JPH09149548A - Collective safety cage - Google Patents
Collective safety cageInfo
- Publication number
- JPH09149548A JPH09149548A JP30427995A JP30427995A JPH09149548A JP H09149548 A JPH09149548 A JP H09149548A JP 30427995 A JP30427995 A JP 30427995A JP 30427995 A JP30427995 A JP 30427995A JP H09149548 A JPH09149548 A JP H09149548A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- safety
- wiring board
- case
- proof
- 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.)
- Granted
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
(57)【要約】
【課題】 安全保持器のチャンネル当りの設備費と占有
スペースを節減する。
【解決手段】 ケース５内に重ねて保持された配線基板
６，６′には、それぞれｎチャンネル分の安全防爆回路
（入出力端子ａ，ｂと接地端子ｃを有する３端子回路よ
り成る）Ｎ1 〜Ｎn ，Ｎ1 ′〜Ｎn ′と、ｎ個の同軸形
の本質安全回路接続コネクタＣＮ1 〜ＣＮn （ＣＮ1 ′
〜ＣＮn ′）と、安全防爆回路を一般回路の信号線に接
続するｎ個の端子を収容した多端子形の一般回路接続コ
ネクタＴ，Ｔ′と、安全防爆回路の各接地端子を一括し
て外部に接続する共通接地端子ｇ，ｇ′とが実装され
る。コネクタＮi ，Ｔ等の相手側コネクタと接続する端
部はケースの一面より外部に突出されている。共通接地
端子ｇ，ｇ′を外部の共通電位点に接続する本質安全接
地端子Ｇ，Ｇ′がケース５に取付けられる。ｇとＧ及び
ｇ′とＧ′はリード線７，７′でそれぞれ接続される。
なお、基板上の安全防爆回路は絶縁材でコーティングさ
れる。
(57) [Abstract] [PROBLEMS] To reduce equipment cost and occupied space per channel of a safety cage. SOLUTION: A wiring board 6, 6'which is held in a case 5 in an overlapping manner is provided with a safety explosion-proof circuit (consisting of a three-terminal circuit having input / output terminals a and b and a ground terminal c) N for n channels respectively. 1 to N n and N 1 ′ to N n ′ and n coaxial type intrinsically safe circuit connecting connectors CN 1 to CN n (CN 1 ′)
To CN n ′), a multi-terminal type general circuit connector T, T ′ that accommodates n terminals for connecting the safety explosion-proof circuit to the signal line of the general circuit, and each ground terminal of the safety explosion-proof circuit Common ground terminals g and g ′ connected to the outside are mounted. The ends of the connectors Ni , T, etc., which are connected to the mating connectors, are projected outward from one surface of the case. Intrinsically safe grounding terminals G and G ', which connect the common grounding terminals g and g'to an external common potential point, are attached to the case 5. g and G and g'and G'are connected by lead wires 7 and 7 ', respectively.
The safety explosion-proof circuit on the board is coated with an insulating material.
Description
【０００１】[0001]
【発明の属する技術分野】この発明は安全保持器に関
し、特にチャンネル当りのコスト及びスペースを節減し
た集合形安全保持に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device, and more particularly to a collective safety device that saves cost and space per channel.
【０００２】[0002]
【従来の技術】図２に示すように、例えば液面計１のよ
うな一般電気回路より導出された信号線Ｌ1 ，Ｌ2 ，
…，Ｌn を爆発の危険性のある場所（以下危険場所と言
う）、例えば石油貯蔵タンク２に設置された例えば複数
の液位センサ３などの電気回路または素子より導出され
た信号線Ｍ1 ，Ｍ2 ，…，Ｍn とそれぞれ接続する場合
に、その危険場所の手前に安全保持器４1 ，４2 ，…，
４n を設置し、信号線ＬiとＭi （ｉ＝１〜ｎ）とを安
全保持器４i （ｉ＝１〜ｎ）を介して接続し、危険場所
の信号線Ｍ1 〜Ｍn に流れる電流／電圧を制限して安全
を図っている。2. Description of the Related Art As shown in FIG. 2, signal lines L 1 , L 2 , derived from a general electric circuit such as a liquid level gauge 1,
, L n is a place where there is a risk of explosion (hereinafter referred to as a dangerous place), for example, a signal line M 1 derived from an electric circuit or element such as a plurality of liquid level sensors 3 installed in the oil storage tank 2. , M 2, ..., M n and to connect respectively, the front of the hazardous area to a safe cage 4 1, 4 2, ...,
4 n are installed, the signal lines L i and M i (i = 1 to n) are connected via the safety cage 4 i (i = 1 to n), and the signal lines M 1 to M n in the hazardous area are connected. The current / voltage that flows to the device is limited to ensure safety.
【０００３】この安全保持器４はタバコ２０本入りケー
ス程度の大きさで、図３Ａに示すような外観をもち、ケ
ース５の一面に一般回路接続端子Ｔ、本質安全接地端子
Ｇ及びこの安全保持器を危険場所の信号線に接続するた
めの同軸形の本質安全回路接続コネクタＣＮが取付けら
れている。ケース５内には図３Ｂに示すように、ａ，
ｂ，ｃの３端子をもつ安全防爆回路Ｎが収容される。該
回路Ｎは例えば入出力端子ａ，ｂ間に直列に接続された
抵抗器Ｒ及びヒューズＦと、それらＲ，Ｆの接続点と接
地端子ｃとの間に直列に接続された４個のツェナーダイ
オードＤZ で構成される。This safety holder 4 is about the size of a case containing 20 cigarettes and has an appearance as shown in FIG. 3A. On one surface of the case 5, there are a general circuit connection terminal T, an intrinsically safe ground terminal G and this safety holder. A coaxial type intrinsically safe circuit connector CN for connecting the instrument to the signal line in the hazardous area is attached. In the case 5, as shown in FIG. 3B, a,
A safety explosion-proof circuit N having three terminals b and c is accommodated. The circuit N is, for example, a resistor R and a fuse F connected in series between the input / output terminals a and b, and four Zeners connected in series between the connection point of the R and F and the ground terminal c. It is composed of a diode D Z.
【０００４】端子ａ，ｂ及びｃはケース５に取付けられ
たコネクタＣＮ、端子Ｔ、本質安全接地端子Ｇにそれぞ
れ接続される。The terminals a, b and c are respectively connected to the connector CN, the terminal T and the intrinsically safe ground terminal G mounted on the case 5.
【０００５】[0005]
【発明が解決しようとする課題】従来の安全保持器は１
チャンネル当り、つまり互いに接続すべき一組の信号線
（Ｌi ，Ｍi ）当り１個必要とするので、チャンネル数
が多い場合には、大きなスペースが必要になると共にそ
の設備費も多額になる問題があった。この発明の目的
は、安全保持器のチャンネル当りの設備費と占有スペー
スを大幅に節減しようとするものである。The conventional safety retainer has one
One channel is required for each channel, that is, one pair of signal lines (L i , M i ) to be connected to each other. Therefore, when the number of channels is large, a large space is required and the equipment cost is large. There was a problem. The object of the present invention is to significantly reduce the equipment cost and occupied space per channel of the safety cage.
【０００６】[0006]
（１）請求項１の集合形安全保持器は、ケースと、その
ケース内に保持された配線基板と、その配線基板に実装
されたｎ（２以上の整数）チャンネル分の安全防爆回路
（２つの入出力端子と接地端子を有する３端子回路より
成り、爆発の危険性のある場所（以下危険場所と言う）
の信号線の電圧／電流を制限するための回路）と、配線
基板に実装され、各安全防爆回路の一方の入出力端子を
それぞれ危険場所の信号線に接続するｎ個の同軸形の本
質安全回路接続コネクタと、配線基板に実装され、各安
全防爆回路の他方の入出力端子を一般回路の信号線にそ
れぞれ接続するｎ個の端子を収容した多端子形の一般回
路接続コネクタと、配線基板に設けられ、ｎ個の安全防
爆回路の各接地端子を一括して外部に接続する共通接地
端子と、ケースに取付けられ、共通接地端子を外部の共
通電位点に接続する本質安全接地端子とにより構成され
る。(1) In the collective safety holder according to claim 1, a case, a wiring board held in the case, and a safety explosion-proof circuit for n (integer of 2 or more) channels mounted on the wiring board (2 It consists of a three-terminal circuit with two input / output terminals and a ground terminal, and is a place where there is a risk of explosion (hereinafter referred to as "hazardous place").
Circuit for limiting the voltage / current of the signal line), and n coaxial type intrinsic safety that is mounted on the wiring board and connects one input / output terminal of each safety explosion-proof circuit to the signal line in the hazardous area. A circuit connection connector, a multi-terminal type general circuit connection connector which is mounted on a wiring board and accommodates n terminals for connecting the other input / output terminal of each safety explosion-proof circuit to a signal line of the general circuit, and a wiring board , A common ground terminal that collectively connects the ground terminals of the n safety explosion-proof circuits to the outside, and an intrinsically safe ground terminal that is attached to the case and connects the common ground terminal to an external common potential point. Composed.
【０００７】（２）請求項２の発明は、前記（１）にお
いて、ｎチャンネル分の安全防爆回路を実装した配線基
板をｍ（２以上の整数）個多段に重ねてケースに収容
し、各配線基板に設けた共通接地端子と相互に接続する
２個以上の本質安全接地端子をケースに取付けたもので
ある。 （３）請求項３の発明は、前記（１）において、配線基
板に実装された安全防爆回路が、絶縁材でコーティング
されているものである。(2) According to the invention of claim 2, in the above-mentioned (1), m (integer of 2 or more) wiring boards in which n channels of safety explosion-proof circuits are mounted are stacked in a multi-stage and housed in a case. Two or more intrinsically safe ground terminals connected to a common ground terminal provided on a wiring board are attached to a case. (3) In the invention of claim 3, in the above (1), the safety explosion-proof circuit mounted on the wiring board is coated with an insulating material.
【０００８】[0008]
【発明の実施の形態】図１の実施例を参照してこの発明
の実施の形態を説明する。図１には図３と対応する部分
に同じ符号を付けてある。例えば金属製のケース５内に
配線基板６，６′が２段（一般には多段）に重ねて保持
される。各配線基板６（６′）には、ｎ（２以上の整
数）チャンネル分の安全防爆回路（例えば図３Ｂに示す
ように２つの入出力端子ａ，ｂと接地端子ｃを有する３
端子回路より成る）Ｎ1 〜Ｎn （Ｎ1 ′〜Ｎn ′）と、
ｎ個の同軸形の本質安全回路接続コネクタＣＮ1 〜ＣＮ
n （ＣＮ1 ′〜ＣＮn ′）と、それら安全防爆回路を一
般回路の信号線に接続するｎ個の端子を収容した多端子
形の一般回路接続コネクタＴ（Ｔ′）とが実装される。
該コネクタＣＮi ，ＣＮi ′及びＴ，Ｔ′の相手側コネ
クタと接続する端部は図３ＡのコネクタＣＮと同様に、
ケース５の一面に形成された孔より外部に突出されてい
る。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the embodiment shown in FIG. In FIG. 1, parts corresponding to those in FIG. 3 are denoted by the same reference numerals. For example, the wiring boards 6 and 6'are held in a two-tiered (generally multi-tiered) manner in a metal case 5. Each wiring board 6 (6 ') has a safety explosion-proof circuit for n (integer of 2 or more) channels (for example, two input / output terminals a and b and a ground terminal c as shown in FIG. 3B).
Terminal circuits) N 1 to N n (N 1 ′ to N n ′),
n coaxial type intrinsically safe circuit connection connectors CN 1 to CN
n (CN 1 ′ to CN n ′) and a multi-terminal type general circuit connection connector T (T ′) accommodating n terminals for connecting the safety explosion-proof circuit to the signal line of the general circuit are mounted. .
The ends of the connectors CN i , CN i ′ and T, T ′ that connect to the mating connector are the same as the connector CN of FIG. 3A.
It projects outside through a hole formed on one surface of the case 5.
【０００９】ｎ個の安全防爆回路Ｎ1 〜Ｎn （Ｎ1 ′〜
Ｎn ′）の各接地端子ｃを一括して外部に接続する共通
接地端子ｇ（ｇ′）が配線基板６（６′）の端縁の近傍
に設けられる。またこれら共通接地端子ｇ（ｇ′）を外
部の共通電位点に接続する共通の本質安全接地端子Ｇ
（Ｇ′）がケース５に取付けられる。配線基板６
（６′）の接地端子ｇ（ｇ′）と接地端子２Ｇ（Ｇ′）
とはリード線７（７′）でそれぞれ接続されている。N safety explosion-proof circuits N 1 to N n (N 1 '
N n ') the common ground terminal g to be connected to an external collectively each ground terminal c of (g') is provided in the vicinity of the edge of the wiring substrate 6 (6 '). A common intrinsic safety ground terminal G for connecting these common ground terminals g (g ') to an external common potential point.
(G ′) is attached to the case 5. Wiring board 6
(6 ') ground terminal g (g') and ground terminal 2G (G ')
Are connected to each other by a lead wire 7 (7 ').
【００１０】この発明ではチャンネル当りの安全保持器
の小形化と経済化を図るため上述のように１つのケース
に複数の安全防爆回路を集合実装しているが、そのいっ
そうの小形化を進めるため、配線基板に実装された安全
防爆回路にポリウレタンなどの絶縁材をコーティングし
て、配線相互の間隔をコーティングしない場合よりかな
り小さく（例えば３ｍｍの間隔を１ｍｍ程度に）して、
高密度実装を行い配線基板６，６′の寸法をできるだけ
小さくしている。According to the present invention, a plurality of safety explosion-proof circuits are collectively mounted in one case as described above in order to miniaturize the safety cage per channel and to make it economical, but to further miniaturize it. , The safety explosion-proof circuit mounted on the wiring board is coated with an insulating material such as polyurethane, and the distance between the wirings is made considerably smaller than that when it is not coated (for example, the distance of 3 mm is set to about 1 mm),
High-density mounting is performed to reduce the dimensions of the wiring boards 6 and 6'as much as possible.
【００１１】[0011]
【発明の効果】以上述べたように、従来１チャンネルご
とに独立した安全保持器を取付けていたのに対して、こ
の発明では１つのケース内にｎチャンネル分の安全防爆
回路を実装した配線基板を１乃至複数枚重ねて収容した
ので、安全保持器のチャンネル当りの設備費と占有スペ
ースを従来より大幅に低減することができる。As described above, an independent safety retainer is attached to each channel in the related art, whereas in the present invention, a wiring board having a safety explosion-proof circuit for n channels mounted in one case. Since one or more sheets of the safety cage are stacked and accommodated, the facility cost and occupied space per channel of the safety cage can be significantly reduced as compared with the conventional case.
【００１２】また配線基板に実装された安全防爆回路に
絶縁材をコーティングした場合にはよりいっそうの小形
化が可能となる。Further, when the safety explosion-proof circuit mounted on the wiring board is coated with an insulating material, the size can be further reduced.
【図１】この発明の実施例を示す図で、Ａは斜視図、Ｂ
は原理的なブロック図。FIG. 1 is a view showing an embodiment of the present invention, wherein A is a perspective view, and B is
Is a basic block diagram.
【図２】安全保持器を設備した液位測定系の一例を示す
ブロック図。FIG. 2 is a block diagram showing an example of a liquid level measuring system equipped with a safety holder.
【図３】従来の安全保持器を示す図で、Ａは斜視図、Ｂ
は回路図。FIG. 3 is a view showing a conventional safety retainer, where A is a perspective view and B is a perspective view.
Is a circuit diagram.
Claims (3)
ル分の安全防爆回路（２つの入出力端子と接地端子を有
する３端子回路より成り、爆発の危険性のある場所（以
下危険場所と言う）の信号線の電圧／電流を制限するた
めの回路）と、 前記配線基板に実装され、前記各安全防爆回路の一方の
入出力端子をそれぞれ危険場所の信号線に接続するｎ個
の同軸形の本質安全回路接続コネクタと、 前記配線基板に実装され、前記各安全防爆回路の他方の
入出力端子を一般回路の信号線にそれぞれ接続するｎ個
の端子を収容した多端子形の一般回路接続コネクタと、 前記配線基板に設けられ、前記ｎ個の安全防爆回路の各
接地端子を一括して外部に接続する共通接地端子と、 前記ケースに取付けられ、前記共通接地端子を外部の共
通電位点に接続する本質安全接地端子と、を具備するこ
とを特徴とする集合形安全保持器。1. A case, a wiring board held in the case, and a safety explosion-proof circuit for n (integer of 2 or more) channels mounted on the wiring board (having two input / output terminals and a ground terminal). A circuit for limiting the voltage / current of a signal line at a place where there is a risk of explosion (hereinafter referred to as a dangerous place) consisting of a three-terminal circuit, and one of the safety explosion-proof circuits mounted on the wiring board. N coaxial type intrinsically safe circuit connecting connectors for connecting the input / output terminals of the respective safety explosion-proof circuits to the signal lines of the general circuit. A multi-terminal type general circuit connection connector accommodating n terminals respectively connected to the wires, and a common ground which is provided on the wiring board and collectively connects each ground terminal of the n safety explosion-proof circuits to the outside. The terminal, and An intrinsic safety ground terminal, which is attached to a case, and which connects the common ground terminal to an external common potential point.
記安全防爆回路を実装した前記配線基板をｍ（２以上の
整数）個多段に重ねて前記ケースに収容し、各配線基板
に設けられた共通接地端子と相互に接続する２個以上の
本質安全接地端子を前記ケースに取付けたことを特徴と
する集合形安全保持器。2. The wiring board on which the safety explosion-proof circuit for n channels is mounted is stacked in multiple stages of m (an integer of 2 or more) in the case and is provided in each wiring board. A collective safety cage, wherein two or more intrinsically safe ground terminals that are mutually connected to a common ground terminal are attached to the case.
された安全防爆回路が、絶縁材でコーティングされてい
ることを特徴とする集合形安全保持器。3. The collective safety cage according to claim 1, wherein the safety explosion-proof circuit mounted on the wiring board is coated with an insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7304279A JP3030393B2 (en) | 1995-11-22 | 1995-11-22 | Collective safety cage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7304279A JP3030393B2 (en) | 1995-11-22 | 1995-11-22 | Collective safety cage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09149548A true JPH09149548A (en) | 1997-06-06 |
| JP3030393B2 JP3030393B2 (en) | 2000-04-10 |
Family
ID=17931129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7304279A Expired - Fee Related JP3030393B2 (en) | 1995-11-22 | 1995-11-22 | Collective safety cage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3030393B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911968A (en) * | 2016-05-26 | 2016-08-31 | 滨州新大新机电科技有限公司 | Analog input-type safety barrier and isolator bottom plate |
-
1995
- 1995-11-22 JP JP7304279A patent/JP3030393B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911968A (en) * | 2016-05-26 | 2016-08-31 | 滨州新大新机电科技有限公司 | Analog input-type safety barrier and isolator bottom plate |
| CN105911968B (en) * | 2016-05-26 | 2019-03-19 | 滨州新大新机电科技有限公司 | A kind of analog input type guard grating, isolator bottom plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3030393B2 (en) | 2000-04-10 |
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