JP2015084609A - Cooling device of connection conductor and electric power conversion system using the same - Google Patents

Cooling device of connection conductor and electric power conversion system using the same Download PDF

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JP2015084609A
JP2015084609A JP2013221686A JP2013221686A JP2015084609A JP 2015084609 A JP2015084609 A JP 2015084609A JP 2013221686 A JP2013221686 A JP 2013221686A JP 2013221686 A JP2013221686 A JP 2013221686A JP 2015084609 A JP2015084609 A JP 2015084609A
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heat transfer
connection
connection conductor
cooler
transfer body
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JP5714077B2 (en
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拓哉 中村
Takuya Nakamura
拓哉 中村
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a cooling device of a connection conductor which efficiently cools the connection conductor, such as a bus bar, in which a temperature is increased by heat received from an electric device, such as a semiconductor element, and heat generated by the connection conductor itself, is small, and shortens a length of the connection conductor, and to provide an electric power conversion system using the cooling device of the connection conductor.SOLUTION: A cooling device of a connection conductor includes: a first connection conductor 2 which is led out from a first electric device 1 and has a first connection part 2a; a cooler 5; a heat transfer body 3 which is provided between the cooler and the first connection part and transfers heat of the first connection conductor to the cooler; and an electric insulative heat transfer material 4 disposed in one of areas between the heat transfer body and the cooler and between the heat transfer body and the first connection conductor.

Description

この発明は、放熱対策を要する例えば電力変換装置のバスバーの冷却などに好ましく用いられる接続導体の冷却装置及びそれを用いた電力変換装置に関するものである。   The present invention relates to a cooling device for a connection conductor that is preferably used for cooling a bus bar of a power conversion device that requires heat dissipation measures, and a power conversion device using the same.

従来、発熱するバスバーを冷却するために、バスバーにフィンを設置するなどして、空気に放熱する手法が知られている（例えば特許文献１参照）。
また、バスバー自体の温度Ｔ１は、下式の式（７）で表される通り、バスバーの断面積Ｓ１に反比例し、バスバーの長さＬに比例する項とバスバーの表面積Ｓ２に反比例する項の和に発熱量Ｐを乗ずることになる為、バスバーの断面積Ｓ１を拡大、もしくはバスバーの長さＬを短くする、あるいは、バスバーの表面積Ｓ２を拡大することで、バスバーの温度を抑える方法が知られている。
ΔＴ＝Ｒｔ×Ｐ・・・・・・・・・・・・・・・・・・・・・・・・・・（１）
Ｒｔ＝Ｒ１＋Ｒ２・・・・・・・・・・・・・・・・・・・・・・・・・（２）
Ｒ１＝Ｌ／（Ｓ１×λ１）・・・・・・・・・・・・・・・・・・・・・（３）
Ｒ２＝１／（ｈ×Ｓ２）・・・・・・・・・・・・・・・・・・・・・・（４）
ΔＴ＝Ｔ１−Ｔ２・・・・・・・・・・・・・・・・・・・・・・・・・（５）
（２）式に（３），（４）式を代入
Ｒｔ＝Ｌ／（Ｓ１×λ１）＋１／（ｈ×Ｓ２）・・・・・・・・・・・・（６）
（１）式に（５），（６）式を代入
Ｔ１−Ｔ２＝｛Ｌ／（Ｓ１×λ１）＋１／（ｈ×Ｓ２）｝×Ｐ
Ｔ１＝｛Ｌ／（Ｓ１×λ１）＋１／（ｈ×Ｓ２）｝×Ｐ＋Ｔ２・・・・・（７）
Ｒｔ：熱抵抗（Ｋ／Ｗ）
Ｐ：発熱量（Ｗ）
Ｔ１：バスバーの温度（Ｋ）
Ｔ２：バスバー周囲雰囲気の温度（Ｋ）
Ｒ１：バスバーの熱抵抗（Ｋ／Ｗ）
Ｒ２：周囲（空気等）の熱抵抗（Ｋ／Ｗ）
Ｌ：バスバー長さ（ｍ）
Ｓ１：バスバー断面積（ｍ２）
λ１：バスバーの材料の熱伝導率（Ｗ／ｍ・Ｋ）
ｈ：周囲（空気等）の熱伝達率（Ｗ／ｍ２・Ｋ）
Ｓ２：バスバー周囲の表面積（ｍ２） Conventionally, in order to cool a bus bar that generates heat, a method of dissipating heat to the air by installing fins on the bus bar is known (for example, see Patent Document 1).
Further, the temperature T1 of the bus bar itself is inversely proportional to the cross-sectional area S1 of the bus bar, and is a term proportional to the bus bar length L and a term inversely proportional to the surface area S2 of the bus bar, as expressed by the following equation (7). Since the heat value P is multiplied by the sum, there is a known method for suppressing the temperature of the bus bar by increasing the cross-sectional area S1 of the bus bar, shortening the length L of the bus bar, or increasing the surface area S2 of the bus bar. It has been.
ΔT = Rt × P (1)
Rt = R1 + R2 (2)
R1 = L / (S1 × λ1) (3)
R2 = 1 / (h × S2) (4)
ΔT = T1-T2 (5)
Substituting Equations (3) and (4) into Equation (2) Rt = L / (S1 × λ1) + 1 / (h × S2) (6)
Substituting Equations (5) and (6) into Equation (1) T1-T2 = {L / (S1 × λ1) + 1 / (h × S2)} × P
T1 = {L / (S1 × λ1) + 1 / (h × S2)} × P + T2 (7)
Rt: Thermal resistance (K / W)
P: calorific value (W)
T1: Bus bar temperature (K)
T2: Bus bar ambient atmosphere temperature (K)
R1: Thermal resistance of bus bar (K / W)
R2: Ambient (air, etc.) thermal resistance (K / W)
L: Bus bar length (m)
S1: Bus bar cross-sectional area (m 2 )
λ1: Thermal conductivity of bus bar material (W / m · K)
h: Heat transfer coefficient of surroundings (air, etc.) (W / m 2 · K)
S2: Surface area around the bus bar (m 2 )

特開平６−１６２８２７号公報（第１頁、図１）JP-A-6-162827 (first page, FIG. 1)

前記のような従来の接続導体の冷却装置で、バスバーにフィンを設置して表面積を拡大する手法で大きな電流を流す用途では、非常に広大なスペースが必要になり、装置全体の大型化に繋がる問題があった。また、大きなフィンを設置できたとしてもバスバーの熱を空気に放熱する場合、熱伝達率に限界があるため発熱したバスバーの熱がフィンの先端まで伝わらず、期待通りの放熱効果が得られないという問題があった。また、バスバーの断面積を拡大する場合、大電力の電流を流すことを想定すると装置の大型化だけではなく、重量増につながる問題があった。また、バスバーの断面積を拡大できたとしても、バスバー自体のコストが非常に高価になる為、装置全体のコストアップにつながる問題がある。また、バスバーとの接続部品、例えば半導体素子においては、発熱した半導体素子の熱をバスバーで受熱することにより、バスバー自体の発熱による温度上昇に加えて、受熱した熱によりバスバーの温度がさらに上昇するといった問題があった。
一方で、今日Ｓｉからなる半導体の高温化対応や、ＳｉＣ（シリコンカーバイト）等の開発により、大電力半導体素子はより高温域で使用される傾向にあり、半導体素子に繋がるバスバーも半導体素子から受け取る熱も当然大きくなる傾向になる。しかし、半導体素子と繋がるバスバーの反対側に受熱を抑制したい部品、例えばフィルムコンデンサやコネクタ等と繋がる場合があるため、バスバーの温度上昇を抑制し、コンデンサやコネクタ等の受熱を最小限に抑える必要がある。
また、大電力の電力変換装置例えば、インバータにおいては、スイッチング半導体素子と平滑コンデンサの２部品をバスバーで接続する必要がある。接続する為のバスバーの距離が長くなると、ＥＳＬ（等価直列インダクタンス）が増大し、スイッチング半導体素子のスイッチング時に大きなサージ電圧が発生する。スイッチング半導体素子の許容電圧を超えるサージ電圧が発生し、発生したサージ電圧がスイッチング半導体素子に流れると、スイッチング半導体素子の破損につながる。また、サージ電圧が大きいと、放射ノイズ、伝導ノイズの増大にもつながる。上記により、バスバーの長さを最小化し、尚且つ、大電流を流すことが可能なように、確実に平滑コンデンサとスイッチング半導体素子を接続する必要がある。 In the conventional connection conductor cooling device as described above, in an application in which a large current is passed by a method of expanding the surface area by installing fins on the bus bar, a very large space is required, which leads to an increase in the size of the entire device. There was a problem. Even if a large fin can be installed, if the heat of the bus bar is radiated to the air, the heat transfer coefficient is limited, so the heat of the generated bus bar is not transmitted to the tip of the fin, and the expected heat dissipation effect cannot be obtained. There was a problem. In addition, when enlarging the cross-sectional area of the bus bar, there is a problem that not only increases the size of the apparatus but also increases the weight when it is assumed that a high-power current flows. Further, even if the cross-sectional area of the bus bar can be enlarged, the cost of the bus bar itself becomes very expensive, and there is a problem that leads to an increase in the cost of the entire apparatus. In addition, in a connection part to the bus bar, for example, a semiconductor element, the heat of the generated semiconductor element is received by the bus bar, so that the temperature of the bus bar further increases due to the received heat in addition to the temperature increase due to the heat generation of the bus bar itself. There was a problem.
On the other hand, high power semiconductor elements tend to be used at higher temperatures due to the high temperature of semiconductors made of Si today and the development of SiC (silicon carbide), and the bus bars connected to the semiconductor elements are also from the semiconductor elements. Naturally, the received heat tends to increase. However, it may be connected to the part that wants to suppress heat reception on the opposite side of the bus bar connected to the semiconductor element, such as a film capacitor or connector, so it is necessary to suppress the temperature rise of the bus bar and minimize heat reception of the capacitor or connector etc. There is.
Further, in a high-power power conversion device, for example, an inverter, it is necessary to connect two parts of a switching semiconductor element and a smoothing capacitor with a bus bar. When the distance between the bus bars for connection increases, ESL (equivalent series inductance) increases, and a large surge voltage is generated when the switching semiconductor element is switched. When a surge voltage exceeding the allowable voltage of the switching semiconductor element is generated and the generated surge voltage flows to the switching semiconductor element, the switching semiconductor element is damaged. In addition, a large surge voltage leads to an increase in radiation noise and conduction noise. As described above, it is necessary to securely connect the smoothing capacitor and the switching semiconductor element so as to minimize the length of the bus bar and allow a large current to flow.

この発明は上記のような課題を解消するためになされたものであり、半導体素子等の電気装置からの受熱及び接続導体自体の発熱によって温度上昇したバスバー等の接続導体を効率的に冷却することができ、しかも小型で接続導体の長さを短縮することができる接続導体の冷却装置、及びその接続導体の冷却装置を用いた電力変換装置を提供することを目的としている。   The present invention has been made to solve the above-described problems, and efficiently cools a connection conductor such as a bus bar whose temperature has risen due to heat received from an electric device such as a semiconductor element and heat generated by the connection conductor itself. An object of the present invention is to provide a cooling device for a connection conductor that can be reduced in size and that can shorten the length of the connection conductor, and a power converter using the cooling device for the connection conductor.

この発明に係る接続導体の冷却装置は、第１の電気装置から導出され第１の接続部を有する第１の接続導体と、冷却器と、前記冷却器と前記第１の接続部との間に設けられ前記第１の接続導体の熱を前記冷却器に伝える伝熱体と、前記伝熱体と前記冷却器との間及び前記伝熱体と前記第１の接続導体との間の何れか一方に介装された電気絶縁性伝熱材と、を備えたことを特徴とするものである。
また、この発明に係る接続導体の冷却装置を用いた電力変換装置は、第１の電気装置から導出され第１の接続部を有する第１の接続導体と、冷却器と、前記冷却器と前記第１の接続部との間に設けられ前記第１の接続導体の熱を前記冷却器に伝える伝熱体と、前記伝熱体と前記冷却器との間及び前記伝熱体と前記第１の接続導体との間の何れか一方に介装された電気絶縁性伝熱材と、を有する接続導体の冷却装置を備えると共に、第２の電気装置から導出され、前記第１の接続導体の第１の接続部に接続された第２の接続部を有する第２の接続導体を備え、前記第１の電気装置がスイッチング半導体素子からなり、前記第２の電気装置がコンデンサからなることを特徴とするものである。 A cooling device for a connection conductor according to the present invention includes a first connection conductor derived from a first electrical device and having a first connection portion, a cooler, and between the cooler and the first connection portion. Any one of a heat transfer body that is provided on the heat transfer body and transfers heat of the first connection conductor to the cooler, between the heat transfer body and the cooler, and between the heat transfer body and the first connection conductor. And an electrically insulative heat transfer material interposed therebetween.
In addition, a power converter using the connection conductor cooling device according to the present invention includes a first connection conductor derived from the first electric device and having a first connection portion, a cooler, the cooler, and the cooler. A heat transfer body provided between the first connection portion and transferring heat of the first connection conductor to the cooler; between the heat transfer body and the cooler; and the heat transfer body and the first An electrical insulating heat transfer material interposed between any one of the connection conductors, and a cooling device for the connection conductor. A second connecting conductor having a second connecting portion connected to the first connecting portion is provided, wherein the first electric device is made of a switching semiconductor element, and the second electric device is made of a capacitor. It is what.

この発明に係る接続導体の冷却装置によれば、電気装置から例えばバスバーなどの接続導体に伝わる熱、さらにそれに加えて接続導体自体で発生する熱は、第１の接続部から伝熱体と電気絶縁性伝熱材を介して冷却器に固体の熱伝導によって伝達され、冷却器で冷却するので、効率的に冷却することができ、しかも前記接続導体の長さと熱の伝達経路を短くすることで、冷却効率の向上及び小型化を図ることができる。
また、この発明に係る前記接続導体の冷却装置を用いた電力変換装置によれば、スイッチング半導体素子から発生して第１の接続導体に伝わる熱、及び第１の接続導体自体で発生する熱が第１の接続部から伝熱体と電気絶縁性伝熱材を介して冷却器に固体熱伝導によって伝達されて冷却器で冷却されるので、発生する熱を効率的に冷却することができる。また、各接続導体の長さと熱の伝達経路を短くすることが簡単にできるので、冷却効率の向上及び小型化、等価直列インダクタンス等の電気特性の改善を図ることが容易である。 According to the cooling device for a connection conductor according to the present invention, heat transmitted from the electrical device to the connection conductor such as a bus bar, and in addition to this, heat generated in the connection conductor itself is transmitted from the first connection portion to the heat transfer body and the electrical conductor. It is transmitted to the cooler via the insulating heat transfer material by solid heat conduction and cooled by the cooler, so that it can be efficiently cooled, and the length of the connecting conductor and the heat transfer path are shortened. Thus, the cooling efficiency can be improved and the size can be reduced.
Moreover, according to the power converter using the cooling device for a connection conductor according to the present invention, heat generated from the switching semiconductor element and transmitted to the first connection conductor and heat generated by the first connection conductor itself are generated. Since it is transmitted by the solid heat conduction from the first connecting portion to the cooler via the heat transfer body and the electrically insulating heat transfer material and cooled by the cooler, the generated heat can be efficiently cooled. In addition, since the length of each connection conductor and the heat transfer path can be easily shortened, it is easy to improve the cooling characteristics, reduce the size, and improve the electrical characteristics such as the equivalent series inductance.

この発明の実施の形態１による接続導体の冷却装置及びその接続導体の冷却装置を用いた車載用電力変換装置の要部を示す斜視図である。It is a perspective view which shows the principal part of the vehicle-mounted power converter device using the cooling device of the connection conductor by Embodiment 1 of this invention and the cooling device of the connection conductor. 図１に示された接続導体の冷却装置の部分を詳細に示す縦断面図である。It is a longitudinal cross-sectional view which shows the part of the cooling device of the connection conductor shown by FIG. 1 in detail. 図２に示された接続導体の冷却装置の部分を詳細に示す分解斜視図である。It is a disassembled perspective view which shows the part of the cooling device of the connection conductor shown by FIG. 2 in detail.

実施の形態１．
図１はこの発明の実施の形態１による接続導体の冷却装置及びその接続導体の冷却装置を用いた車載用電力変換装置の要部を示す斜視図、図２は図１に示された接続導体の冷却装置の部分を詳細に示す縦断面図、図３は図２に示された接続導体の冷却装置の部分を詳細に示す分解斜視図である。図において、接続導体の冷却装置は、例えばインバータなどの電力変換装置に用いられるＳｉＣ半導体素子などを用いた第１の電気装置であるスイッチング半導体素子１から導出されて第１の接続部２ａを有し放熱を要する第１の接続導体であるバスバー２と、一端部３ａが電気絶縁性伝熱材４を介してアルミダイキャストからなる冷却器５に密着され、他端部３ｂが第１の接続部２ａに結合された伝熱体３とを備えて成っている。なお、冷却器５の形態は特に限定されるものではなく、例えば車載用電力変換装置を構成する筐体の一部であっても良いし、その筐体とは別途用意されたヒートシンク、あるいはヒートパイプと放熱手段を用いたもの、液体などの流体を放熱器との間で循環させて冷却するものなど、公知の技術を適宜選択して用いることができる。 Embodiment 1 FIG.
1 is a perspective view showing a main part of a cooling device for a connection conductor and a vehicle-mounted power converter using the cooling device for the connection conductor according to Embodiment 1 of the present invention, and FIG. 2 is a connection conductor shown in FIG. FIG. 3 is an exploded perspective view showing in detail a cooling device portion of the connection conductor shown in FIG. 2. In the figure, the cooling device for the connection conductor is derived from the switching semiconductor element 1 which is a first electric device using, for example, an SiC semiconductor element used in a power conversion device such as an inverter, and has a first connection portion 2a. The bus bar 2 that is the first connection conductor that requires heat dissipation and the one end 3a are in close contact with the cooler 5 made of aluminum die cast through the electrically insulating heat transfer material 4, and the other end 3b is the first connection. And a heat transfer body 3 coupled to the portion 2a. The form of the cooler 5 is not particularly limited. For example, the cooler 5 may be a part of a casing constituting the in-vehicle power conversion device, or a heat sink or heat prepared separately from the casing. Known techniques such as those using pipes and heat radiating means, and those in which a fluid such as a liquid is circulated between the heat radiator and cooled can be appropriately selected and used.

電気絶縁性伝熱材４はバスバー２と冷却器５の間の電気的絶縁と放熱の為に設けられるものであり、この例では、弾性のある絶縁放熱部材を用いているが、これに限定されるものではない。例えば、伝熱体３と冷却器５が接触する箇所にテープ状やシート状の絶縁樹脂膜によって電気絶縁性伝熱材４を形成するなど、公知の代替方法を採用してもよい。また、電気絶縁性伝熱材４の設置位置は、伝熱体３の他端部３ｂ（図の上端部）とバスバー２の間としてもよい。また、その際は、伝熱体３と冷却器５の間に周知の熱伝導性を向上させたグリス等の伝熱材や公差吸収の部材等を追加しても良い。また、電気絶縁性伝熱材４として、電気絶縁性を備えた絶縁樹脂膜を用い、放熱性のあるグリスをその絶縁樹脂膜と冷却器５の間に塗布しても良い。   The electrically insulating heat transfer material 4 is provided for electrical insulation and heat dissipation between the bus bar 2 and the cooler 5, and in this example, an elastic insulating heat dissipation member is used. Is not to be done. For example, a known alternative method such as forming the electrically insulating heat transfer material 4 with a tape-like or sheet-like insulating resin film at a place where the heat transfer body 3 and the cooler 5 come into contact may be employed. Moreover, the installation position of the electrically insulating heat transfer material 4 may be between the other end 3 b (upper end in the drawing) of the heat transfer body 3 and the bus bar 2. In this case, a heat transfer material such as grease with improved heat conductivity, a tolerance absorbing member, or the like may be added between the heat transfer body 3 and the cooler 5. Alternatively, an insulating resin film having electrical insulation may be used as the electrically insulating heat transfer material 4, and heat-radiating grease may be applied between the insulating resin film and the cooler 5.

なお、図１〜図３に示す実施の形態１は、接続導体の冷却装置と共にその接続導体の冷却装置を用いた車載用電力変換装置の要部を示しており、その車載用電力変換装置は、具体的にはインバータであり、第２の電気装置である平滑用のコンデンサ６から導出され、第１の接続導体であるバスバー２の第１の接続部２ａに接続された第２の接続部７ａを有する第２の接続導体であるバスバー７を備えている。第１の接続部２ａと第２の接続部７ａは後述する締結具８１を構成するボルト８１Ｂを挿通するための挿通穴を用いて構成されている。そして、この実施の形態１の例では、接続導体の冷却装置には、第１の接続部２ａと第２の接続部７ａを締結具８１によって固定する接続固定部８ａが上面部に設けられた端子台８を備え、端子台８は、その背面部８ｂによって伝熱体３の冷却器５側の一端部３ａを電気絶縁性伝熱材４を介して冷却器５に密着するように冷却器５の表面に設けられたボス５ａにボルト５ｂによって固定されている。   In addition, Embodiment 1 shown in FIGS. 1 to 3 shows a main part of an in-vehicle power conversion device using the connection conductor cooling device together with the connection conductor cooling device. Specifically, the second connection portion which is an inverter and is derived from the smoothing capacitor 6 which is the second electric device and connected to the first connection portion 2a of the bus bar 2 which is the first connection conductor. A bus bar 7 as a second connecting conductor having 7a is provided. The 1st connection part 2a and the 2nd connection part 7a are comprised using the penetration hole for inserting the volt | bolt 81B which comprises the fastener 81 mentioned later. And in the example of this Embodiment 1, the connection fixing part 8a which fixes the 1st connection part 2a and the 2nd connection part 7a with the fastener 81 was provided in the upper surface part in the cooling device of the connection conductor. A terminal block 8 is provided, and the terminal block 8 has a cooler so that one end 3a of the heat transfer body 3 on the cooler 5 side is in close contact with the cooler 5 via the electrically insulating heat transfer material 4 by the back surface portion 8b. 5 is fixed to a boss 5a provided on the surface of 5 by bolts 5b.

端子台８は、絶縁樹脂によって成形され、締結具８１の一方を構成するナット８１Ａを収容、保持する六角形の穴８ｃ（図３に図示）が設けられた基体８０を有し、その基体８０の一側面部には溝８０ａ（図２に図示）が形成されている。なお、溝８０ａは凹所としても良い。また、バスバー２とバスバー７は互いに対向されて２本ずつ設けられ、接続固定部８ａ及び伝熱体３もバスバー２とバスバー７に対応して所定間隙で２か所に設けられているが、バスバーの本数や接続固定部８ａの数は１以上であれば特に限定されるものではない。また、伝熱体３はバスバー２と同様の材質、例えば銅、アルミニウム、それらの合金類等、電気と熱の良導体からなっている。   The terminal block 8 includes a base body 80 that is formed of an insulating resin and is provided with a hexagonal hole 8c (shown in FIG. 3) that accommodates and holds a nut 81A that constitutes one of the fasteners 81. A groove 80a (illustrated in FIG. 2) is formed on one side surface portion. The groove 80a may be a recess. In addition, the bus bar 2 and the bus bar 7 are provided two by two so as to face each other, and the connection fixing portion 8a and the heat transfer body 3 are also provided at two locations with a predetermined gap corresponding to the bus bar 2 and the bus bar 7, The number of bus bars and the number of connection fixing portions 8a are not particularly limited as long as they are one or more. The heat transfer body 3 is made of the same material as the bus bar 2, for example, a good conductor of electricity and heat, such as copper, aluminum, and alloys thereof.

そして、その伝熱体３は、端子台８の接続固定部８ａの上面部、一側面部、及び背面部８ｂ（図２に図示）の３方部を囲む如く略コ字状に形成され、さらに、冷却器５側の一端部３ａと第１の接続部２ａ側の他端部３ｂとの間の中間部分には、公差範囲内におけるバラツキなどによる寸法の変化を吸収し得るように、略「く」字形状に屈曲形成された弾性変形部３ｃが形成されている。基体８０に設けられた溝８０ａは、その弾性変形部３ｃの突出部分を受け入れると共に、寸法の変化を吸収できるように構成されている。なお、伝熱体３の他端部３ｂにはナット８１Ａを挿通するための挿通穴が設けられている。   The heat transfer body 3 is formed in a substantially U shape so as to surround the three sides of the upper surface portion, one side surface portion, and the rear surface portion 8b (shown in FIG. 2) of the connection fixing portion 8a of the terminal block 8. Further, an intermediate portion between the one end portion 3a on the cooler 5 side and the other end portion 3b on the first connection portion 2a side is substantially arranged so as to absorb a change in dimensions due to variations within a tolerance range. An elastically deformable portion 3 c that is bent in a “<” shape is formed. The groove 80a provided in the base body 80 is configured to receive the protruding portion of the elastically deforming portion 3c and absorb the change in dimensions. The other end 3b of the heat transfer body 3 is provided with an insertion hole for inserting the nut 81A.

次に、組立順に説明する。端子台８は、予めナット８１Ａを基体８０の六角形の穴８ｃに挿入し、その後、コ字状の伝熱体３を図３の紙面の左側から斜め右下側方向にスライドさせて基体８０に装着しておく。伝熱体３を基体８０に装着したとき、図２に示すように、伝熱体３の一端部３ａは、基体８０の下面である背面部８ｂよりも下方向に突出し、他端部３ｂはナット８１Ａの上面を覆うように接続固定部８ａに位置し、弾性変形部３ｃが基体８０の一側面部に形成された溝８０ａに進入した状態となる。なお、弾性変形部３ｃの形状などは図示のものに限定されず、例えば円弧状に形成し、あるいは突出方向を逆にしても良い。弾性変形部３ｃの突出方向を逆にした場合、溝８０ａに相当する部分を凸部によって形成し、あるいはその溝や凸部を設けなくても良い。   Next, the assembly order will be described. In the terminal block 8, a nut 81A is previously inserted into the hexagonal hole 8c of the base body 80, and then the U-shaped heat transfer body 3 is slid obliquely from the left side of the sheet of FIG. Put it on. When the heat transfer body 3 is attached to the base body 80, as shown in FIG. 2, one end portion 3a of the heat transfer body 3 protrudes downward from the back surface portion 8b which is the lower surface of the base body 80, and the other end portion 3b is The elastic deformation portion 3 c is located in the connection fixing portion 8 a so as to cover the upper surface of the nut 81 </ b> A, and enters the groove 80 a formed in one side surface portion of the base body 80. In addition, the shape of the elastic deformation part 3c etc. is not limited to the thing of illustration, For example, you may form in circular arc shape or you may make a protrusion direction reverse. When the protruding direction of the elastic deformation portion 3c is reversed, a portion corresponding to the groove 80a is formed by a convex portion, or the groove or the convex portion may not be provided.

なお、伝熱体３の一端部３ａ（冷却器５側の下面部）は、端子台８を冷却器５のボス５ａに対してボルト５ｂで固定したときに、端子台８の背面部８ｂによって電気絶縁性伝熱材４を介して冷却器５に密着されるように構成されている。
次に、バスバー２の第１の接続部２ａとバスバー７の第２の接続部７ａを図２に示すように、端子台８の接続固定部８ａを構成するナット８１Ａの上部に先に取り付けられた伝熱体３の他端部３ｂの上に左右から互い違いに突き合わせる如く配置して、互いの挿通穴の中心がナット８１Ａのネジ穴と大凡合致するようにしてスイッチング半導体素子１及びコンデンサ６の位置を固定する。 One end 3a (the lower surface portion on the cooler 5 side) of the heat transfer body 3 is formed by the back surface portion 8b of the terminal block 8 when the terminal block 8 is fixed to the boss 5a of the cooler 5 with the bolt 5b. It is configured to be in close contact with the cooler 5 through the electrically insulating heat transfer material 4.
Next, the first connection portion 2a of the bus bar 2 and the second connection portion 7a of the bus bar 7 are first attached to the top of the nut 81A constituting the connection fixing portion 8a of the terminal block 8, as shown in FIG. The switching semiconductor element 1 and the capacitor 6 are disposed on the other end portion 3b of the heat transfer body 3 so as to abut against each other from the left and right sides so that the centers of the insertion holes substantially coincide with the screw holes of the nut 81A. The position of is fixed.

このとき、即ちボルト８１Ｂで締結する前の状態では、伝熱体３と第１の接続部２ａとの間、または第２の接続部７ａとの間は、寸法の公差内のバラツキを吸収するための空隙部Ｇが形成される寸法関係で各部材が成形されている。
次に締結具８１を構成するボルト８１Ｂによって、第１の接続部２ａ、第２の接続部７ａ、及び伝熱体３をナット８１Ａに共締め固定する。
なお、冷却器５に設けられたボス５ａのネジ穴、及び端子台８に設けられたナット８１Ａのネジ穴は、ボルト５ｂやボルト８１Ｂを締め付けたときに発生するおそれがある金属片をネジ穴部の外に出さないよう、何れも袋穴形状となっている。 At this time, that is, in a state before being fastened with the bolt 81B, the variation within the dimensional tolerance is absorbed between the heat transfer body 3 and the first connection portion 2a or between the second connection portion 7a. Therefore, each member is formed in a dimensional relationship in which a gap portion G is formed.
Next, the first connecting portion 2a, the second connecting portion 7a, and the heat transfer body 3 are fastened and fixed to the nut 81A by a bolt 81B constituting the fastener 81.
In addition, the screw hole of the boss 5a provided in the cooler 5 and the screw hole of the nut 81A provided in the terminal block 8 are screw holes for metal pieces that may be generated when the bolt 5b or the bolt 81B is tightened. Each of them has a bag hole shape so as not to come out of the part.

上記のように、実施の形態１に係る接続導体の冷却装置は、第１の電気装置としてのスイッチング半導体素子１から導出された放熱を要する第１の接続部２ａを有する第１の接続導体としてのバスバー２と、熱を受熱・吸収するアルミダイキャストからなる冷却器５と、この冷却器５と第１の接続部２ａとの間に電気絶縁性伝熱材４を介して設けられ、バスバー２の熱を冷却器５に伝える略コ字状に形成された伝熱体３と、を備えるように構成されたものである。   As described above, the cooling device for the connection conductor according to the first embodiment is the first connection conductor having the first connection portion 2a that requires heat radiation and is derived from the switching semiconductor element 1 as the first electric device. The bus bar 2, the cooler 5 made of aluminum die-casting that receives and absorbs heat, and the electrically conductive heat transfer material 4 are provided between the cooler 5 and the first connection portion 2 a, And a heat transfer body 3 formed in a substantially U-shape that transfers the heat of 2 to the cooler 5.

上記実施の形態１に係る接続導体の冷却装置によれば、スイッチング半導体素子１からバスバー２に伝わる熱、さらにそれに加えてバスバー２自体で発生する熱は、第１の接続部２ａから伝熱体３と電気絶縁性伝熱材４を介して冷却器５に固体の熱伝導によって伝達され、冷却器５で冷却されるので、構造が簡素で、効率的に冷却することができる。図に示すようにバスバー２の第１の接続部２ａまでの長さや、第１の接続部２ａから冷却器５に至る熱の伝達経路となる伝熱体３の長さは、短くすることが容易に可能であるので、バスバー２の長さを延長させることなく、バスバー２の冷却を最小限のスペースで実現でき、冷却効率の向上を図ることが簡単である。また、バスバー２の第１の接続部２ａまでの長さを最短にすることで、冷却効率の向上及び小型化を図ることができる。   According to the cooling device for a connection conductor according to the first embodiment, the heat transferred from the switching semiconductor element 1 to the bus bar 2 and further the heat generated in the bus bar 2 itself are transferred from the first connection portion 2a to the heat transfer body. 3 and the electrically insulating heat transfer material 4 are transmitted to the cooler 5 by solid heat conduction and cooled by the cooler 5, so that the structure is simple and can be efficiently cooled. As shown in the figure, the length of the bus bar 2 up to the first connection portion 2a and the length of the heat transfer body 3 serving as a heat transfer path from the first connection portion 2a to the cooler 5 can be shortened. Since it is possible easily, the bus bar 2 can be cooled in a minimum space without extending the length of the bus bar 2, and it is easy to improve the cooling efficiency. Further, by shortening the length of the bus bar 2 to the first connection portion 2a, the cooling efficiency can be improved and the size can be reduced.

また、伝熱体３と発熱するバスバー２との間に、締結前では空隙部Ｇが形成されるようにし、さらに、伝熱体３にバネ構造の弾性変形部３ｃを形成したことで、公差バラツキにより、伝熱体３と発熱するバスバー間の距離が変化したとしても、発熱するバスバーに余計な力を加えることなく、発熱するバスバーと伝熱体３を締結できる為、バスバーに余計な力を加えたくない場合、例えばコンデンサに繋がるバスバーで、バスバーがポッティングなどで覆われている場合、発熱するバスバーと伝熱体３の締結時、バスバーに掛る力によってポッティング材にクラックが入ることを防ぐことができる。   Further, a gap G is formed between the heat transfer body 3 and the heat generating bus bar 2 before fastening, and further, an elastically deformable portion 3c having a spring structure is formed on the heat transfer body 3, so that the tolerance is increased. Even if the distance between the heat transfer body 3 and the heat generating bus bar changes due to variations, the heat generating bus bar and the heat transfer body 3 can be fastened without applying an extra force to the heat generating bus bar. If, for example, the bus bar connected to the capacitor is covered with potting, the potting material is prevented from cracking due to the force applied to the bus bar when the heat generating bus bar and the heat transfer body 3 are fastened. be able to.

また、伝熱体３の下に絶縁と放熱の為、弾性がある電気絶縁性伝熱材４を用いたことで、伝熱体３の厚みがばらついたとしても、電気絶縁性伝熱材４でバラツキを吸収し、冷却器５と密着させることができる。
また、第１の接続部２ａをボルト８１Ｂによって締結する場合、オネジとメネジがこすれることで金属片が発生し、発生した金属片が電極間に付着してショートを起す恐れがあるが、金属片をナット８１Ａのネジ穴側から外側に出にくい袋穴形状としたことで、ショートする恐れを無くすことができる。 Moreover, even if the thickness of the heat transfer body 3 varies due to the use of the electrically insulating heat transfer material 4 having elasticity for insulation and heat dissipation under the heat transfer body 3, the electric insulation heat transfer material 4 Therefore, the variation can be absorbed and brought into close contact with the cooler 5.
Further, when the first connecting portion 2a is fastened by the bolt 81B, a metal piece is generated by rubbing the male screw and the female screw, and the generated metal piece may adhere between the electrodes and cause a short circuit. Is formed into a bag hole shape that hardly protrudes from the screw hole side of the nut 81 </ b> A, thereby eliminating the possibility of short-circuiting.

また、上記のように実施の形態１に係る電力変換装置は、上記接続導体の冷却装置を備えると共に、第２の電気装置である平滑用のコンデンサ６から導出されて、第１の接続導体であるバスバー２の第１の接続部２ａに接続された第２の接続部７ａを有する第２の接続導体であるバスバー７を備えたインバータに適用するようにしたものである。   Further, as described above, the power conversion device according to Embodiment 1 includes the cooling device for the connection conductor, and is derived from the smoothing capacitor 6 that is the second electrical device, and is connected to the first connection conductor. The present invention is applied to an inverter having a bus bar 7 as a second connection conductor having a second connection portion 7a connected to a first connection portion 2a of a certain bus bar 2.

上記実施の形態１に係る電力変換装置によれば、スイッチング半導体素子１と平滑用のコンデンサ６間のバスバー２と、バスバー６を最短で繋げるようにできるため、等価直列インダクタンスが減少してサージ電圧を低減することができ、スイッチング半導体素子１の破損防止と放射ノイズ及び、伝導ノイズ増大を防ぐことができる。また、スイッチング半導体素子１から発生してバスバー２に伝わる熱、及びバスバー２自体で発生する熱が第１の接続部２ａから伝熱体３と電気絶縁性伝熱材４を介して冷却器５に固体熱伝導によって伝達されて冷却器５で冷却される一方、熱の一部はバスバー７を通じてコンデンサ６に伝達されるので、発生する熱を効率的に冷却することができる。このため、車載用途にも好ましく用いることができる。   According to the power conversion device according to the first embodiment, since the bus bar 2 between the switching semiconductor element 1 and the smoothing capacitor 6 and the bus bar 6 can be connected in the shortest time, the equivalent series inductance is reduced and the surge voltage is reduced. The switching semiconductor element 1 can be prevented from being damaged and radiation noise and conduction noise can be prevented from increasing. In addition, the heat generated from the switching semiconductor element 1 and transmitted to the bus bar 2 and the heat generated in the bus bar 2 itself from the first connecting portion 2 a through the heat transfer body 3 and the electrically insulating heat transfer material 4 are cooled by the cooler 5. While being transmitted by solid heat conduction and cooled by the cooler 5, a part of the heat is transmitted to the capacitor 6 through the bus bar 7, so that the generated heat can be efficiently cooled. For this reason, it can be preferably used for in-vehicle use.

なお、第１の電気装置がスイッチング半導体素子１である場合について説明したが、これに限定されるものではなく、発熱する部分を接続導体を介して放熱する電気装置であれば同様に適用することができる。また、第２の電気装置がコンデンサ６の場合を例に説明したが、これに限定されるものではなく、第１の電気装置に接続導体を介して接続して用いる電気装置であれば特に制限なく用いることができる。
また、締結具８１としてナット８１Ａとボルト８１Ｂを用い、端子台８の固定にボルト５ｂを用いたがこれに限定されるものではない。例えば、プッシュリベットで固定する手法などを採用してもよい。また、溶接等により接続してもよい。 In addition, although the case where the first electric device is the switching semiconductor element 1 has been described, the present invention is not limited to this, and the same applies to any electric device that radiates a heat-generating portion through a connection conductor. Can do. Further, the case where the second electric device is the capacitor 6 has been described as an example. However, the present invention is not limited to this, and is not particularly limited as long as the electric device is connected to the first electric device via a connection conductor. Can be used.
Moreover, although the nut 81A and the volt | bolt 81B were used as the fastener 81 and the volt | bolt 5b was used for fixation of the terminal block 8, it is not limited to this. For example, a technique of fixing with push rivets may be employed. Moreover, you may connect by welding etc.

また、伝熱体３とバスバー２、バスバー７は別部品によって構成したが、これに限定されるものではなく、例えば伝熱体３と、バスバー２及びバスバー７の何れか一方、もしくは双方を一体としてもよい。
さらに、伝熱体３とナット８１Ａは別部品によって構成したが、これに限定されるものではなく、例えば、ナット８１Ａを袋ナットにし、その袋ナットを伝熱体３と溶接等で固定して一体化しても良い。あるいはまた、伝熱体３の他端部３ｂのボルト挿入用の挿通穴を開けずに、絞り加工で袋穴形状にし、その袋穴にタップを切って、伝熱体３の他端部３ｂ側に袋ナットを一体的に設け、バスバー２、バスバー７を伝熱体３の袋ナット部分にボルトで締結するようにしてもよい。何れの場合も、部品点数が削減されて組立が容易になると共に、作業性が改善され安価にできるなどの効果が期待できる。 In addition, the heat transfer body 3 and the bus bar 2 and the bus bar 7 are configured as separate parts. However, the present invention is not limited to this. For example, the heat transfer body 3 and one or both of the bus bar 2 and the bus bar 7 are integrated. It is good.
Further, the heat transfer body 3 and the nut 81A are configured as separate parts, but the present invention is not limited to this. For example, the nut 81A is a cap nut, and the cap nut is fixed to the heat transfer body 3 by welding or the like. It may be integrated. Alternatively, the other end 3b of the heat transfer body 3 is formed by forming a bag hole shape by drawing without opening a through hole for inserting a bolt in the other end 3b of the heat transfer body 3, and cutting the tap into the bag hole. A cap nut may be integrally provided on the side, and the bus bar 2 and the bus bar 7 may be fastened to the cap nut portion of the heat transfer body 3 with bolts. In either case, the number of parts can be reduced to facilitate assembly, and the workability can be improved and the cost can be reduced.

また、端子台８と、ボス５ａ、ボルト５ｂを用いずに、第１の接続部２ａ、第２の接続部７ａ、及び伝熱体３の他端部３ｂを締結し、伝熱体３の一端部３ａを公知の他の手段で冷却器５に電気絶縁性伝熱材４を介して密着させるようにしてもよい。
なお、冷却器５としてアルミダイキャストを採用したが、これに限定されるものではない。例えば、フィンを設置し、冷却性能をあげてもよい。または、冷却器内部に流路を設置し、気体または液体の冷媒を通流して冷却するなど公知の代替方法を採用してもよい。
また、基体８０を樹脂モールド品によって構成したが、これに限定されるものではない。例えば、基体８０自体にバネ性を持たせ、冷却器５のボス５ａとの間にクリアランスを設け、ボルト５ｂを締付けることで、電気絶縁性伝熱材４に常に潰し力が掛る構造にしてもよい。
その他、この発明の範囲内で種々の変形や変更が可能であることは言うまでもない。 Further, without using the terminal block 8, the boss 5a, and the bolt 5b, the first connection portion 2a, the second connection portion 7a, and the other end portion 3b of the heat transfer body 3 are fastened. The one end 3a may be brought into close contact with the cooler 5 via the electrically insulating heat transfer material 4 by other known means.
In addition, although the aluminum die casting was employ | adopted as the cooler 5, it is not limited to this. For example, a fin may be installed to improve the cooling performance. Alternatively, a known alternative method such as installing a flow path inside the cooler and cooling it by passing a gas or liquid refrigerant may be adopted.
Moreover, although the base | substrate 80 was comprised with the resin mold product, it is not limited to this. For example, the base 80 itself has a spring property, a clearance is provided between the boss 5a of the cooler 5 and a bolt 5b is tightened so that a crushing force is always applied to the electrically insulating heat transfer material 4. Good.
It goes without saying that various modifications and changes are possible within the scope of the present invention.

１ スイッチング半導体素子（第１の電気装置）、２ バスバー（第１の接続導体）、２ａ 第１の接続部、３ 伝熱体、３ａ 一端部、３ｂ 他端部、３ｃ 弾性変形部、４ 電気絶縁性伝熱材、５ 冷却器、５ａ ボス、５ｂ ボルト、６ コンデンサ（第２の電気装置）、７ バスバー（第２の接続導体）、７ａ 第２の接続部、８ 端子台、８ａ 接続固定部、８ｂ 背面部、８ｃ 穴、８０ 基体、８０ａ 溝、８１ 締結具、８１Ａ ナット、８１Ｂ ボルト、Ｇ 空隙部。   DESCRIPTION OF SYMBOLS 1 Switching semiconductor element (1st electric apparatus), 2 Busbar (1st connection conductor), 2a 1st connection part, 3 heat exchanger, 3a one end part, 3b other end part, 3c elastic deformation part, 4 electricity Insulating heat transfer material, 5 cooler, 5a boss, 5b bolt, 6 capacitor (second electrical device), 7 bus bar (second connection conductor), 7a second connection, 8 terminal block, 8a connection fixing Part, 8b back surface part, 8c hole, 80 base, 80a groove, 81 fastener, 81A nut, 81B bolt, G space part.

この発明に係る接続導体の冷却装置は、第１の電気装置から導出された放熱を要する第１の接続部を有する第１の接続導体と、冷却器と、前記冷却器と前記第１の接続部との間に設けられ前記第１の接続導体の熱を前記冷却器に伝える伝熱体と、前記伝熱体と前記冷却器との間及び前記伝熱体と前記第１の接続導体との間の何れか一方に介装された電気絶縁性伝熱材と、を備え、前記第１の接続部と前記伝熱体における前記第１の接続部の側の端部とは、締結具によって固定されているものであって、前記伝熱体における前記第１の接続部側の端部には、絞り加工によって一体形成された袋ナット部が設けられ、前記第１の接続部はボルトによって前記袋ナット部に締結されていることを特徴とするものである。
また、この発明に係る接続導体の冷却装置を用いた電力変換装置は、第１の電気装置から導出された放熱を要する第１の接続部を有する第１の接続導体と、冷却器と、前記冷却器と前記第１の接続部との間に設けられ前記第１の接続導体の熱を前記冷却器に伝える伝熱体と、前記伝熱体と前記冷却器との間及び前記伝熱体と前記第１の接続導体との間の何れか一方に介装された電気絶縁性伝熱材と、を有し、前記第１の接続部と前記伝熱体における前記第１の接続部の側の端部とは、締結具によって固定されているものであって、前記伝熱体における前記第１の接続部側の端部には、絞り加工によって一体形成された袋ナット部が設けられ、前記第１の接続部はボルトによって前記袋ナット部に締結されている接続導体の冷却装置を備えると共に、第２の電気装置から導出され、前記第１の接続導体の第１の接続部に接続された第２の接続部を有する第２の接続導体を備え、前記第１の電気装置がスイッチング半導体素子からなり、前記第２の電気装置がコンデンサからなることを特徴とするものである。 The cooling device for a connection conductor according to the present invention includes a first connection conductor having a first connection portion derived from the first electric device and requiring heat dissipation, a cooler, the cooler, and the first connection. A heat transfer body that is provided between the heat transfer body and transfers heat of the first connection conductor to the cooler, between the heat transfer body and the cooler, and between the heat transfer body and the first connection conductor. An electrically insulating heat transfer material interposed between the first connection portion and the end of the heat transfer body on the side of the first connection portion is a fastener. A cap nut portion integrally formed by drawing is provided at an end portion of the heat transfer body on the first connection portion side, and the first connection portion is a bolt. And is fastened to the cap nut portion .
Moreover, the power converter using the cooling device for the connection conductor according to the present invention includes a first connection conductor having a first connection portion that requires heat dissipation and is derived from the first electrical device, the cooler, A heat transfer body that is provided between the cooler and the first connection portion and transfers heat of the first connection conductor to the cooler; between the heat transfer body and the cooler; and the heat transfer body An electrically insulating heat transfer material interposed between the first connection conductor and the first connection conductor, and the first connection portion and the first connection portion of the heat transfer body The end portion on the side is fixed by a fastener, and the end portion on the first connection portion side of the heat transfer body is provided with a cap nut portion integrally formed by drawing. the first connecting portion when a cooling device for connecting conductors that are fastened to the cap nut portion by bolts A second connection conductor having a second connection portion derived from the second electric device and connected to the first connection portion of the first connection conductor, wherein the first electric device is switched It is made of a semiconductor element, and the second electric device is made of a capacitor.

この発明に係る接続導体の冷却装置によれば、電気装置から例えばバスバーなどの接続導体に伝わる熱、さらにそれに加えて接続導体自体で発生する熱は、第１の接続部から伝熱体と電気絶縁性伝熱材を介して冷却器に固体の熱伝導よって伝達され、冷却器で冷却するので、効率的に冷却することができ、しかも前記接続導体の長さと熱の伝達経路を短くすることで、冷却効率の向上及び小型化を図ることができる。そして、第１の接続部の熱を冷却器に伝える伝熱体における端部に設けられ絞り加工によって一体形成された袋ナット部に、第１の接続部がボルトによって締結されるようにしたので、部品点数が削減されて組立が容易になると共に、作業性が改善され安価にできるなどの効果が期待できる。
また、この発明に係る前記接続導体の冷却装置を用いた電力変換装置によれば、スイッチング半導体素子から発生して第１の接続導体に伝わる熱、及び第１の接続導体自体で発生する熱が第１の接続部から伝熱体と電気絶縁性伝熱材を介して冷却器に固体熱伝導よって伝達されて冷却器で冷却されるので、発生する熱を効率的に冷却することができる。また、各接続導体の長さと熱の伝達経路を短くすることが簡単にできるので、冷却効率の向上及び小型化、等価直列インダクタンス等の電気特性の改善を図ることが容易である。そして、接続導体の冷却装置について、第１の接続部の熱を冷却器に伝える伝熱体における端部に設けられ絞り加工によって一体形成された袋ナット部に、第１の接続部がボルトによって締結されるようにしたので、部品点数が削減されて組立が容易になると共に、作業性が改善され安価にできるなどの効果が期待できる。

According to the cooling device for a connection conductor according to the present invention, heat transmitted from the electrical device to the connection conductor such as a bus bar, and in addition to this, heat generated in the connection conductor itself is transmitted from the first connection portion to the heat transfer body and the electrical conductor. It is transmitted to the cooler through the heat transfer material through the insulating heat transfer material and cooled by the cooler, so that it can be efficiently cooled, and the length of the connecting conductor and the heat transfer path are shortened. Thus, the cooling efficiency can be improved and the size can be reduced. Since the first connecting portion is fastened by a bolt to the cap nut portion that is provided at the end portion of the heat transfer body that transfers the heat of the first connecting portion to the cooler and is integrally formed by drawing. As a result, the number of parts can be reduced to facilitate assembly, and workability can be improved and the cost can be reduced.
Moreover, according to the power converter using the cooling device for a connection conductor according to the present invention, heat generated from the switching semiconductor element and transmitted to the first connection conductor and heat generated by the first connection conductor itself are generated. Since it is transmitted by solid heat conduction from the first connecting portion to the cooler via the heat transfer body and the electrically insulating heat transfer material and cooled by the cooler, the generated heat can be efficiently cooled. In addition, since the length of each connection conductor and the heat transfer path can be easily shortened, it is easy to improve the cooling characteristics, reduce the size, and improve the electrical characteristics such as the equivalent series inductance. And about the cooling device of a connection conductor, in the end part in the heat exchanger which transmits the heat | fever of a 1st connection part to a cooler, the 1st connection part is bolted to the bag nut part integrally formed by drawing. Since it is fastened, the number of parts can be reduced and the assembly can be facilitated, and the workability can be improved and the cost can be reduced.

Claims (10)

第１の電気装置から導出され第１の接続部を有する第１の接続導体と、冷却器と、前記冷却器と前記第１の接続部との間に設けられ前記第１の接続導体の熱を前記冷却器に伝える伝熱体と、前記伝熱体と前記冷却器との間及び前記伝熱体と前記第１の接続導体との間の何れか一方に介装された電気絶縁性伝熱材と、を備えたことを特徴とする接続導体の冷却装置。   A first connection conductor derived from the first electrical device and having a first connection portion, a cooler, and heat of the first connection conductor provided between the cooler and the first connection portion A heat transfer body that conveys heat to the cooler, and an electrically insulating transfer interposed between the heat transfer body and the cooler or between the heat transfer body and the first connection conductor. A cooling device for a connection conductor, comprising: a heat material. 前記電気絶縁性伝熱材は、電気絶縁性を有する樹脂膜と、伝熱性を有するグリスを用いたものであることを特徴とする請求項１に記載の接続導体の冷却装置。   2. The cooling device for a connection conductor according to claim 1, wherein the electrically insulating heat transfer material uses a resin film having an electrically insulating property and grease having a thermally conductive property. 前記伝熱体は、前記第１の接続部の側の端部と前記冷却器の側の端部との間に、寸法の変化を吸収し得る弾性変形部が形成されていることを特徴とする請求項１または請求項２に記載の接続導体の冷却装置。   The heat transfer body is characterized in that an elastically deformable portion capable of absorbing a change in dimensions is formed between an end portion on the first connection portion side and an end portion on the cooler side. The connection conductor cooling device according to claim 1 or 2. 前記第１の接続部と前記伝熱体における前記第１の接続部の側の端部とは、締結具によって固定されていることを特徴とする請求項１から請求項３の何れかに記載の接続導体の冷却装置。   The said 1st connection part and the edge part by the side of the said 1st connection part in the said heat exchanger are being fixed with the fastener, The Claim 1 characterized by the above-mentioned. Connection conductor cooling device. 前記伝熱体における前記第１の接続部側の端部には、絞り加工によって一体形成された袋ナット部が設けられ、前記第１の接続部はボルトによって前記袋ナット部に締結されていることを特徴とする請求項４に記載の接続導体の冷却装置。   A cap nut portion integrally formed by drawing is provided at an end portion of the heat transfer body on the first connecting portion side, and the first connecting portion is fastened to the cap nut portion by a bolt. The cooling device for a connection conductor according to claim 4. 前記伝熱体と前記第１の接続導体とは一体に形成されていることを特徴とする請求項１から請求項３の何れかに記載の接続導体の冷却装置。   The cooling device for a connection conductor according to any one of claims 1 to 3, wherein the heat transfer body and the first connection conductor are integrally formed. 前記第１の接続部を固定するための接続固定部が上面部に設けられた端子台を備え、前記端子台は、その背面部によって前記伝熱体の前記冷却器側の端部を前記電気絶縁性伝熱材を介して前記冷却器に密着するように前記冷却器に固定されていることを特徴とする請求項１から請求項６の何れかに記載の接続導体の冷却装置。   A connection fixing part for fixing the first connection part is provided with a terminal block provided on an upper surface part, and the terminal block uses the back surface part to connect the end of the heat transfer body on the cooler side with the electric terminal. The connecting conductor cooling device according to any one of claims 1 to 6, wherein the cooling device is fixed to the cooler so as to be in close contact with the cooler via an insulating heat transfer material. 前記伝熱体は、前記端子台の前記接続固定部の上面部、一側面部、及び背面部の３方を包囲する如くコ字形状に形成されていることを特徴とする請求項７に記載の接続導体の冷却装置。   The heat transfer body is formed in a U shape so as to surround three sides of the upper surface portion, one side surface portion, and the rear surface portion of the connection fixing portion of the terminal block. Connection conductor cooling device. 第２の電気装置から導出され、前記第１の接続導体の第１の接続部に接続された第２の接続部を有する第２の接続導体を備えていることを特徴とする請求項１から請求項８の何れかに記載の接続導体の冷却装置。   2. A second connecting conductor having a second connecting portion derived from a second electrical device and connected to the first connecting portion of the first connecting conductor. The cooling device for a connection conductor according to claim 8. 第１の電気装置から導出され第１の接続部を有する第１の接続導体と、冷却器と、前記冷却器と前記第１の接続部との間に設けられ前記第１の接続導体の熱を前記冷却器に伝える伝熱体と、前記伝熱体と前記冷却器との間及び前記伝熱体と前記第１の接続導体との間の何れか一方に介装された電気絶縁性伝熱材と、を有する接続導体の冷却装置を備えると共に、第２の電気装置から導出され、前記第１の接続導体の第１の接続部に接続された第２の接続部を有する第２の接続導体を備え、前記第１の電気装置がスイッチング半導体素子からなり、前記第２の電気装置がコンデンサからなることを特徴とする電力変換装置。   A first connection conductor derived from the first electrical device and having a first connection portion, a cooler, and heat of the first connection conductor provided between the cooler and the first connection portion A heat transfer body that conveys heat to the cooler, and an electrically insulating transfer interposed between the heat transfer body and the cooler or between the heat transfer body and the first connection conductor. And a second conductor having a second connecting portion led out from the second electrical device and connected to the first connecting portion of the first connecting conductor. A power converter comprising a connection conductor, wherein the first electric device is made of a switching semiconductor element, and the second electric device is made of a capacitor.
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