 33c extending vertically upward are provided on the upper surface of the casing 33a of the inverter circuit 33. is there. Accordingly, the shield plate 31 is the same as the shield plate 11 and the like except that the shield plate 31 does not have the leg portions 11e and 11f. Therefore, the same parts as those in FIG.
[0023]
The present embodiment can also be used in the same manner as the first embodiment. Further, at this time, the protruding portion 21a may be formed instead of the bent portion 11.
[0024]
In each of the first and second embodiments, the blocking structures are formed on the top surfaces of the casings 13a and 33a of the inverter circuits 13 and 33. However, the present invention is not necessarily limited to this configuration. Any structure in which the shielding plates 11, 21, and 31 are interposed between the inverter circuits 13 and 33 and the control unit 14 may be used.
[0025]
FIG. 6A is a perspective view showing a noise shielding structure according to the fourth embodiment of the present invention. As shown in the figure, the present embodiment is a case where a casing 43a of an inverter circuit 43 that houses a main circuit component that is a source of switching noise is arranged vertically. That is, this is a case where the shielding plate 41 on which the control unit 14 in this embodiment is placed forms a vertical surface. Therefore, the side plate 42 in the present embodiment has an upper convex portion 42a that protrudes vertically upward from the upper end portion of the tip, and a lower convex portion 42b that protrudes vertically downward from the lower end portion of the tip. On the other hand, the shielding plate 41 forms a hinge portion with the holes 41a and 41b and the upper and lower convex portions 42a and 42b by passing through the holes 41a and 41b formed in the rear end portions of the upper convex portion 42a and the lower convex portion 42b, respectively. The hinge portion is configured to rotate about the vertical axis with the rotation center as a rotation center. In this embodiment, the side plate 42 has its base end fixed to the inner peripheral surface of the side plate of the housing 43a. However, it is not always necessary to fix the base end portion of the side plate 42 to the inner peripheral surface of the side plate of the housing 43a. The housing 43a itself may have a separate lid as in the first to third embodiments. In this case, the base end portion of the side plate 42 is fixed to the lid that is a vertical surface, and the leg portions 11e, 11f, 33b, 33c similar to those in the first to third embodiments are attached to the front end portion of the shielding plate 41. Should be provided.
[0026]
The upper convex portion 42a is particularly extracted and enlarged from this portion (A portion in FIG. 6A), and as shown in FIG. 6B, the width between the left and right sides gradually increases downward. The taper portions 42a 1 and 42a 2 are formed , and the taper portions 42a 1 and 42a 2 have a return portion 42a 3 that cuts inwardly at the lower ends thereof. Further, the lower convex portion 42b is configured such that its vertical length is longer than the vertical length of the upper convex portion 42a. Thus, even if the lower convex portion 42b is first inserted into the hole 41b up to its upper end and then the hole 41a is inserted into the upper convex portion 42a up to its lower end, the hole 41b does not come out of the lower convex portion 42b. Further, the shielding plate 41 is configured such that the diameter D of the hole 41a is slightly smaller than the maximum width L of the tapered portions 42a 1 and 42a 2 of the upper convex portion 42a. Thus, when the hole 41a is inserted into the upper convex portion 42a, the hole 41a can be easily inserted through the small diameter portions of the tapered portions 42a 1 and 42a 2 at the end, and finally the portion of the maximum width L becomes a large resistance. By making it pass against, the hole 41a once inserted in the upper convex part 42a is regulated by the return part 42a 3 and does not come off. In other words, the shield plate 41 does not come off the side plate 42 even during transportation or when an operator contacts the shield plate 41.
[0027]
According to this embodiment, the switching noise generated by the inverter circuit 43 is shielded by the shielding plate 41. Further, when the inverter circuit 43 is maintained and inspected, the work space can be secured in front of the inverter circuit 43 by rotating the shielding plate 41 around the hinge portion as a rotation center. Further, since the hole 41a inserted into the upper convex portion 42a is restricted by the return portion 42a 3 , even when a large vibration and external force are applied during transportation or when an operator contacts the shielding plate 41, the shielding plate 41 is used. Does not escape from the side plate 42.
[0028]
【The invention's effect】
As described in detail with the above embodiments, according to the present invention, not only can maintenance work for a power converter such as an inverter be performed easily, but also the number of assembly steps can be significantly reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state in which a noise shielding structure according to a first embodiment of the present invention is applied to an inverter device that is a power converter.
FIG. 2 is a perspective view showing an extracted shield plate 11 of FIG.
3 is a perspective view showing an extracted side plate 12 of FIG. 1. FIG.
FIG. 4 is a perspective view showing an extracted shielding plate having a noise shielding structure according to a second embodiment of the present invention.
FIG. 5 is a perspective view showing a noise shielding structure according to a third embodiment of the present invention.
6A and 6B are diagrams showing a noise shielding structure according to a fourth embodiment of the present invention, in which FIG. 6A is a perspective view thereof, and FIG. 6B is a partially enlarged view showing an extracted and enlarged portion A of FIG. Figure.
FIG. 7 is a perspective view showing a conventional technique.
[Explanation of symbols]
11, 21, 31, 41 Shield plate 11a, 11b Notch portion 11c, 11d, 41a, 41b Hole 11e, 11f, 33b, 33c Leg portion 12, 42 Side plate 12a, 12b Protrusion portion 13, 33, 43 Inverter circuit 13a, 33a, 43a housing 14 controller 42a upward convex portion 42b under the convex portion 42a 1, 42a 2 taper portion 42a 3 return part

Claims (6)

インバータ回路等、スイッチングノイズの発生源となる主回路部品を収納する筺体の上面等の平面に立設するとともに、両端部における上部から水平に突出された２個の凸部を有する側板と、
後端部の少なくとも一方の側面に下方に向かって開口する切欠き部及びこの切欠き部にそれぞれ連通している孔若しくは一方は切欠き部に連通しない孔を有するとともに、少なくとも一方は切欠き部を介して各孔に上記凸部を嵌入することにより各孔及び凸部でヒンジ部を構成し、このヒンジ部を回動中心として回動するように構成した平面である遮蔽板と、
遮蔽板の前端部から下方に垂下してその先端が上記平面に当接し、遮蔽板の下方への回動を規制するように構成した脚部とを有することを特徴とする電力変換装置のノイズ遮蔽構造。A side plate having two convex portions protruding horizontally from the upper portions at both ends while being erected on a plane such as an upper surface of a housing that houses a main circuit component that is a source of switching noise, such as an inverter circuit,
At least one side surface of the rear end portion has a notch portion opening downward and a hole communicating with the notch portion or one hole not communicating with the notch portion, and at least one notch portion A shielding plate, which is a plane configured to rotate about the hinge portion as a rotation center, by forming a hinge portion with each hole and the convex portion by inserting the convex portion into each hole via,
A noise of a power conversion device comprising: a leg portion that hangs downward from a front end portion of the shielding plate and has a tip abutting against the flat surface and configured to regulate the downward rotation of the shielding plate. Shielding structure. インバータ回路等、スイッチングノイズの発生源となる主回路部品を収納する筺体の上面等の平面に立設するとともに、両端部における上部から水平に突出された２個の凸部を有する側板と、
後端部の少なくとも一方の側面に下方に向かって開口する切欠き部及びこの切欠き部にそれぞれ連通している孔若しくは一方は切欠部に連通しない孔を有するとともに、少なくとも一方は切欠き部を介して各孔に上記凸部を嵌入することにより各孔及び凸部でヒンジ部を構成し、このヒンジ部を回動中心として回動するように構成した平面である遮蔽板と、
上記平面から上方に伸びて突出しその先端が遮蔽板の前端部に当接して遮蔽板の下方への回動を規制するように構成した脚部とを有することを特徴とする電力変換装置のノイズ遮蔽構造。A side plate having two convex portions protruding horizontally from the upper portions at both ends while being erected on a plane such as an upper surface of a housing that houses a main circuit component that is a source of switching noise, such as an inverter circuit,
At least one side surface of the rear end portion has a notch portion opening downward and a hole communicating with the notch portion or one hole not communicating with the notch portion, and at least one has a notch portion. A shielding plate that is a flat surface configured to rotate around the hinge portion by forming a hinge portion at each hole and the convex portion by inserting the convex portion into each hole via,
A noise of a power conversion device comprising: a leg portion extending upward from the plane and having a front end configured to abut against a front end portion of the shielding plate to restrict downward rotation of the shielding plate Shielding structure. 〔請求項２〕において、脚部は筐体の上面に一体的に設けたものであることを特徴とする電力変換装置のノイズ遮蔽構造。[Claim 2] A noise shielding structure for a power conversion device according to claim 2, wherein the leg portion is integrally provided on the upper surface of the casing. 〔請求項１〕〜〔請求項３〕において、遮蔽板の後端が下垂するように折り曲げて折曲部を形成し、遮蔽板の上方への回動に伴い折曲部の下端が側板に当接して遮蔽板の上方への回動を規制するように構成したことを特徴とする電力変換装置のノイズ遮蔽構造。In [Claim 1] to [Claim 3], the bent portion is formed by bending so that the rear end of the shielding plate hangs down, and the lower end of the bent portion is turned to the side plate as the shielding plate is rotated upward. A noise shielding structure for a power conversion device, wherein the noise shielding structure is configured to be in contact with and regulate upward rotation of the shielding plate. 〔請求項１〕〜〔請求項３〕において、遮蔽板の後端を同一平面で後方に突出させ、遮蔽板の上方への回動に伴い後端が側板に当接して遮蔽板の上方への回動を規制するように構成したことを特徴とする電力変換装置のノイズ遮蔽構造。In [Claim 1] to [Claim 3], the rear end of the shielding plate projects rearward in the same plane, and the rear end comes into contact with the side plate as the shielding plate pivots upward, and moves upward of the shielding plate. A noise shielding structure for a power converter, which is configured to restrict rotation of the power converter. インバータ回路等、スイッチングノイズの発生源となる主回路部品を収納する筺体に立設するとともに、先端の上端部から垂直上方に突出された上凸部及び先端の下端部から垂直下方に突出された下凸部を有する側板と、前記上凸部及び下凸部がそれぞれ後端部に形成した孔を貫通することにより各孔及び上下凸部でヒンジ部を形成し、このヒンジ部を回動中心として回動するように構成した平面である遮蔽板とを有する電力変換装置のノイズ遮蔽構造において、
前記上凸部はその左右の両辺間の幅が下方に向かって漸増するテーパー部となり且つこのテーパー部の下端で内側に切れ込む返し部を有するように構成するとともに、前記下凸部はその垂直方向の長さが上凸部の垂直方向の長さよりも長くなるように構成する一方、
前記遮蔽板はその上凸部を挿入する孔の径が上凸部のテーパー部の最大幅よりも小さくなるように構成したことを特徴とする電力変換装置のノイズ遮蔽構造。Standing up on the housing that houses the main circuit components that generate switching noise, such as inverter circuits, and protruded vertically upward from the upper end of the tip and vertically downward from the lower end of the tip By forming a side plate having a lower convex portion and a hole formed in the rear end portion of each of the upper convex portion and the lower convex portion, a hinge portion is formed by each hole and the upper and lower convex portions. In the noise shielding structure of the power converter having a shielding plate that is a plane configured to rotate as
The upper convex portion is configured to have a tapered portion in which the width between the left and right sides gradually increases downward, and has a return portion that cuts inward at the lower end of the tapered portion, and the lower convex portion has a vertical direction While the length of is configured to be longer than the vertical length of the upper convex portion,
A noise shielding structure for a power conversion device, wherein the shielding plate is configured such that a diameter of a hole into which the upward convex portion is inserted is smaller than a maximum width of a tapered portion of the upward convex portion.
JP24073997A 1997-02-12 1997-09-05 Noise shielding structure of power converter Expired - Fee Related JP3820700B2 (en)

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