JP5342406B2 - Wiring equipment - Google Patents

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JP5342406B2
JP5342406B2 JP2009249208A JP2009249208A JP5342406B2 JP 5342406 B2 JP5342406 B2 JP 5342406B2 JP 2009249208 A JP2009249208 A JP 2009249208A JP 2009249208 A JP2009249208 A JP 2009249208A JP 5342406 B2 JP5342406 B2 JP 5342406B2
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sensor
case
ball
detection hole
discharge gas
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JP2011096513A (en
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晃 志知
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河村電器産業株式会社
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Description

本発明は、トラッキングの予兆を検出する機能を備えた電源コンセントや差込プラグ等の配線器具に関する。   The present invention relates to a wiring apparatus such as a power outlet or a plug having a function of detecting a sign of tracking.

従来、プラグ接続部に発生した放電ガスをトラッキングの予兆として検出し、警報器や回路遮断器を動作させる配線器具が知られている。例えば、図9に示す従来の電源コンセント51は、ケース52の前面カバー部52aにプラグ差込口53と検出孔54を備え、プラグ刃体(図示略)に発生した火花放電に伴う放電ガスGを検出孔54からケース52の内側に導き、内壁55に埋設した線状のセンサ56で検知し、検知信号を回路基板57上のトラッキング検出回路に送るようになっている。   2. Description of the Related Art Conventionally, there has been known a wiring device that detects discharge gas generated in a plug connection portion as a sign of tracking and operates an alarm device or a circuit breaker. For example, the conventional power outlet 51 shown in FIG. 9 includes a plug insertion port 53 and a detection hole 54 in the front cover 52a of the case 52, and a discharge gas G accompanying spark discharge generated in the plug blade (not shown). Is detected from the detection hole 54 to the inside of the case 52, detected by a linear sensor 56 embedded in the inner wall 55, and a detection signal is sent to a tracking detection circuit on the circuit board 57.

特許文献1には、ケースの前面に大径の透孔を形成し、透孔にブッシングを圧入し、ブッシングの中央に細径の検出孔を貫設した電源コンセントが記載されている。特許文献2には、2本のプラグ刃体の間においてケースに検出孔を形成し、放電ガスを検知するセンサと警報ランプおよび警報ブザーをケースに内蔵し、トラッキング検出機能を差込プラグに付加する技術が記載されている。   Patent Document 1 describes a power outlet in which a large-diameter through hole is formed on the front surface of a case, a bushing is press-fitted into the through-hole, and a small-diameter detection hole is formed in the center of the bushing. In Patent Document 2, a detection hole is formed in the case between two plug blades, a sensor for detecting discharge gas, an alarm lamp, and an alarm buzzer are incorporated in the case, and a tracking detection function is added to the plug. Technology to do is described.

特開2006−48962号公報Japanese Patent Laid-Open No. 2006-48962 特開2007−5027号公報JP 2007-5027 A

ところが、従来の配線器具によると、検出孔54がケース52の外面に常時開いているため、異物がケース52の内側に侵入しやすかった。特許文献1では、透孔をブッシングで塞いでいるが、ガス通路を確保するために、ブッシングに検出孔を微細加工する必要があり、配線器具の製作コストが高くつくという問題点があった。   However, according to the conventional wiring device, since the detection hole 54 is always open on the outer surface of the case 52, foreign matter easily enters the inside of the case 52. In Patent Document 1, the through hole is closed with a bushing. However, in order to secure a gas passage, it is necessary to finely process the detection hole in the bushing, and there is a problem that the manufacturing cost of the wiring device is high.

また、従来のトラッキング検出機構では、センサ56が検出孔54から空間的に切り離されているため、放電電流が流れ難い。しかも、センサ56と検出孔54がごく狭い面積で相対しているため、ケース52や内壁55の変形等で検出孔54とセンサ56の相対位置が変化した場合に、センサ56の感度が低下する虞があるという問題点もあった。   Further, in the conventional tracking detection mechanism, since the sensor 56 is spatially separated from the detection hole 54, it is difficult for the discharge current to flow. In addition, since the sensor 56 and the detection hole 54 are opposed to each other in a very small area, the sensitivity of the sensor 56 decreases when the relative position of the detection hole 54 and the sensor 56 changes due to deformation of the case 52 or the inner wall 55. There was also a problem of fear.

そこで、本発明の目的は、ケース内側への異物の侵入を抑制し、簡単かつ安価な機構でトラッキングを高精度に検出できる配線器具を提供することにある。   SUMMARY OF THE INVENTION An object of the present invention is to provide a wiring device that suppresses the entry of foreign matter into the inside of a case and can detect tracking with high accuracy by a simple and inexpensive mechanism.

上記課題を解決するために、本発明の配線器具は、ケースに検出孔を形成し、検出孔に通して放電ガスをケースの内側に導き、ケースの内壁に放電ガスを検知するセンサを設け、センサに係止孔を形成し、ケースの内面に凹部を検出孔と連通するように形成し、凹部に嵌合したボールの一部を係止孔に係止し、ボールと凹部との間に放電ガスを検出孔からセンサに導く細隙を形成したことを特徴とする。   In order to solve the above problems, the wiring device of the present invention is provided with a sensor that forms a detection hole in the case, guides the discharge gas to the inside of the case through the detection hole, and detects the discharge gas on the inner wall of the case, A locking hole is formed in the sensor, and a recess is formed on the inner surface of the case so as to communicate with the detection hole. A part of the ball fitted in the recess is locked in the locking hole, and the gap between the ball and the recess is A slit is formed to guide the discharge gas from the detection hole to the sensor.

ここで、ボールの周囲に均等な細隙を形成できるように、凹部を半球形に形成し、係止孔を凹部よりも小径の円形に形成するのが好ましい。また、ボールを熱収縮性材料で成形し、トラッキング現象に伴う発熱で細隙を広げ、放電ガスをセンサ側へ流れやすくする手段を採用できる。放電ガスに対するセンサの接触面積を広くするために、センサを金属板で帯状に形成し、内壁にセンサが嵌合する位置決め溝を設けるのが望ましい。   Here, it is preferable that the concave portion is formed in a hemispherical shape and the locking hole is formed in a circular shape having a smaller diameter than the concave portion so that uniform slits can be formed around the ball. Further, it is possible to adopt means for forming the ball from a heat-shrinkable material, widening the slits by heat generated by the tracking phenomenon, and facilitating the flow of the discharge gas to the sensor side. In order to increase the contact area of the sensor with the discharge gas, it is desirable to form the sensor in a strip shape with a metal plate and provide a positioning groove on the inner wall for fitting the sensor.

本発明の配線器具によれば、凹部に嵌合したボールが検出孔を塞いでいるので、ケース内側への異物が侵入し難くなり、侵入した異物をボールの回転によりケースの外側に取り出すこともできる。また、放電ガスに含まれる湿気が細隙面の広範囲に付着するため、放電電流がセンサ側へ流れやすくなる。しかも、ボールがセンサと検出孔との相対位置を固定し、細隙をセンサに直結しているので、センサの感度を高め、トラッキングの予兆を高精度に検出することができる。   According to the wiring device of the present invention, since the ball fitted in the recess blocks the detection hole, it is difficult for foreign matter to enter the inside of the case, and the foreign matter that has entered may be taken out of the case by rotation of the ball. it can. Further, since the moisture contained in the discharge gas adheres to a wide area of the slit surface, the discharge current easily flows to the sensor side. In addition, since the ball fixes the relative position between the sensor and the detection hole and the slit is directly connected to the sensor, the sensitivity of the sensor can be increased and the sign of tracking can be detected with high accuracy.

本発明の実施例1を示す電源コンセントの斜視図である。It is a perspective view of the power outlet which shows Example 1 of this invention. 電源コンセントのプラグ差込口と検出孔を示す正面図である。It is a front view which shows the plug insertion port and detection hole of a power outlet. 検出孔周辺のトラッキング検出機構を示す図2のA−A線断面図である。FIG. 3 is a cross-sectional view taken along line AA of FIG. 2 showing a tracking detection mechanism around a detection hole. トラッキング検出機構のセンサ取付構造を示す斜視図である。It is a perspective view which shows the sensor attachment structure of a tracking detection mechanism. ボールと凹部との間の細隙を示す図3のB部拡大図である。It is the B section enlarged view of FIG. 3 which shows the slit between a ball | bowl and a recessed part. ボールを熱収縮させて細隙を拡大した様子を示す断面図である。It is sectional drawing which shows a mode that the ball was heat-shrinked and the slit was expanded. 本発明の実施例2を示す差込プラグの断面図である。It is sectional drawing of the insertion plug which shows Example 2 of this invention. 差込プラグのトラッキング検出機構を示す図7のC部拡大図である。It is the C section enlarged view of FIG. 7 which shows the tracking detection mechanism of an insertion plug. 従来の電源コンセントを示す要部破断平面図である。It is a principal part fracture | rupture top view which shows the conventional power outlet.

以下、本発明の実施形態を図面に基づいて説明する。この実施形態の配線器具では、図5に示すように、ケース2の前面カバー部2aに検出孔8が形成され、放電ガスGが検出孔8を通ってケース2の外側から内側に流入する。ケース2の内壁10には位置決め溝13が形成され、位置決め溝13に金属製の帯板からなるセンサ11が嵌合され、センサ11に係止孔12が形成されている。前面カバー部2aの内面には半球形の凹部16が検出孔8と連通するように形成され、凹部16に嵌合したボール14の一部がセンサ11の係止孔12に係止されている。ボール14と凹部16との間には細隙15が形成され、放電ガスGが検出孔8から細隙15を通ってセンサ11に導かれる。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the wiring device of this embodiment, as shown in FIG. 5, the detection hole 8 is formed in the front cover portion 2 a of the case 2, and the discharge gas G flows from the outside to the inside of the case 2 through the detection hole 8. A positioning groove 13 is formed in the inner wall 10 of the case 2, a sensor 11 made of a metal band plate is fitted into the positioning groove 13, and a locking hole 12 is formed in the sensor 11. A hemispherical recess 16 is formed on the inner surface of the front cover portion 2 a so as to communicate with the detection hole 8, and a part of the ball 14 fitted in the recess 16 is locked in the locking hole 12 of the sensor 11. . A slit 15 is formed between the ball 14 and the recess 16, and the discharge gas G is guided from the detection hole 8 through the slit 15 to the sensor 11.

次に、本発明を電源コンセントに具体化した実施例1を図1〜図6に基づいて説明する。図1に示すように、この電源コンセント1では、ケース2の前面カバー部2aに2つ一組のプラグ差込口3が例えば上下に二組配設されている。プラグ差込口3の横には、トラッキングの予兆を検出したときに動作する警報ランプ4及び回路遮断器5と、動作したブザーを停止させるブザー停止ボタン6と、トラッキング検出回路の動作試験を行うテストボタン7とが設けられている。   Next, a first embodiment in which the present invention is embodied in a power outlet will be described with reference to FIGS. As shown in FIG. 1, in the power outlet 1, two sets of plug insertion ports 3 are arranged on the front cover portion 2 a of the case 2, for example, up and down. Next to the plug insertion port 3, an alarm lamp 4 and a circuit breaker 5 that operate when a sign of tracking is detected, a buzzer stop button 6 that stops the operated buzzer, and an operation test of the tracking detection circuit are performed. A test button 7 is provided.

図2、図3に示すように、2つのプラグ差込口3の間には、放電ガスをケース2の内側に導く検出孔8が形成されている。プラグ差込口3の奥には、プラグ刃体23(図7参照)を受ける受け刃9が固定され、一対の受け刃9の間に内壁10が検出孔8と相対する位置で前面カバー部2aの内面に当接するように立設されている。そして、内壁10の上端面にセンサ11が装着され、検出孔8から流入した放電ガスを検知し、検知信号(電流)を回路基板(図9参照)上のトラッキング検出回路に送信する。   As shown in FIGS. 2 and 3, a detection hole 8 that guides the discharge gas to the inside of the case 2 is formed between the two plug insertion ports 3. A receiving blade 9 that receives the plug blade body 23 (see FIG. 7) is fixed to the back of the plug insertion port 3, and the front cover portion is positioned between the pair of receiving blades 9 so that the inner wall 10 faces the detection hole 8. It stands up so that it may contact | abut to the inner surface of 2a. Then, a sensor 11 is mounted on the upper end surface of the inner wall 10, detects the discharge gas flowing in from the detection hole 8, and transmits a detection signal (current) to the tracking detection circuit on the circuit board (see FIG. 9).

図4、図5に示すように、センサ11は金属製の帯板で形成され、帯板の一部に係止孔12が形成されている。内壁10の上端面には位置決め溝13が設けられ、センサ11が位置決め溝13に嵌合した状態で内壁10と前面カバー2aとの間に挟着されている。前面カバー2aの内面には、半球形の凹部16が検出孔8に連通するように形成されている。そして、凹部16にボール14が嵌合され、ボール14の露出部がセンサ11の係止孔12に係止されている。   As shown in FIGS. 4 and 5, the sensor 11 is formed of a metal strip, and a locking hole 12 is formed in a part of the strip. A positioning groove 13 is provided on the upper end surface of the inner wall 10, and the sensor 11 is sandwiched between the inner wall 10 and the front cover 2 a in a state where the sensor 11 is fitted in the positioning groove 13. A hemispherical recess 16 is formed on the inner surface of the front cover 2 a so as to communicate with the detection hole 8. Then, the ball 14 is fitted into the recess 16, and the exposed portion of the ball 14 is locked in the locking hole 12 of the sensor 11.

係止孔12は凹部16よりも小径の円形に形成され、凹部16とボール14との間に放電ガスGを検出孔8からセンサ11に導く細隙15が形成されている。ボール14はフッ素樹脂やポリ塩化ビニル樹脂等の熱収縮性材料で成形され、図6に示すように、トラッキング現象に伴う発熱で収縮するようになっている。   The locking hole 12 is formed in a circular shape having a smaller diameter than the recess 16, and a slit 15 that guides the discharge gas G from the detection hole 8 to the sensor 11 is formed between the recess 16 and the ball 14. The ball 14 is formed of a heat-shrinkable material such as a fluororesin or a polyvinyl chloride resin, and contracts due to heat generated by the tracking phenomenon as shown in FIG.

以上のように構成された電源コンセント1によれば、次のような作用効果が得られる。
(a)ボール14で検出孔8を塞ぎ、ケース2内側への異物の侵入を抑制できる。
(b)ボール14を回転することで、侵入した異物をケース2の外側に取り出すこともでき、掃除が容易である。
(c)プラグ差込口3の間から開口部をなくし、ユーザーに安心感を与え、電源コンセント1の外観を改善できる。
According to the power outlet 1 configured as described above, the following operational effects can be obtained.
(A) It is possible to block the detection hole 8 with the ball 14 and suppress the intrusion of foreign matter into the case 2.
(B) By rotating the ball 14, the invading foreign matter can be taken out of the case 2, and cleaning is easy.
(C) It is possible to eliminate the opening from between the plug insertion ports 3 to give the user a sense of security and to improve the appearance of the power outlet 1.

(d)放電ガスGに含まれる湿気を凹部16とボール14の相対面に広く付着させ、湿気を媒体とする電流通路を細隙15の広範囲に形成できる。
(e)ボール14が検出孔8とセンサ11の相対位置を固定し、細隙15の電流通路をセンサ11に直結するため、放電電流に対するセンサ11の感度を高め、トラッキングの予兆を高精度に検出できる。
(D) Moisture contained in the discharge gas G is widely adhered to the relative surfaces of the recess 16 and the ball 14, and a current path using moisture as a medium can be formed in a wide range of the slit 15.
(E) Since the ball 14 fixes the relative position of the detection hole 8 and the sensor 11 and directly connects the current path of the slit 15 to the sensor 11, the sensitivity of the sensor 11 with respect to the discharge current is increased, and a sign of tracking is highly accurate. It can be detected.

(f)ボール14を放電ガス流によって回転させ、より多くの湿気をケース2の内側に取り込むことができる。
(g)特に、トラッキング発生時には、ボール14が熱収縮して細隙15を広げるので、放電ガス中の湿気をセンサ11へスムーズに導くことができる。
(h)センサ11が帯状に形成され、内壁10の位置決め溝13に嵌合しているので、放電ガスGとの接触面積を広げ、センサ11の感度をさらに高めることができる。
(F) The ball 14 is rotated by the discharge gas flow, so that more moisture can be taken into the case 2.
(G) In particular, when tracking occurs, the ball 14 is thermally contracted to widen the slit 15, so that moisture in the discharge gas can be smoothly guided to the sensor 11.
(H) Since the sensor 11 is formed in a band shape and is fitted in the positioning groove 13 of the inner wall 10, the contact area with the discharge gas G can be expanded, and the sensitivity of the sensor 11 can be further increased.

次に、本発明を差込プラグに具体化した実施例2を図7、図8に従って説明する。この差込プラグ21では、ケース22の前面カバー部22aから2本のプラグ刃体23が突出している。プラグ刃体23の間には検出孔24が形成され、放電ガスGが検出孔24を通ってケース22の外側から内側に流入する。ケース22の内壁25には位置決め溝28が形成され、位置決め溝28に実施例1と同様の帯状センサ26が嵌合し、センサ26に係止孔27が形成されている。   Next, a second embodiment in which the present invention is embodied as an insertion plug will be described with reference to FIGS. In the plug 21, two plug blades 23 protrude from the front cover portion 22 a of the case 22. A detection hole 24 is formed between the plug blades 23, and the discharge gas G flows from the outside of the case 22 to the inside through the detection hole 24. A positioning groove 28 is formed in the inner wall 25 of the case 22, and a belt-like sensor 26 similar to that of the first embodiment is fitted into the positioning groove 28, and a locking hole 27 is formed in the sensor 26.

前面カバー部22aの内面には半球形の凹部31が検出孔24と連通するように形成され、凹部31に嵌合したボール29の一部がセンサ26の係止孔27に係止されている。ボール29と凹部31との間には細隙30が形成され、放電ガスGが検出孔24から細隙30を通ってセンサ26へ導かれる。したがって、この差込プラグ21によっても、実施例1の電源コンセント1と同様に、ケース22内への異物の侵入を抑制できるとともに、簡単かつ安価な機構でトラッキングの予兆を高精度に検出することができる。   A hemispherical recess 31 is formed on the inner surface of the front cover portion 22 a so as to communicate with the detection hole 24, and a part of the ball 29 fitted in the recess 31 is locked in the locking hole 27 of the sensor 26. . A slit 30 is formed between the ball 29 and the recess 31, and the discharge gas G is guided from the detection hole 24 through the slit 30 to the sensor 26. Therefore, this plug 21 can suppress the intrusion of foreign matter into the case 22 as well as the power outlet 1 of the first embodiment, and can detect a sign of tracking with a simple and inexpensive mechanism with high accuracy. Can do.

なお、本発明は上記実施例1,2に限定されず、例えば、ボールを金属材料で形成したり、プラグとコンセントの両方を装備した配線器具に適用したりするなど、発明の趣旨を逸脱しない範囲で、各部の構成を適宜に変更して実施することも可能である。   In addition, this invention is not limited to the said Example 1, 2, For example, it does not deviate from the meaning of invention, such as forming a ball with a metal material and applying to the wiring apparatus equipped with both a plug and an outlet socket. It is also possible to carry out by appropriately changing the configuration of each part within the range.

1 電源コンセント
21 差込プラグ
2,22 ケース
8,24 検出孔
10,25 内壁
11,26 センサ
12,27 係止孔
13,28 位置決め溝
14,29 ボール
15,30 細隙
16,31 凹部
G 放電ガス
1 Power outlet 21 Plug 2, 22 Case 8, 24 Detection hole 10, 25 Inner wall 11, 26 Sensor 12, 27 Locking hole 13, 28 Positioning groove 14, 29 Ball 15, 30 Slit 16, 31 Recess G Discharge gas

Claims (4)

ケースに検出孔を形成し、検出孔に通して放電ガスをケースの内側に導き、ケースの内壁に放電ガスを検知するセンサを設けた配線器具において、
前記センサに係止孔を形成し、前記ケースの内面に凹部を前記検出孔と連通するように形成し、凹部に嵌合したボールの一部を係止孔に係止し、ボールと凹部との間に前記放電ガスを検出孔からセンサに導く細隙を形成したことを特徴とする配線器具。
In the wiring device provided with a sensor for detecting the discharge gas on the inner wall of the case, forming a detection hole in the case, guiding the discharge gas through the detection hole to the inside of the case,
A locking hole is formed in the sensor, a recess is formed on the inner surface of the case so as to communicate with the detection hole, a part of the ball fitted in the recess is locked in the locking hole, the ball and the recess A wiring device in which a slit for guiding the discharge gas from the detection hole to the sensor is formed in between.
前記凹部を半球形に形成し、前記係止孔を凹部よりも小径の円形に形成した請求項1記載の配線器具。   The wiring device according to claim 1, wherein the concave portion is formed in a hemispherical shape, and the locking hole is formed in a circular shape having a smaller diameter than the concave portion. 前記ボールを熱収縮性材料で成形した請求項1又は2記載の配線器具。   The wiring device according to claim 1 or 2, wherein the ball is formed of a heat-shrinkable material. 前記センサを金属製の帯板で形成し、前記内壁にセンサが嵌合する位置決め溝を設けた請求項1、2又は3記載の配線器具。   The wiring device according to claim 1, 2, or 3, wherein the sensor is formed of a metal band plate, and a positioning groove into which the sensor is fitted is provided on the inner wall.
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