JP2000021604A - Current limiter device - Google Patents
Current limiter deviceInfo
- Publication number
- JP2000021604A JP2000021604A JP10184503A JP18450398A JP2000021604A JP 2000021604 A JP2000021604 A JP 2000021604A JP 10184503 A JP10184503 A JP 10184503A JP 18450398 A JP18450398 A JP 18450398A JP 2000021604 A JP2000021604 A JP 2000021604A
- Authority
- JP
- Japan
- Prior art keywords
- plate
- ptc
- insulating frame
- frame
- polymer plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Thermistors And Varistors (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、例えば過電流保護
回路に用いられ、短絡電流又は大電流(以下、両電流を
総称して短絡電流という)の限流を行う限流素子に関
し、特にその電極間の絶縁破壊を防止する絶縁枠に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current limiting element for use in, for example, an overcurrent protection circuit for limiting a short-circuit current or a large current (hereinafter, both currents are collectively referred to as a short-circuit current). The present invention relates to an insulating frame for preventing dielectric breakdown between electrodes.
【0002】[0002]
【従来の技術】図9は、例えば特開平4−266001
号公報に示された従来の限流素子を示す側断面図であ
る。図中の符号1はPTC特性を有するPTC素子板と
してのPTCポリマー板である。このPTCポリマー板
1は、ポリマー材料とポリマー材料中に分散させた導電
性の粉末材料とを含んだ正の抵抗温度係数を持つ導電性
のポリマーコンパウンドで形成されており、2つの平行
な主平面1a、1bを有する板状に形成されている。符
号2及び3はPTCポリマー板1に電流を流すために、
PTCポリマー板1の2つの平行な主平面1aと主平面
1bとに接触するように配設された電極である。符号4
及び5は絶縁部材であり、例えばガラス繊維によって強
化された樹脂で形成され、PTCポリマー板1を中央に
して挟持する2つの電極2、3を更に加圧して挟持す
る。尚、符号6は絶縁部材4、5の端部に形成された貫
通孔4a、5aに挿入されたボルト、7は止めナット、
8は弾性部材としてのバネであり、絶縁部材4、5を締
め付けることにより、PTCポリマー板1の主平面1
a、1bと電極2、3との接触面に対して垂直方向の圧
力を加えて、PTCポリマー板1と2つの電極2、3と
の接触抵抗を低減させるように構成されている。符号9
は絶縁枠である。絶縁枠9は、PTCポリマー板1の外
縁周面に取り付けられ、後述の導電性ガスによる電極
2、3間の絶縁破壊を防止するためのものである。2. Description of the Related Art FIG.
FIG. 1 is a side sectional view showing a conventional current limiting element disclosed in Japanese Patent Application Laid-Open Publication No. HEI 10-115,000. Reference numeral 1 in the drawing denotes a PTC polymer plate as a PTC element plate having PTC characteristics. The PTC polymer plate 1 is formed of a conductive polymer compound having a positive temperature coefficient of resistance containing a polymer material and a conductive powder material dispersed in the polymer material. It is formed in a plate shape having 1a and 1b. Symbols 2 and 3 are used to pass a current through the PTC polymer plate 1,
The electrodes are provided so as to be in contact with two parallel main planes 1a and 1b of the PTC polymer plate 1. Code 4
And 5 are insulating members formed of, for example, a resin reinforced by glass fiber, and pressurize and hold two electrodes 2 and 3 sandwiching the PTC polymer plate 1 at the center. Reference numeral 6 denotes a bolt inserted into through holes 4a, 5a formed at the ends of the insulating members 4, 5, reference numeral 6 denotes a lock nut,
Reference numeral 8 denotes a spring as an elastic member, which tightens the insulating members 4 and 5 to form a main plane 1 of the PTC polymer plate 1.
The contact resistance between the PTC polymer plate 1 and the two electrodes 2 and 3 is reduced by applying a pressure in the vertical direction to the contact surfaces between the electrodes a and 1b and the electrodes 2 and 3. Code 9
Is an insulating frame. The insulating frame 9 is attached to the outer peripheral surface of the PTC polymer plate 1 to prevent dielectric breakdown between the electrodes 2 and 3 due to a conductive gas described later.
【0003】このような限流素子は、例えば過電流保護
回路等に用いられる。PTCポリマー板1の抵抗値は、
PTCポリマー板1の動作温度135℃以下においては
例えば数mΩである。過電流保護回路に短絡電流が流れ
ると、PTCポリマー板1と電極2、3とのそれぞれの
接触面に電磁反発力が発生し、それによってPTCポリ
マー板1と電極2、3との接触点が減少する。これは、
残っている接触点への短絡電流の集中につながり、ジュ
ール熱が発生し、このジュール熱によって接触点でのP
TCポリマー板1の温度を上昇させる。この温度がPT
Cポリマー板1の動作温度を越えると、PTCポリマー
板1は低抵抗状態から高抵抗状態に変化し、その抵抗値
は例えば数Ωになる。そして、この抵抗値の増加によっ
て短絡電流は限流される。[0003] Such a current limiting element is used, for example, in an overcurrent protection circuit or the like. The resistance value of the PTC polymer plate 1 is
When the operating temperature of the PTC polymer plate 1 is 135 ° C. or lower, the resistance is, for example, several mΩ. When a short-circuit current flows through the overcurrent protection circuit, an electromagnetic repulsive force is generated on the respective contact surfaces between the PTC polymer plate 1 and the electrodes 2 and 3, and thereby the contact points between the PTC polymer plate 1 and the electrodes 2 and 3 are changed. Decrease. this is,
The short circuit current is concentrated on the remaining contact points, and Joule heat is generated.
The temperature of the TC polymer plate 1 is increased. This temperature is PT
When the operating temperature of the C polymer plate 1 is exceeded, the PTC polymer plate 1 changes from a low resistance state to a high resistance state, and its resistance value becomes, for example, several Ω. The increase in the resistance value limits the short-circuit current.
【0004】上記のような限流素子では、PTCポリマ
ー板1に短絡電流が流れたときに、PTCポリマー板1
と電極2、3との接触点の更に微小領域においては、P
TCポリマー板1の動作温度をはるかに超えてポリマー
材料の気化温度を超え、アークが発生し、このアークに
よって加熱された多量のガスが発生する。このガスは高
温度であるため電子やイオンを含み、導電性を有してい
る。PTCポリマー板1の主平面1a、1bの端面周辺
から放出された上記の高温導電性ガスは、PTCポリマ
ー板1の縁周辺部にて、電極2と電極3との間の絶縁破
壊を防止するため、絶縁枠9を設けることが必要とな
る。In the current limiting element as described above, when a short-circuit current flows through the PTC polymer plate 1, the PTC polymer plate 1
In a further minute area of the contact point between the electrodes and the electrodes 2 and 3, P
The temperature exceeds the operating temperature of the TC polymer plate 1 and exceeds the vaporization temperature of the polymer material, and an arc is generated, which generates a large amount of heated gas. Since this gas has a high temperature, it contains electrons and ions and has conductivity. The high-temperature conductive gas released from the periphery of the principal planes 1a and 1b of the PTC polymer plate 1 prevents dielectric breakdown between the electrode 2 and the electrode 3 around the edge of the PTC polymer plate 1. Therefore, it is necessary to provide the insulating frame 9.
【0005】絶縁枠9を設けるには、一般に、次のよう
に行われる。先ず、PTCポリマー板1の形状を有する
金型にてPTCポリマー板1を成形し、その後、PTC
ポリマー板1と絶縁枠9の形状を有する金型に、PTC
ポリマー板1を挿入して、空間となる絶縁枠9の部分に
絶縁性樹脂を注入して成形する。[0005] The provision of the insulating frame 9 is generally performed as follows. First, the PTC polymer plate 1 is molded using a mold having the shape of the PTC polymer plate 1, and then the PTC polymer plate 1 is molded.
PTC is added to a mold having the shape of the polymer plate 1 and the insulating frame 9.
The polymer plate 1 is inserted, and an insulating resin is injected into a portion of the insulating frame 9 serving as a space to be molded.
【0006】[0006]
【発明が解決しようとする課題】上記のような従来のP
TCポリマー板1による限流素子では、絶縁枠9の形成
時に熱的ストレスが加わり、常温に冷却されたとき絶縁
枠9が縮み限流素子が反ったり、割れたりして、電極2
と電極3との間で絶縁破壊しやすいという問題があっ
た。又、絶縁枠9は、別途成形されて、PTCポリマー
板1の外縁周面に密着されていたため、大きな短絡電流
を限流すると、熱膨張によりPTCポリマー板1が大き
く伸びて、絶縁枠9が押されて変形し、PTCポリマー
板1との間に大きな隙間が生じたり、PTCポリマー板
1にストレスが加わって割れたりして、電極2と電極3
との間で絶縁破壊するという問題があった。The conventional P as described above
In the current limiting element using the TC polymer plate 1, thermal stress is applied when the insulating frame 9 is formed, and when cooled to room temperature, the insulating frame 9 shrinks, and the current limiting element warps or cracks.
There is a problem that dielectric breakdown easily occurs between the electrode 3 and the electrode 3. Further, since the insulating frame 9 is separately formed and is closely adhered to the outer peripheral surface of the PTC polymer plate 1, when a large short-circuit current is limited, the PTC polymer plate 1 greatly expands due to thermal expansion and the insulating frame 9 The PTC polymer plate 1 is deformed by being pressed, and a large gap is formed between the PTC polymer plate 1 and the PTC polymer plate 1.
There is a problem that dielectric breakdown occurs between these two.
【0007】本発明は、上述のような課題を解決し、大
きな短絡電流が流れても絶縁破壊が生じ難く、耐久性の
高い限流素子の提供を目的とする。An object of the present invention is to solve the problems described above and to provide a current-limiting element having high durability, which is unlikely to cause dielectric breakdown even when a large short-circuit current flows.
【0008】[0008]
【課題を解決するための手段】請求項1の発明は、PT
C素子板と、当該PTC素子板の外縁周面を囲んでPT
C素子板を保持する絶縁枠とを備えた限流素子におい
て、前記絶縁枠はPTC素子板との間に隙間を設けて当
該PTC素子板を保持させたことを特徴とする。According to the first aspect of the present invention, a PT
C element plate and a PT element surrounding the outer peripheral surface of the PTC element plate.
In a current limiting device having an insulating frame for holding a C element plate, a gap is provided between the insulating frame and the PTC element plate to hold the PTC element plate.
【0009】請求項2の発明は、PTC素子板と、当該
PTC素子板の外縁周面を包むように内周面が断面コ字
状に形成された絶縁枠とを備えた限流素子において、P
TC素子板と前記絶縁枠の内周面との間に間隙を設けた
構成したことを特徴とする。According to a second aspect of the present invention, there is provided a current limiting element having a PTC element plate and an insulating frame having an inner peripheral surface formed in a U-shape in cross section so as to surround the outer peripheral surface of the PTC element plate.
A gap is provided between the TC element plate and the inner peripheral surface of the insulating frame.
【0010】請求項3の発明は、請求項2に記載の限流
素子において、間隙はPTC素子板を支承するよう絶縁
枠に形成された複数の支承部により断面コ字状に形成さ
れたことを特徴とする。According to a third aspect of the present invention, in the current limiting element according to the second aspect, the gap is formed in a U-shaped cross section by a plurality of support portions formed on the insulating frame to support the PTC element plate. It is characterized by.
【0011】請求項4の発明は、請求項2又は請求項3
に記載の限流素子において、間隙の幅は最大でPTC素
子板の板厚の1/2であることを特徴とする。[0011] The invention of claim 4 is the invention of claim 2 or claim 3.
Wherein the width of the gap is at most half the thickness of the PTC element plate.
【0012】請求項5の発明は、請求項2又は請求項3
に記載の限流素子において、PTC素子板の外縁周面を
包むように配置された内周面が断面コ字状の絶縁枠は、
内周面が断面L字状に形成された一対の枠構成部材を向
かい合わせに合致させた構成としたことを特徴とする。[0012] The invention of claim 5 is the invention of claim 2 or claim 3.
In the current limiting element described in the above, the inner peripheral surface arranged to wrap the outer peripheral surface of the PTC element plate is an insulating frame having a U-shaped cross section,
It is characterized in that a pair of frame components whose inner peripheral surfaces are formed in an L-shaped cross section face each other.
【0013】請求項6の発明は、請求項2又は請求項3
に記載の限流素子において、PTC素子板の外縁周面を
包むように配置された内周面が断面コ字状の絶縁枠は、
内周面が断面L字状に形成された一対の枠構成部材の一
辺側を屈曲自在に連結し、当該屈曲軸を中心にして向か
い合わせに閉じあわせた構成としたことを特徴とする。[0013] The invention of claim 6 is the invention of claim 2 or claim 3.
In the current limiting element described in the above, the inner peripheral surface arranged to wrap the outer peripheral surface of the PTC element plate is an insulating frame having a U-shaped cross section,
It is characterized in that one side of a pair of frame components whose inner peripheral surfaces are formed in an L-shaped cross section is flexibly connected to each other, and is closed face-to-face around the bending axis.
【0014】請求項7の発明は、請求項2又は請求項3
に記載の限流素子において、PTC素子板の外縁周面を
包むように配置された内周面が断面コ字状の絶縁枠は、
PTC素子板を当該絶縁枠の一辺に形成された差入口か
ら差し込んだ後、差入口が絶縁素材で封鎖された構成と
したことを特徴とする。According to a seventh aspect of the present invention, there is provided the second or third aspect.
In the current limiting element described in the above, the inner peripheral surface arranged to wrap the outer peripheral surface of the PTC element plate is an insulating frame having a U-shaped cross section,
After the PTC element plate is inserted from the entrance formed on one side of the insulating frame, the entrance is closed with an insulating material.
【0015】請求項8の発明は、請求項1乃至7の何れ
かに記載の限流素子において、PTC素子板はPTC特
性を有するPTCポリマー板であることを特徴とする。According to an eighth aspect of the present invention, in the current limiting element according to any one of the first to seventh aspects, the PTC element plate is a PTC polymer plate having PTC characteristics.
【0016】[0016]
【発明の実施の形態】実施の形態1.この実施の形態1
は、PTC素子板と絶縁枠との間に隙間を設けて当該P
TC素子板を絶縁枠に保持させた構成としたもので、絶
縁枠は、内周面が断面L字状で枠状に形成された一対の
枠構成部材を向かい合わせに合致させることで、内周面
が断面コ字状に構成され、当該断面コ字状の内周面がP
TC素子板の外縁周面を包むように形成したものであ
る。図1は限流素子の要部を示す側断面図であり、図2
は分解斜視図、図3は一部断面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1
Provides a gap between the PTC element plate and the insulating frame to
The TC element plate is held by an insulating frame. The insulating frame has an inner peripheral surface formed by facing a pair of frame components formed in a frame shape with an L-shaped cross section facing each other. The peripheral surface has a U-shaped cross section, and the inner peripheral surface of the U-shaped cross section is P
It is formed so as to surround the outer peripheral surface of the TC element plate. FIG. 1 is a side sectional view showing a main part of the current limiting element, and FIG.
Is an exploded perspective view, and FIG. 3 is a partial sectional view.
【0017】図1乃至図3において、図中の符号1は、
PTC素子板としてのPTCポリマー板で、ポリマー材
料とポリマー材料中に分散させた導電性の粉末材料とを
含んだ正の抵抗温度係数を持つ導電性のポリマーコンパ
ウンドから形成されており、主平面1aと主平面1bと
の2つの主平面を有する板状に形成されている。符号2
及び3はPTCポリマー板1に電流を流すために、PT
Cポリマー板1の2つの主平面1a、1bとにそれぞれ
両側から接触するように配設された電極である。In FIGS. 1 to 3, reference numeral 1 in the drawings denotes
A PTC polymer plate as a PTC element plate, which is formed of a conductive polymer compound having a positive temperature coefficient of resistance containing a polymer material and a conductive powder material dispersed in the polymer material; And a main plane 1b. Sign 2
And 3 are PTs for passing a current through the PTC polymer plate 1.
The electrodes are disposed so as to contact the two main planes 1a and 1b of the C polymer plate 1 from both sides.
【0018】符号4及び5は、更に電極2、3のそれぞ
れの背後から電極2、3及びPTCポリマー板1を挟圧
する絶縁部材であり、例えばガラス繊維によって強化さ
れた樹脂で形成され、PTCポリマー板1及び2つの電
極2、3を加圧して挟持している。符号6は絶縁部材
4、5の端部に形成された貫通孔4a、5aに挿入され
たボルト、7は止めナット、8は弾性部材としてのバネ
で、2つの絶縁部材4、5を締め付けることにより、P
TCポリマー板1の主平面1a、1bと電極2、3との
接触面に対して垂直方向の圧力を加えて、PTCポリマ
ー板1と2つの電極2、3との接触抵抗を低減させるよ
うに構成されている。Reference numerals 4 and 5 denote insulating members for pressing the electrodes 2 and 3 and the PTC polymer plate 1 from behind each of the electrodes 2 and 3, and are formed of, for example, a resin reinforced by glass fiber, and The plate 1 and the two electrodes 2, 3 are pressed and sandwiched. Reference numeral 6 denotes a bolt inserted into through holes 4a and 5a formed at the ends of the insulating members 4 and 5, reference numeral 7 denotes a lock nut, and reference numeral 8 denotes a spring as an elastic member, which tightens the two insulating members 4 and 5. By P
By applying a pressure in the vertical direction to the contact surface between the principal planes 1a and 1b of the TC polymer plate 1 and the electrodes 2 and 3, the contact resistance between the PTC polymer plate 1 and the two electrodes 2 and 3 is reduced. It is configured.
【0019】さて、符号14は絶縁枠であり、PTCポ
リマー板1の外縁周面に、当該PTCポリマー板1の2
つの主平面1a、1bに向かう方向から当該PTCポリ
マー板1を嵌め込むように2分割された枠状の枠構成部
材14x、14yを一対として構成されている。この例
では内周面が断面L字状に形成された同一形状の2個の
枠構成部材14x、14yを向かい合わせに合体、即ち
組み合わせることで断面コ字状の内周面を持つ絶縁枠1
4を構成している。絶縁枠14を構成する2つの枠構成
部材14x、14yは、それぞれ、PTCポリマー板1
の四つの端面を巡る外縁周面に沿う内枠14aと、PT
Cポリマー板1の主平面1a、1bの一方の平面を縁取
るように四辺を巡り覆う外枠14bとを有する断面L型
をなし、同一形状のこの2つの枠構成部材14x、14
yを向かい合わせ合体させることで、断面がコ字状の内
周面が形成されている。図中の符号14cは係止突起、
14dは係止穴であり一対の枠構成部材14x、14y
の合体、即ち組み合わせを維持する。尚、一対の枠構成
部材14xと14yとの合体面は、PTCポリマー板1
の厚さ内に位置することになって、PTCポリマー板1
の主平面1a、1bからは直接見通せないため、PTC
ポリマー板1の作動時に発生するガスがこの合体面の面
と面との間隙を通過することはほとんど無く、通過によ
る絶縁枠14の破損の虞はない。Reference numeral 14 denotes an insulating frame which is provided on the outer peripheral surface of the PTC polymer
A pair of frame-shaped frame components 14x, 14y divided into two so as to fit the PTC polymer plate 1 from the direction toward the two main planes 1a, 1b. In this example, an insulating frame 1 having an inner peripheral surface having a U-shaped cross section is formed by combining two frame forming members 14x and 14y having the same shape whose inner peripheral surfaces are formed in an L-shaped cross section, facing each other.
4. The two frame components 14x and 14y that constitute the insulating frame 14 are each a PTC polymer plate 1
Inner frame 14a along the outer peripheral surface around the four end surfaces of the
An outer frame 14b covering four sides so as to border one of the main planes 1a and 1b of the C polymer plate 1 forms an L-shaped cross section, and these two frame constituting members 14x and 14 having the same shape.
The inner peripheral surface having a U-shape in cross section is formed by joining y face to face. Reference numeral 14c in FIG.
14d is a locking hole, which is a pair of frame members 14x and 14y.
, Ie, the combination is maintained. The united surface of the pair of frame components 14x and 14y is the PTC polymer plate 1
Of the PTC polymer plate 1
PTCs cannot be seen directly from the main planes 1a and 1b of
The gas generated during the operation of the polymer plate 1 hardly passes through the gap between the combined surfaces, and there is no fear that the insulating frame 14 is damaged by the passage.
【0020】合体された2つの内枠14a、14aを合
わせた枠溝幅、即ちコ字状の内部空間における縦方向の
幅は、PTCポリマー板1の板厚より大きくなるよう予
め設定している。この例では、枠溝幅≦PTCポリマー
板の板厚+PTCポリマー板の板厚×1/2としてい
る。又、内枠14aの縦方向の差渡し長さについては、 縦差渡長≦PTCポリマー板の縦の差渡し長さ+PTC
ポリマー板の板厚×1/2 内枠14aの横の差渡し長さについても、同様に、 横差渡長≦PTCポリマー板の横の差渡し長さ+PTC
ポリマー板の板厚×1/2 としている。The groove width of the combined inner frames 14a, 14a, that is, the width in the vertical direction in the U-shaped internal space is set in advance to be larger than the thickness of the PTC polymer plate 1. . In this example, the width of the frame groove ≦ the thickness of the PTC polymer plate + the thickness of the PTC polymer plate × 1 /. The length of the inner frame 14a in the vertical direction is as follows: vertical length ≦ the vertical length of the PTC polymer plate + PTC.
Similarly, the transverse width of the inner frame 14a is calculated as follows: transverse width ≦ transverse transverse length of the PTC polymer plate + PTC.
The thickness of the polymer plate is 1/2.
【0021】次に、図1において、上記の絶縁枠14が
PTCポリマー板1を保持している状態における絶縁枠
14とPTCポリマー板1との間隙について説明する。
図中の符号AはPTCポリマー板1の厚さ、CはPTC
ポリマー板1の長さ、Bは絶縁枠14の開口部高さ即ち
上記の枠溝幅、Dは絶縁枠14の内枠14aの内側の長
さ即ち縦又は横の差渡し長さで、B−A≦A/2、D−
C≦A/2の関係となっている。このため、絶縁枠14
でPTCポリマー板1を保持したとき、PTCポリマー
板1にはストレスがかからない状態となる。Next, referring to FIG. 1, the gap between the insulating frame 14 and the PTC polymer plate 1 in a state where the insulating frame 14 holds the PTC polymer plate 1 will be described.
The symbol A in the figure is the thickness of the PTC polymer plate 1, and C is the PTC
The length of the polymer plate 1, B is the height of the opening of the insulating frame 14, that is, the width of the above-mentioned frame groove, and D is the length inside the inner frame 14 a of the insulating frame 14, that is, the vertical or horizontal span length, B −A ≦ A / 2, D−
C ≦ A / 2. For this reason, the insulating frame 14
When the PTC polymer plate 1 is held in the state described above, no stress is applied to the PTC polymer plate 1.
【0022】PTCポリマー板1の厚みを1mmとし、
PTCポリマー板1と断面コ字状の絶縁枠14の内周面
との間隙を、0.1mm、0.2mm、0.4mm、
0.6mm、0.8mmとする試料を製作して限流試験
を行った。その結果、0.1mm、0.2mm、0.4
mmの隙間では、3回の限流動作に成功した。0.6m
mと0.8mmの間隙では、1回目で絶縁破壊した。こ
の限流試験結果より、PTCポリマー板1と断面コ字状
の絶縁枠の内周面との間隙は、PTCポリマー板1の1
/2の厚さが好ましいことが示された。従って、2つの
電極2、3間の絶縁破壊を防止できる絶縁枠14をPT
Cポリマー板1にストレスを与えないでこれを保持する
ことができた。The thickness of the PTC polymer plate 1 is 1 mm,
The gap between the PTC polymer plate 1 and the inner peripheral surface of the insulating frame 14 having a U-shaped cross section is 0.1 mm, 0.2 mm, 0.4 mm,
Samples of 0.6 mm and 0.8 mm were produced and subjected to a current limiting test. As a result, 0.1 mm, 0.2 mm, 0.4
In the gap of mm, three current limiting operations were successful. 0.6m
In the gap between m and 0.8 mm, the first dielectric breakdown occurred. From the results of the current limiting test, the gap between the PTC polymer plate 1 and the inner peripheral surface of the insulating frame having a U-shaped cross section is 1
A thickness of / 2 has been shown to be preferred. Therefore, the insulating frame 14 that can prevent dielectric breakdown between the two electrodes 2 and 3 is made of PT
This could be maintained without giving stress to the C polymer plate 1.
【0023】上記したPTC素子板1と絶縁枠14の内
周面との間隙は、図において上下左右とも均等な間隔、
即ちコ字状の間隔を維持した状態で保持されているが、
これは、図4乃至図6に示すように、絶縁枠14の内周
面側に、PTC素子板1を支承するように形成された複
数の支承部14zを適当に配設しているからである。し
かし、本発明では、必ずしも、このように、PTC素子
板1と絶縁枠14の内周面との間隙を均等な間隔にて、
恰も、PTC素子板1を空中に浮かせる形に保持する必
要はない。従って、上記のような支承部14zは必須の
構成要素ではない。即ち、上記で説明した間隔が形成さ
れる条件を与えた絶縁枠14にPTC素子板1を単に保
持させておくだけでよいのである。この場合、PTC素
子板1は絶縁枠14に保持された状態にて多少ガタツキ
を生ずるが、機能上何らの支障はなく、上記した作用効
果を発揮できる。The gap between the above-mentioned PTC element plate 1 and the inner peripheral surface of the insulating frame 14 is the same at the top, bottom, left and right in FIG.
In other words, it is held with the U-shaped interval maintained,
This is because a plurality of support portions 14z formed to support the PTC element plate 1 are appropriately arranged on the inner peripheral surface side of the insulating frame 14, as shown in FIGS. is there. However, in the present invention, the gap between the PTC element plate 1 and the inner peripheral surface of the insulating frame 14 is not necessarily equal, as described above.
It is not necessary to hold the PTC element plate 1 in a form floating in the air. Therefore, the support portion 14z as described above is not an essential component. That is, it is only necessary to simply hold the PTC element plate 1 on the insulating frame 14 provided with the conditions for forming the above-described interval. In this case, the PTC element plate 1 slightly rattles while being held by the insulating frame 14, but there is no problem in function and the above-mentioned effects can be exhibited.
【0024】実施の形態2.実施の形態2は、内周面が
断面コ字状の絶縁枠は、内周面が断面L字状に形成され
た一対の枠構成部材の一辺側を屈曲自在に連結し、この
屈曲軸を中心にして向かい合わせに閉じ合せて構成した
ものである。図7はこの絶縁枠15の斜視図である。図
中の符号1はPTC素子板としてのPTCポリマー板で
ある。この絶縁枠15は、PTCポリマー板1を挟む一
対の枠構成部材15xと15yとの2面がその一辺にお
いて連結され屈曲自在に一体形成されて、その屈曲軸1
5fを中心に開閉する。図中の符号15aはPTCポリ
マー板1の外縁周に沿う内枠、15bは、PTCポリマ
ー板1としてのサーミスタ素子を挟む外枠である。Embodiment 2 FIG. In the second embodiment, an insulating frame having an inner peripheral surface having a U-shaped cross section is configured such that one side of a pair of frame forming members having inner peripheral surfaces formed into an L-shaped cross section is flexibly connected to each other, and this bending axis is connected. It is configured to be face-to-face and closed at the center. FIG. 7 is a perspective view of the insulating frame 15. Reference numeral 1 in the drawing denotes a PTC polymer plate as a PTC element plate. The insulating frame 15 has a pair of frame forming members 15x and 15y sandwiching the PTC polymer plate 1 connected at one side thereof, and is integrally formed so as to be freely bendable.
Open and close around 5f. Reference numeral 15a in the figure denotes an inner frame along the outer periphery of the PTC polymer plate 1, and 15b denotes an outer frame which sandwiches the thermistor element as the PTC polymer plate 1.
【0025】2つの内枠15aが合わされたときの枠溝
幅は、上記実施の形態1と同様にPTCポリマー板1の
厚さにPTCポリマー板1の1/2以下の厚さを加えた
寸法となっている。又、内枠15aの縦及び横の差渡し
長さも、PTCポリマー板1の長さより、PTCポリマ
ー板1の厚みの1/2以下ほど長くなっている。上記の
屈曲自在な屈曲軸15fと絶縁枠15の外周側の形態を
除き、この実施の形態2は実質的に上記実施の形態1と
基本的に同様である。従って、この形態においても、実
施の形態1に示した図1と同様にB−A≦A/2、D−
C≦A/2の関係にある。The width of the frame groove when the two inner frames 15a are combined is the dimension obtained by adding the thickness of the PTC polymer plate 1 to the thickness of the PTC polymer plate 1 or less, as in the first embodiment. It has become. The length of the inner frame 15a in the vertical and horizontal directions is longer than the length of the PTC polymer plate 1 by about の or less of the thickness of the PTC polymer plate 1. The second embodiment is basically the same as the first embodiment, except for the form of the bendable shaft 15f and the outer peripheral side of the insulating frame 15. Accordingly, also in this embodiment, BA ≦ A / 2, D−
C ≦ A / 2.
【0026】この実施の形態2では、PTCポリマー板
1を挿入して屈曲部15fを折り曲げることにより、P
TCポリマー板1の外縁周に絶縁枠15を取り付けるこ
とができる。そして、図に示す係止突起15cと係止穴
15dとで、一対の枠構成部材15xと15yとの合体
状態が維持される。In the second embodiment, by inserting the PTC polymer plate 1 and bending the bent portion 15f,
An insulating frame 15 can be attached to the outer periphery of the TC polymer plate 1. Then, the engagement state of the pair of frame components 15x and 15y is maintained by the engagement protrusion 15c and the engagement hole 15d shown in the drawing.
【0027】実施の形態2において、PTCポリマー板
1の厚みを1mmとし、PTCポリマー板1と内周面の
断面がコ字状の絶縁枠15との隙間を、0.1mm、
0.2mm、0.4mm、0.6mm、0.8mmとす
る試料を製作し限流試験を行った。その結果、0.1m
m、0.2mm、0.4mmの隙間では、3回の限流動
作に成功した。0.6mmと0.8mmの隙間では1回
目で絶縁破壊した。この限流試結果より、PTCポリマ
ー板1と絶縁枠15との間隙は、PTCポリマー板1の
1/2の厚さが好ましいことが示された。従って、この
実施の形態2においても、2つの電極2、3間の絶縁破
壊を防止できる絶縁枠15をPTCポリマー板1にスト
レスを与えないで設けることができた。In the second embodiment, the thickness of the PTC polymer plate 1 is 1 mm, and the gap between the PTC polymer plate 1 and the insulating frame 15 whose inner peripheral surface has a U-shape is 0.1 mm.
Samples of 0.2 mm, 0.4 mm, 0.6 mm, and 0.8 mm were manufactured and subjected to a current limiting test. As a result, 0.1m
In the gaps of m, 0.2 mm, and 0.4 mm, the current limiting operation was successfully performed three times. In the gap between 0.6 mm and 0.8 mm, the first dielectric breakdown occurred. The results of the current limiting test show that the gap between the PTC polymer plate 1 and the insulating frame 15 is preferably half the thickness of the PTC polymer plate 1. Therefore, also in the second embodiment, the insulating frame 15 that can prevent dielectric breakdown between the two electrodes 2 and 3 can be provided without applying stress to the PTC polymer plate 1.
【0028】実施の形態3.実施の形態3は、内周面が
断面コ字状の絶縁枠を、PTC素子板を当該絶縁枠の一
辺に形成された差入口から差し込んだ後、差入口を絶縁
素材(図示せず)で封鎖した構成としたものである。図
8はこの絶縁枠16を示す。図中の符号16aはPTC
ポリマー板1を挿入する差込口である。絶縁枠16の1
辺にPTCポリマー板1を挿入する開口部16Cが設け
られている。この開口部16cは、PTCポリマー板1
を挿入後、適当な絶縁部材で閉じられる。Embodiment 3 In the third embodiment, after inserting an insulating frame whose inner peripheral surface has a U-shaped cross section, a PTC element plate is inserted from a port formed on one side of the insulating frame, the port is made of an insulating material (not shown). This is a closed configuration. FIG. 8 shows the insulating frame 16. The symbol 16a in the figure is PTC
This is an insertion port into which the polymer plate 1 is inserted. 1 of insulating frame 16
An opening 16C for inserting the PTC polymer plate 1 is provided on the side. The opening 16c is provided in the PTC polymer plate 1
After insertion, it is closed with a suitable insulating member.
【0029】この実施の形態3も、上記実施の形態1と
同様に、PTCポリマー板1と内周面の断面がコ字状の
絶縁枠16との間隙は、PTCポリマー板1の1/2以
下の厚さに構成されている。又、内枠16aの縦横の差
渡し長さは、何れもPTCポリマー板1の長さより、P
TCポリマー板1の厚みの1/2以下ほど長くなってい
る。従って、この実施の形態3の絶縁枠16もまた、上
記実施の形態1に示した図1と同様に、B−A≦A/
2、D−C≦A/2の関係にある。In the third embodiment, similarly to the first embodiment, the gap between the PTC polymer plate 1 and the insulating frame 16 whose inner peripheral surface has a U-shaped cross section is 、 of that of the PTC polymer plate 1. It has the following thickness. Further, the length of the inner frame 16a in the vertical and horizontal directions is more than the length of the PTC polymer plate 1 by P.
The length is about 1/2 or less of the thickness of the TC polymer plate 1. Therefore, the insulating frame 16 according to the third embodiment also has BA-A ≦ A /, as in FIG. 1 shown in the first embodiment.
2. There is a relation of DC ≦ A / 2.
【0030】この実施の形態において、PTCポリマー
板1の厚みを1mmとし、PTCポリマー板1と内周面
の断面がコ字状の絶縁枠16との隙間を、0.1mm、
0.2mm、0.4mm、0.6mm、0.8mmとす
る試料を製作し限流試験を行った。その結果、0.1m
m、0.2mm、0.4mmの隙間では、3回の限流動
作に成功した。0.6mmのの隙間では2回目で絶縁破
壊した。0.8mmの隙間では、1回目で絶縁破壊し
た。この限流試験結果より、PTCポリマー板1と絶縁
枠16との隙間は、PTCポリマー板1の1/2の厚さ
が好ましいことが示された。従って、この実施の形態3
においても、簡易に絶縁枠を形成できるとともに、2つ
の電極2、3間の絶縁破壊を防止できる絶縁枠16をP
TCポリマー板1にストレスを与えないで設けることが
できた。In this embodiment, the thickness of the PTC polymer plate 1 is 1 mm, and the gap between the PTC polymer plate 1 and the insulating frame 16 whose inner peripheral surface has a U-shaped cross section is 0.1 mm.
Samples of 0.2 mm, 0.4 mm, 0.6 mm, and 0.8 mm were manufactured and subjected to a current limiting test. As a result, 0.1m
In the gaps of m, 0.2 mm, and 0.4 mm, the current limiting operation was successfully performed three times. In the gap of 0.6 mm, the dielectric breakdown occurred the second time. In the gap of 0.8 mm, the first dielectric breakdown occurred. The results of the current limiting test show that the gap between the PTC polymer plate 1 and the insulating frame 16 is preferably half the thickness of the PTC polymer plate 1. Therefore, the third embodiment
Also, the insulating frame 16 which can easily form an insulating frame and can prevent dielectric breakdown between the two
The TC polymer plate 1 could be provided without applying stress.
【0031】[0031]
【発明の効果】請求項1乃至請求項9の発明によれば、
絶縁枠をPTC素子板と別途に成形し生産することがで
きるので、従来のように、絶縁枠9の形成時に熱的スト
レスが加わったり常温に冷却される際などに、絶縁枠が
縮んで限流素子が反ったり、割れたりすることがなくな
り、生産性を向上させることができる。又、PTC素子
板と絶縁枠との間に間隙を設けているので、従来のよう
な、絶縁枠を別途成形した後にPTCポリマー板1の外
縁周面に密着させた構成では、大きな短絡電流を限流す
ると、熱膨張によりPTCポリマー板が大きく伸び、絶
縁枠が押されて変形したり、PTC素子板との間に大き
な隙間が開いたり、PTC素子板にストレスが加わって
割れたりして、電極2と電極3との間で絶縁破壊すると
いう問題が生じたが、これらの諸問題をれ解消すること
ができ、大きな短絡電流が流れても絶縁破壊が生じ難
く、耐久性の高い限流素子を提供することができる。According to the first to ninth aspects of the present invention,
Since the insulating frame can be formed separately from the PTC element plate and produced, as in the conventional case, when the insulating frame 9 is subjected to thermal stress or cooled to room temperature, the insulating frame shrinks and is limited. The flow element does not warp or break, and productivity can be improved. In addition, since a gap is provided between the PTC element plate and the insulating frame, in a conventional configuration in which the insulating frame is separately formed and then closely attached to the outer peripheral surface of the PTC polymer plate 1, a large short-circuit current is generated. When the current limit occurs, the PTC polymer plate expands greatly due to thermal expansion, the insulating frame is pressed and deformed, a large gap is opened between the PTC device plate, and the PTC device plate is cracked by applying stress. Although the problem of dielectric breakdown between the electrode 2 and the electrode 3 has occurred, these problems can be solved and the dielectric breakdown does not easily occur even when a large short-circuit current flows. An element can be provided.
【0032】又、請求項2の発明によれば、PTC素子
板と絶縁枠との間に間隙を設けたことにより、絶縁枠
は、絶縁破壊を防止する絶縁枠としての機能を果たしつ
つ、PTC素子板にストレスを与えないでこれを保持す
ることができ、従って、限流動作回数を増加させること
ができる。According to the second aspect of the present invention, since the gap is provided between the PTC element plate and the insulating frame, the insulating frame functions as an insulating frame for preventing dielectric breakdown while maintaining the PTC function. This can be maintained without applying stress to the element plate, and therefore, the number of current limiting operations can be increased.
【0033】又、請求項6の発明によれば、2つの電極
間の絶縁破壊を防止できる絶縁枠をPTCポリマー板に
ストレスを与えないで設けることができるため、限流動
作回数を増加させることができ、耐久性の高い限流素子
を提供することができる。According to the sixth aspect of the present invention, the insulating frame capable of preventing dielectric breakdown between the two electrodes can be provided without applying stress to the PTC polymer plate, so that the number of current limiting operations can be increased. Thus, a current limiting element having high durability can be provided.
【0034】又、請求項7の発明によれば、簡便な絶縁
枠を形成することができるとともに、2つの電極間の絶
縁破壊を防止できる絶縁枠をPTCポリマー板にストレ
スを与えないで設けることができるため、限流動作回数
を増加させることができ、耐久性の高い限流素子を提供
することができる。According to the seventh aspect of the present invention, a simple insulating frame can be formed, and an insulating frame capable of preventing dielectric breakdown between two electrodes can be provided without applying stress to the PTC polymer plate. Therefore, the number of current limiting operations can be increased, and a current limiting element with high durability can be provided.
【図1】 限流素子の要部を示す側断面図である。FIG. 1 is a side sectional view showing a main part of a current limiting element.
【図2】 PTC素子板と2つの電極と絶縁枠との分解
斜視図である。FIG. 2 is an exploded perspective view of a PTC element plate, two electrodes, and an insulating frame.
【図3】 図2の一部断面図である。FIG. 3 is a partial sectional view of FIG. 2;
【図4】 支承部の設置態様を示す概念図である。FIG. 4 is a conceptual diagram showing an installation mode of a bearing.
【図5】 支承部の設置態様を示す別の概念図である。FIG. 5 is another conceptual diagram showing an installation mode of a bearing.
【図6】 支承部の設置態様を示す更に別の概念図であ
る。FIG. 6 is still another conceptual diagram showing an installation mode of a bearing.
【図7】 実施の形態2の絶縁枠の斜視図である。FIG. 7 is a perspective view of an insulating frame according to the second embodiment.
【図8】 実施の形態2の絶縁枠の斜視図である。FIG. 8 is a perspective view of an insulating frame according to the second embodiment.
【図9】 従来の限流素子を示す側断面図である。FIG. 9 is a side sectional view showing a conventional current limiting element.
1 PTC素子板(PTCポリマー板)、2、3 電
極、4、5 絶縁部材、14 絶縁枠、14a 内枠、
14b 外枠、14c 係止突起、14d 係止穴、1
4z 支承部、15 絶縁枠、15a 内枠、15b
外枠、15c 係止突起、15d 係止穴、15f 折
曲部、16 絶縁枠、16a 内枠、16c 差込口。1 PTC element plate (PTC polymer plate), 2, 3 electrodes, 4 and 5 insulating member, 14 insulating frame, 14a inner frame,
14b outer frame, 14c locking projection, 14d locking hole, 1
4z bearing, 15 insulating frame, 15a inner frame, 15b
Outer frame, 15c locking projection, 15d locking hole, 15f bent portion, 16 insulating frame, 16a inner frame, 16c insertion port.
フロントページの続き (72)発明者 高橋 知恵 東京都千代田区丸の内二丁目2番3号 三 菱電機株式会社内 (72)発明者 西山 逸雄 東京都千代田区丸の内二丁目2番3号 三 菱電機株式会社内 (72)発明者 堀邊 英夫 東京都千代田区丸の内二丁目2番3号 三 菱電機株式会社内 (72)発明者 石川 雅廣 東京都千代田区丸の内二丁目2番3号 三 菱電機株式会社内 (72)発明者 村田 士郎 東京都千代田区丸の内二丁目2番3号 三 菱電機株式会社内 (72)発明者 仁科 健一 東京都千代田区丸の内二丁目2番3号 三 菱電機株式会社内 (72)発明者 曽我部 学 東京都千代田区丸の内二丁目2番3号 三 菱電機株式会社内 Fターム(参考) 5E034 AA07 AB01 AC10 DA02 DB06Continuing on the front page (72) Inventor Tomoe Takahashi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Itsuo 2-3-2 Marunouchi 2-chome, Chiyoda-ku, Tokyo Mitsubishi Electric Inside the company (72) Inventor Hideo Horibe 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Masahiro Ishikawa 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric stock Inside the company (72) Inventor Shiro Murata 2-3-2 Marunouchi, Chiyoda-ku, Tokyo, Japan Mitsubishi Electric Corporation (72) Inventor Kenichi Nishina 2-3-2, Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Manabu Sogabe 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term in Mitsubishi Electric Corporation (reference) 5E034 AA07 AB01 AC10 DA02 DB06
Claims (8)
縁周面を囲んでPTC素子板を保持する絶縁枠とを備え
た限流素子において、前記絶縁枠はPTC素子板との間
に隙間を設けて当該PTC素子板を保持させたことを特
徴とする限流素子。1. A current limiting device comprising a PTC element plate and an insulating frame surrounding the outer peripheral surface of the PTC element plate and holding the PTC element plate, wherein the insulating frame has a gap between the PTC element plate and the PTC element plate. Wherein the current limiting element is provided to hold the PTC element plate.
縁周面を包むように内周面が断面コ字状に形成された絶
縁枠とを備えた限流素子において、PTC素子板と前記
絶縁枠の内周面との間に間隙を設けて構成したことを特
徴とする限流素子。2. A current limiting device comprising a PTC element plate and an insulating frame having an inner peripheral surface formed in a U-shape in cross section so as to surround an outer peripheral surface of the PTC element plate. A current-limiting element, wherein a gap is provided between the frame and an inner peripheral surface of the frame.
枠に形成された複数の支承部により断面コ字状に形成さ
れたことを特徴とする請求項2に記載の限流素子。3. The current limiting element according to claim 2, wherein the gap is formed in a U-shaped cross section by a plurality of support portions formed on the insulating frame to support the PTC element plate.
/2であることを特徴とする請求項2又は請求項3に記
載の限流素子。4. The width of the gap is a maximum of one plate thickness of the PTC element plate.
The current limiting element according to claim 2 or 3, wherein the current limiting element is equal to / 2.
置された内周面が断面コ字状の絶縁枠は、内周面が断面
L字状に形成された一対の枠構成部材を向かい合わせに
合致させた構成としたことを特徴とする請求項2又は請
求項3に記載の限流素子。5. An insulating frame having a U-shaped cross-section on the inner peripheral surface arranged so as to surround the outer peripheral surface of the PTC element plate faces a pair of frame constituent members having an inner peripheral surface formed in an L-shaped cross section. The current limiting element according to claim 2 or 3, wherein the current limiting element is configured to match the alignment.
置された内周面が断面コ字状の絶縁枠は、内周面が断面
L字状に形成された一対の枠構成部材の一辺側を屈曲自
在に連結し、当該屈曲軸を中心にして向かい合わせに閉
じあわせた構成としたことを特徴とする請求項2又は請
求項3に記載の限流素子。6. An insulating frame having an inner peripheral surface having a U-shaped cross section, which is disposed so as to wrap the outer peripheral peripheral surface of the PTC element plate, wherein one side of a pair of frame constituting members having an inner peripheral surface formed into an L-shaped cross section. The current limiting element according to claim 2 or 3, wherein the sides are flexibly connected to each other and closed face-to-face around the bending axis.
置された内周面が断面コ字状の絶縁枠は、PTC素子板
を当該絶縁枠の一辺に形成された差入口から差し込んだ
後、差入口が絶縁素材で封鎖された構成としたことを特
徴とする請求項2又は請求項3に記載の限流素子。7. An insulating frame having a U-shaped cross section, which is disposed so as to surround the outer peripheral surface of the PTC element plate, is formed by inserting the PTC element plate from a slot formed on one side of the insulating frame. The current limiting element according to claim 2 or 3, wherein the inlet is closed with an insulating material.
Cポリマー板であることを特徴とする請求項1乃至請求
項7の何れかに記載の限流素子。8. The PTC element plate has a PT characteristic.
The current limiting element according to claim 1, wherein the current limiting element is a C polymer plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18450398A JP3830661B2 (en) | 1998-06-30 | 1998-06-30 | Current limiting element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18450398A JP3830661B2 (en) | 1998-06-30 | 1998-06-30 | Current limiting element |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000021604A true JP2000021604A (en) | 2000-01-21 |
JP3830661B2 JP3830661B2 (en) | 2006-10-04 |
Family
ID=16154337
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Application Number | Title | Priority Date | Filing Date |
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JP18450398A Expired - Fee Related JP3830661B2 (en) | 1998-06-30 | 1998-06-30 | Current limiting element |
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JP (1) | JP3830661B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100697918B1 (en) | 2005-01-12 | 2007-03-20 | 엘에스전선 주식회사 | PTC current limiting device having structure preventing flashover |
-
1998
- 1998-06-30 JP JP18450398A patent/JP3830661B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100697918B1 (en) | 2005-01-12 | 2007-03-20 | 엘에스전선 주식회사 | PTC current limiting device having structure preventing flashover |
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JP3830661B2 (en) | 2006-10-04 |
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