JP2004044935A

JP2004044935A - Engine driving type air conditioner

Info

Publication number: JP2004044935A
Application number: JP2002204013A
Authority: JP
Inventors: Tomohiko Kato; 加藤　智彦
Original assignee: Aisin Seiki Co Ltd
Current assignee: Aisin Corp
Priority date: 2002-07-12
Filing date: 2002-07-12
Publication date: 2004-02-12
Anticipated expiration: 2022-07-12
Also published as: KR100545278B1; KR20040007349A; JP3891060B2

Abstract

<P>PROBLEM TO BE SOLVED: To connect an engine driving type air conditioner to both of a single-phase power source and a three-phase power source without generating short-circuiting in misconnection. <P>SOLUTION: This engine driving-type air conditioner comprises a power source terminal board 10 comprising a first terminal 11, a second terminal 12 and a third terminal 13, a first load group 1 connected to the first terminal 11 at its one end, a second load group 2 connected to the second terminal 12 at its one end, and a third load group 3 connected between the first terminal 11 and the second terminal 12. When connecting to the single-phase power source, the first terminal 11 and the second terminal 12 are connected to the power source, the other end of the first load group 1 is connected to the second terminal 12, and the other end of the second load group is connected to the first terminal 11, and when connecting to the three-phase power source, the first terminal 11, the second terminal 12 and the third terminal 13 are connected to the power source, and the other end of the first load group and the other end of the second load group 2 are connected to the third terminal 13. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明はエンジン駆動式空気調和装置に関する。
【０００２】
【従来の技術】
エンジン駆動式空気調和装置は、エンジンによって冷媒回路中のコンプレッサを回転させて冷暖房する空気調和装置である。エンジン駆動式空気調和装置には、エンジン、室外熱交換器などが備えられた室外機と、室内熱交換器などが備えられた室内機が設けられている。室外機において、コンプレッサはエンジンによって駆動されるが、熱交換器ファンモータ、冷却水ポンプモータなどは電源が必要である。電源は経済的理由によって三相電源に接続される場合が多い。
【０００３】
しかし、使用者によっては単相電源しか用意されていなく、この場合、新規に三相電源を設備することはかえってコスト高となる。このため、三相電源にも単相電源にも接続できるエンジン駆動式空気調和装置が求められていた。熱交換器ファンモータ、冷却水ポンプモータなどを単相仕様とし、三相電源接続時には、三線のうちの二線に接続することが考えられるが、不平衡負荷状態になることを避ける必要がある。
【０００４】
従来技術として、特開平０５−３１７８６１号公報に、エンジン駆動式空気調和装置の室外機において、熱交ファンと冷却水ポンプの駆動モータを単相モータとし、その電源を単相と三相の両方に接続可能とするために、単相と三相の切替を端子台への配線あるいはスイッチの切替あるいはＳ相−Ｔ相間の電圧の有無を検知してリレーの切替により行うことが開示されている。
【０００５】
【発明が解決しようとする課題】
しかしながら、従来技術の端子台への配線による切替あるいはスイッチの切替による方法では、三相電源接続時に誤って切替手段を単相側に設定すると、電源が線間短絡状態になり、短絡電流により電源設備を含め破損等の悪影響を与えることになる。逆に単相電源接続時に誤って切替手段を三相側に設定すると、供給電源に接続されている単相モータ以外には電源が供給されないことになり、動作不良を起こすことになる。また、この方法では切替手段を設定間違いした場合の検出方法がなく、実際電源投入し機能不良や電源設備に悪影響を与えた後に間違いが発見されることになる。
【０００６】
一方、従来技術のＳ相−Ｔ相間の電圧の有無を検知してリレーの切替により行う方法では、間違いなく自動的に切替接続することができるが、電源投入前は単相側に切替接点が接続されており、電源投入しＳ相−Ｔ相間の電圧を検知すると三相側に切り替わるため、この間の相間短絡防止からタイマーリレーを必要とするなど、非常にコストが高くなる問題点がある。
【０００７】
本発明は上記課題を解決したもので、誤接続時の短絡が発生することがない、単相電源にも三相電源にも接続できる低コストなエンジン駆動式空気調和装置を提供する。
【０００８】
【課題を解決するための手段】
上記技術的課題を解決するために、本発明の請求項１において講じた技術的手段（以下、第１の技術的手段と称する。）は、第１端子、第２端子および第３端子を備えた電源端子台と、前記電源端子台の第１端子に一方が接続された第１負荷群と、前記電源端子台の第２端子に一方が接続された第２負荷群と、前記電源端子台の第１端子と第２端子の間に接続された第３負荷群とが設けられ、単相電源接続時には前記電源端子台の第１端子、第２端子が前記単相電源に接続され、三相電源接続時には前記電源端子台の第１端子、第２端子および第３端子が前記三相電源に接続されるとともに、前記単相電源接続時には前記第１負荷群の他方が前記電源端子台の第２端子に接続されかつ前記第２負荷群の他方が前記電源端子台の第１端子に接続され、前記三相電源接続時には前記第１負荷群の他方および前記第２負荷群の他方が前記電源端子台の第３端子に接続される切替手段が設けられていることを特徴とするエンジン駆動式空気調和装置である。
【０００９】
上記第１の技術的手段による効果は、以下のようである。
【００１０】
すなわち、単相電源接続時に第１負荷群の他方が電源端子台の第２端子に接続されかつ第２負荷群の他方が電源端子台の第１端子に接続されるので、すべての負荷群を単相電源に接続することができる。このとき間違えて切替手段を三相電源接続時の状態に切り替えても、第１負荷群、第２負荷群はいずれも電源が接続されていない電源端子台の第３端子に接続されるだけであるので、短絡が生ずることはない。
【００１１】
一方、三相電源接続時には第１負荷群の他方および第２負荷群の他方が電源端子台の第３端子に接続されるので、第１負荷群、第２負荷群、第３負荷群がそれぞれ三相電源の異なる相間に接続されるため、負荷バランスを取ることで不平衡負荷の問題は生じない。このとき間違えて切替手段を単相電源接続時の状態に切り替えても、第１負荷群、第２負荷群も電源端子台の第１端子と第２端子の間に接続されるので、すべての負荷群が同じ相間に接続されるが、短絡が生じることはない。
【００１２】
したがって、三相電源接続時にも、単相電源接続時にも、誤接続時の短絡が発生することがなく、接続することができる。
【００１３】
上記技術的課題を解決するために、本発明の請求項２において講じた技術的手段（以下、第２の技術的手段と称する。）は、前記第１負荷群の他方が接続された第１端子および第２負荷群の他方が接続された第２端子を備えた第１コネクタと、前記電源端子台の第２端子に接続された第１端子および前記電源端子台の第１端子に接続された第２端子を備えた第２コネクタと、前記電源端子台の第３端子に共に接続された第１端子および第２端子を備えた第３コネクタが設けられ、前記切替手段が、前記単相電源接続時には前記第１コネクタの第１端子と前記第２コネクタの第１端子および前記第１コネクタの第２端子と前記第２コネクタの第２端子が接続されるように前記第１コネクタと前記第２コネクタを接続し、前記三相電源接続時には前記第１コネクタと前記第３コネクタを接続される第１コネクタ、第２コネクタおよび第３コネクタであることを特徴とする請求項１記載のエンジン駆動式空気調和装置である。
【００１４】
上記第２の技術的手段による効果は、以下のようである。
【００１５】
すなわち、コネクタの接続切替だけで三相時か単相時かの切替を行っているので、タイマーリレーなどを使用する必要がないため低コストである。
【００１６】
上記技術的課題を解決するために、本発明の請求項３において講じた技術的手段（以下、第３の技術的手段と称する。）は、前記切替手段の切替状態を検知する第１検知手段と、前記電源端子台に接続されている電源が単相か三相かを検知する第２検知手段が設けられていることを特徴とする請求項１または請求項２に記載のエンジン駆動式空気調和装置である。
【００１７】
上記第３の技術的手段による効果は、以下のようである。
【００１８】
すなわち、第２検知手段によって電源端子台が三相電源に接続されているか単相電源に接続されているか検知でき、かつ第１検知手段によって切替手段が三相接続時の切替状態か単相接続時の切替状態か検知できるので、第１検知手段と第２検知手段の検知結果を比較することによって設定間違いを認識でき、設定間違いを修正できる。これにより、三相電源の１つの相間だけを使用し電源設備にダメージを与えたり、単相電源で欠相する負荷が発生するような不具合をなくすことができる。
【００１９】
上記技術的課題を解決するために、本発明の請求項４において講じた技術的手段（以下、第４の技術的手段と称する。）は、第１検知手段によって検知された前記切替手段の切替状態が前記第２検知手段で検知された電源の種類に対応していない場合に警報を発信する警報手段が設けられていることを特徴とする請求項３記載のエンジン駆動式空気調和装置である。
【００２０】
上記第４の技術的手段による効果は、以下のようである。
【００２１】
すなわち、第１検知手段と第２検知手段の検知結果を比較して切替手段の切替設定間違いを警報手段が警報するので、作業者は確実に設定間違いを認識でき、直ちに設定間違いを修正できる。
【００２２】
【発明の実施の形態】
本発明者は、従来技術において、誤接続時に相間短絡が発生したり、Ｓ相−Ｔ相間の電圧の有無を検知して自動切替を行う場合にタイマーリレーが必要になる理由を考察した。その理由は、Ｔ相を単相供給電源時にＲ相と短絡接続することで三相―単相の切替を行っているためである。
【００２３】
本発明者は、上記の問題点を解決すべく鋭意研究し本発明に至った。電源端子台に供給電源が三相の場合に接続する第１端子、第２端子、第３端子を設け、供給電源が単相の場合は電源端子台の第１端子と第２端子に単相電源を接続する構成とする。負荷を、三相電源接続時に不平衡負荷が生じないように、第１端子と第３端子の間に接続される第１負荷群、第２端子と第３端子の間に接続される第２負荷群、第１端子と第２端子の間に接続される第３負荷群に分ける。そして第１負荷群、第２負荷群の第３端子側接続をはずせるようにし、供給電源が単相の場合、第１負荷群の第３端子側を第２端子に、第２負荷群のの第３端子側を第１端子に接続できるようにする。この結果、三相電源接続時に不平衡負荷を生ずることなく単相電源にも三相電源にも接続でき、誤接続時の短絡をなくすことができる。タイマーリレーなどを使用していないので、低コストで単相電源にも三相電源にも接続できる装置となる。
【００２４】
以下、図を用いて本発明を詳しく説明する。図１は本発明の単相電源接続時について説明する説明図であり、図２は本発明の三相電源接続時について説明する説明図である。
【００２５】
電源端子台１０には第１端子１１、第２端子１２、第３端子１３が設けられている。モータなどの負荷は、第１負荷群１、第２負荷群２および第３負荷群３の３つのグループに分かれている。三相電源接続時に、第１負荷群１、第２負荷群２、第３負荷群３は互いに異なる相間に接続されるが、このとき不平衡負荷が生じないように第１負荷群１、第２負荷群２、第３負荷群３がグループ分けされている。
【００２６】
第１負荷群１の一方は電源端子台１０の第１端子１１に接続され、他方は端子２１に接続されている。第２負荷群２の一方は電源端子台１０の第２端子１２に接続され、他方は端子２２に接続されている。第３負荷群３の一方は電源端子台１０の第１端子１１に接続され、他方は電源端子台１０の第２端子１２に接続されている。すなわち第３負荷群３は電源端子台１０の第１端子１１と第２端子１２の間に接続されている。端子３１は電源端子台１０の第２端子１２に接続され、端子３２は電源端子台１０の第１端子１１に接続されている。端子４１および端子４２は共に電源端子台１０の第３端子１３に接続されている。
【００２７】
単相電源接続時には図１のように、電源端子台１０の第１端子１１と第２端子１２に単相電源１００が接続される。同時に端子２１と端子３１が接続され、端子２２と端子３２が接続される。こうして、　第１負荷群１の他方が電源端子台１０の第２端子１２に接続され、かつ第２負荷群２の他方が電源端子台１０の第１端子１１に接続され、第１負荷群１、第２負荷群２はともに電源端子台１０の第１端子１１と第２端子１２の間に接続される。この結果、すべての負荷が単相電源に接続される。
【００２８】
三相電源接続時には図２のように、電源端子台１０のすべての端子に三相電源２００が接続される。例えば、第１端子１１、第２端子１２、第３端子１３には、それぞれ三相電源２００のＲ相、Ｓ相、Ｔ相が接続される。同時に同時に端子２１と端子４１が接続され、端子２２と端子４２が接続される。こうして、第１負荷群１の他方および第２負荷群２の他方は共に電源端子台１０の第３端子１３に接続される。この結果、第１負荷群１、第２負荷群２、第３負荷群３は、それぞれ三相電源２００の互いに異なる相間に接続される。図２では、第１負荷群１はＲ相−Ｔ相間に接続され、第２負荷群２はＳ相−Ｔ相間に接続され、第３負荷群３はＲ相−Ｓ相間に接続される。したがって、不平衡負荷の問題が生じることはない。
【００２９】
端子２１を端子３１または端子４１に接続する、端子２２を端子３２または端子４２に接続する切替手段としては、図３に示すコネクタによる方法、図４に示す切替スイッチによる方法などがある。
【００３０】
図３はコネクタを切替手段として使用した場合の説明図である。端子２１と端子２２は第１コネクタ２０に設けられている。端子３１と端子３２は第２コネクタ３０に設けられている。端子４１と端子４２は第３コネクタ４０に設けられている。これらの端子および各負荷群の接続は図１や図２と同じである。
【００３１】
単相電源接続時には、端子２１と端子３１が接続され、端子２２と端子３２が接続されるように第１コネクタ２０と第２コネクタ３０を接続する。一方、三相電源接続時には、端子２１と端子４１が接続され、端子２２と端子４２が接続されるように第１コネクタ２０と第３コネクタ４０を接続する。これらのコネクタは端子が逆に接続されない構造になっている。
【００３２】
図４は切替スイッチを切替手段として使用した場合の説明図である。切替スイッチ５０は、端子２１と端子３１、端子２２と端子３２を接続するか、端子２１と端子４１、端子２２と端子４２を接続するかを切り替えるスイッチである。これらの端子および各負荷群の接続は図１や図２と同じである。切替スイッチ５０を切り替えることによって、単相電源接続時には端子２１と端子３１が接続され、かつ端子２２と端子３２が接続される。一方、三相電源接続時には端子２１と端子４１が接続され、かつ端子２２と端子４２が接続される。
【００３３】
本発明において、単相電源接続時に、間違えて切替手段を三相電源時側に切り替えた場合、第１負荷群１、第２負荷群２はいずれも電源が接続されていない第３端子１３に接続されるだけであるので、電流が流れないだけで短絡が生ずることはない。このときは第１負荷群１、第２負荷群２が起動しないため作業者は直ちに間違いに気がつく。一方、三相電源接続時に、間違えて切替手段を単相電源時側に切り替えた場合、第１端子２１がＳ相に接続され、第２端子２２がＴ相に接続され、この結果すべての負荷群に同じＲ相−Ｓ相間の電流が流れる問題は生ずるが、短絡が生じることはない。
【００３４】
以下、本発明の実施例について、図面に基づいて説明する。図５は本発明の実施例のエンジン駆動式空気調和装置室外機の回路図である。図１〜４に説明に対応する部材には同じ符号を使用した。また図５においては、図に煩雑化を防ぐため配線の電気的接続点を黒点で表示している。黒点がない配線の交差点は電気的な接続はされていない。
【００３５】
実施例の室外機の回路は、電源端子台１０、第１コネクタ２０、第２コネクタ３０、、第３コネクタ４０、熱交換器ファンモータ（以後、ファンモータと称する）５１、５４、５６、ガス電磁弁５２、電磁弁５３、冷却水ポンプモータ５５、スタータモータ５７、コンプレッサクラッチ５８、リレー６１〜６８、トランス７６、７７、整流回路７９および制御系ユニット３００などから構成されている。制御系ユニット３００は、電源回路７８、コントローラ８０、フォトカプラ７１、７２、トランジスタ７３、表示器７４、７５などから構成されている。これらの構成部品は図１のように配線によって接続されている。電磁弁５３は、オイルバイパス弁、冷媒弁などのガス電磁弁５２以外の電磁弁を代表している。
【００３６】
電源端子台１０には第１端子１１、第２端子１２、第３端子１３が設けられ、交流２００Ｖ単相電源または交流２００Ｖ三相電源が接続される。単相電源は第１端子１１と第２端子１２に接続される。三相電源を接続するときには第１端子１１にＲ相、第２端子１２にＳ相、第３端子１３にＴ相が接続される。
【００３７】
第１コネクタ２０には第１端子２１、第２端子２２、第３端子２３が設けられている。第２コネクタ３０には第１端子３１、第２端子３２、第３端子３３が設けられている。第３コネクタ４０には第１端子４１、第２端子４２、第３端子４３が設けられている。
【００３８】
ファンモータ５１、ガス電磁弁５２、電磁弁５３、制御系ユニット３００は第３負荷群３を構成している負荷である。ファンモータ５１、ガス電磁弁５２、電磁弁５３はそれぞれリレー６１、６２、６３を介して電源端子台１０の第１端子１１と第２端子１２の間に接続されている。制御系ユニット３００では、電源回路７８が制御系ユニット３００のＤＣ５Ｖ電源となっている。フォトカプラ７１、７２、トランジスタ７３、表示器７４、７５はコントローラ８０に接続されている。またリレー６１〜６８の接点をオン・オフするコイルはコントローラ８０に接続されている。制御系ユニット３００の電源回路７８はトランス７６を介して交流２００Ｖ電源に接続されている。すなわち、制御系ユニット３００の負荷はトランス７６を介して交流２００Ｖ電源に接続されており、交流２００Ｖ電源に直接接続されているのはトランス７６である。トランス７６は電源端子台１０の第１端子１１と第２端子１２の間に接続されている。
【００３９】
ファンモータ５４、冷却水ポンプモータ５５は第２負荷群２を構成している負荷である。ファンモータ５４の一方はリレー６４を介して、冷却水ポンプモータ５５の一方はリレー６５を介して電源端子台１０の第１端子１１に接続されている。ファンモータ５４と冷却水ポンプモータ５５の他方は第１コネクタ２０の第２端子２２に接続されている。
【００４０】
ファンモータ５６、スタータモータ５７、コンプレッサクラッチ５８は第１負荷群１を構成している負荷である。ファンモータ５６の一方はリレー６６を介して電源端子台１０の第２端子１２に接続され、他方は第１コネクタ２０の第１端子２１に接続されている。スタータモータ５７、コンプレッサクラッチ５８はトランス７７、整流回路７９を介して交流２００Ｖ電源に接続されているＤＣ１２Ｖ系負荷であり、交流２００Ｖ電源に直接接続されているのはトランス７７である。トランス７７の一方は電源端子台１０の第２端子１２に接続され、他方は第１コネクタ２０の第１端子２１に接続されている。スタータモータ５７、コンプレッサクラッチ５８は、それぞれリレー６７、６８を介して整流回路７９に接続されている。
【００４１】
第１負荷群１、第２負荷群２、第３負荷群３の負荷はいずれも単相負荷である。第１負荷群１、第２負荷群２、第３負荷群３は、負荷のそれぞれの合計が互いに同じくらいの大きさになるように選択されている。
【００４２】
第１コネクタ２０の第３端子２３は抵抗を介してトランジスタ７３のベースに接続されている。トランジスタ７３のコレクタはコントローラ８０および抵抗を介して電源回路７８の電源電位（Ｖｄｄ）に接続されている。トランジスタ７３のエミッタはアースされている。
【００４３】
第２コネクタ３０の第１端子３１は電源端子台１０の第１端子１１に接続されている。第２コネクタ３０の第２端子３２は電源端子台１０の第２端子１２に接続されている。第２コネクタ３０の第３端子３３は電源回路７８の電源電位（Ｖｄｄ）に接続されている。
【００４４】
第３コネクタ４０の第１端子４１と第２端子４２は、いずれも電源端子台１０の第３端子１３に接続されている。第３コネクタ４０の第３端子４３はアースされている。
【００４５】
フォトカプラ７１、７２は発光ダイオードと受光トランジスタからなるフォトカプラである。フォトカプラ７１の発光ダイオードは電源端子台１０の第１端子１１と第２端子１２の間に接続されている。フォトカプラ７２の発光ダイオードは電源端子台１０の第２端子１２と第３端子１３の間に接続されている。フォトカプラ７１、７２の受光トランジスタのコレクタはいずれもコントローラ８０および抵抗を介して電源回路７８の電源電位（Ｖｄｄ）に接続されている。フォトカプラ７１、７２の受光トランジスタのエミッタはいずれもアースされている。
実施例の室外機を三相電源に接続するときには、作業者が三相電源のＲ相、Ｓ相、Ｔ相を、それぞれ電源端子台１０の第１端子１１、第２端子１２、第３端子１３に接続すると共に、第１コネクタ２０と第３コネクタ４０を、第１端子２１と第１端子４１、第２端子２２と第２端子４２、第３端子２３と第３端子４３が接続されるように、接続する。第１コネクタ２０と第３コネクタ４０には逆に接続されないような構造になっている。これにより、第１コネクタ２０の第１端子２１および第２端子２２は電源端子台１０の第３端子１３に接続される。この結果、リレー６１〜６８がオン状態になると、第１負荷群１は三相電源のＳ相−Ｔ相間に接続され、第２負荷群２は三相電源のＲ相−Ｔ相間に接続される。第３負荷群３は電源端子台１０の第１端子１１と第２端子１２の間、すなわち三相電源のＲ相−Ｓ相間に接続され、第１負荷群１、第２負荷群２、第３負荷群３は互いに同じくらいの大きさであるので、単相負荷は三相電源に均等に分配されるため、不平衡負荷の問題は生じない。
【００４６】
なお、リレー６１〜６８のオン・オフ状態によって、それぞれの負荷群の負荷量に違いが生ずるが、定常状態を含む実際の通常運転においては負荷群の負荷バランスが均一になるようになっているので、不平衡負荷の問題は生じない。
【００４７】
この三相電源接続時に、コネクタの接続方法を間違えて第１コネクタ２０と第２コネクタ３０を接続しても、すべての負荷群に同じ相間の電流が流れる問題は生ずるが、短絡が生じることはない。
【００４８】
実施例の室外機を単相電源に接続するときには、作業者が単相電源を電源端子台１０の第１端子１１と第２端子１２に接続すると共に、第１コネクタ２０と第２コネクタ３０を、第１端子２１と第１端子３１、第２端子２２と第２端子３２、第３端子２３と第３端子３３が接続されるように、接続する。第１コネクタ２０と第２コネクタ３０には逆に接続されないような構造になっている。これにより、第１コネクタ２０の第１端子２１は電源端子台１０の第１端子１１に接続され、第１コネクタ２０の第２端子２２は電源端子台１０の第２端子１２に接続される。この結果、リレー６１〜６８がオン状態になると、第１負荷群１、第２負荷群２、第３負荷群３はいずれも単相電源に接続される。
【００４９】
この単相電源接続時に、コネクタの接続方法を間違えて第１コネクタ２０と第３コネクタ４０を接続しても、第１負荷群１、第２負荷群２に電流が流れないだけで短絡が生ずることはない。このときは第１負荷群１、第２負荷群２が起動しないため作業者は直ちに間違いに気付くことができる。
【００５０】
したがって、三相電源接続時にも、単相電源接続時にも、誤接続時の短絡が発生することがなく、接続することができる。しかもコネクタの接続を切り替えるだけでよいので、タイマーリレーなどを使用する必要がないため低コストである。
【００５１】
次にコネクタの誤接続を検知する方法について説明する。第１端子１１と第２端子１２の間に電圧（電位差）があると、フォトカプラ７１がオン状態になる。その信号を検出することでコントローラ８０は電圧の有無を検出する。一方、同様に、第２端子１２と第３端子１３の間に電圧があるとフォトカプラ７２がオン状態になり、その信号を検出することでコントローラ８０は電圧の有無を検出する。
【００５２】
三相電源に接続されている場合、フォトカプラ７１はＲ相−Ｓ相間に入っておりＲ相−Ｓ相間の電圧の半波毎にフォトカプラ７１がオン状態になる。フォトカプラ７２はＳ相−Ｔ相間に入っており、Ｓ相−Ｔ相間の電圧の半波毎にフォトカプラ７２がオン状態になる。Ｒ相−Ｓ相間、Ｓ相−Ｔ相間、Ｔ−Ｒ相間の電圧には１２０°の位相差があり、フォトカプラ７１とフォトカプラ７２の両方が一定の位相差で電源周波数の半波毎にオン状態になる。
【００５３】
一方、単相電源に接続されている場合、第１端子１１と第２端子１２の間のみに電源電圧が存在するため、フォトカプラ７１のみが電源周波数の半波毎にオン状態になる。したがって、フォトカプラ７１とフォトカプラ７２の出力をコントローラ８０で監視することで供給されている電源が単相か三相かの判別ができる。すなわち、フォトカプラ７１、７２を含む回路が、電源が単相か三相かを検知する第２検知手段となっている。
【００５４】
第１コネクタ２０が第２コネクタ３０か第３コネクタ４０のどちらに接続されているかどうか検知する、すなわち切替手段の切替状態を検知する第１検知手段としてトランジスタ７３を含む回路が用いられている。第１コネクタ２０と第３コネクタ４０が接続されいる場合、第１コネクタ２０の第３端子２３は第３コネクタ４０の第３端子４３が接続され、トランジスタ７３のベースはアースに接続されている。この結果、トランジスタ７３のベースはＧＮＤ電位となり、トランジスタ７３はオフ状態となっている。一方、第１コネクタ２０と第２コネクタ３０が接続されいる場合、第１コネクタ２０の第３端子２３は第２コネクタ３０の第３端子３３が接続され、トランジスタ７３のベースは電源電位（Ｖｄｄ）に接続される。この結果、トランジスタ７３はオン状態となっている。トランジスタ７３がオン状態かオフ状態かコントローラ８０で監視することによってコネクタの接続状態を判別できる。
【００５５】
フォトカプラ７１とフォトカプラ７２により電源が三相であると判別されたとき、トランジスタ７３はオフ状態であれば正しい接続がされていると判断できる。しかし、このときトランジスタ７３はオン状態であれば接続が間違っており、コントローラ８０により表示器７４、７５にエラーコードが表示されるとともに図示しないブザーによって誤接続であることが警報される。
【００５６】
一方、フォトカプラ７１とフォトカプラ７２により電源が三相であると判別されたとき、トランジスタ７３はオン状態であれば正しい接続がされていると判断できる。しかし、このときトランジスタ７３はオフ状態であれば接続が間違っており、コントローラ８０により表示器７４、７５にエラーコードが表示されるとともに図示しないブザーによって誤接続であることが警報される。この結果、エンジン駆動式空気調和装置の設置作業者は設定間違いを認識でき、設定間違いを直ちに修正できる。
【００５７】
なお、実施例においては、第２コネクタ３０の第３端子３３を電源電位に接続し、第３コネクタ４０の第３端子４３をアースに接続しているが、逆に第３端子３３をアースに接続し、第３コネクタ４０の第３端子４３を電源電位に接続してもよい。また、コネクタの接続状態を検知できれば他の検知手段も利用できる。
【００５８】
【発明の効果】
以上のように、本発明は、第１端子、第２端子および第３端子を備えた電源端子台と、前記電源端子台の第１端子に一方が接続された第１負荷群と、前記電源端子台の第２端子に一方が接続された第２負荷群と、前記電源端子台の第１端子と第２端子の間に接続された第３負荷群とが設けられ、単相電源接続時には前記電源端子台の第１端子、第２端子が前記単相電源に接続され、三相電源接続時には前記電源端子台の第１端子、第２端子および第３端子が前記三相電源に接続されるとともに、前記単相電源接続時には前記第１負荷群の他方が前記電源端子台の第２端子に接続されかつ前記第２負荷群の他方が前記電源端子台の第１端子に接続され、前記三相電源接続時には前記第１負荷群の他方および前記第２負荷群の他方が前記第３端子に接続される切替手段が設けられていることを特徴とするエンジン駆動式空気調和装置であるので、低コストで誤接続時の短絡が発生しない、単相電源にも三相電源にも接続できるエンジン駆動式空気調和装置ができる。
【図面の簡単な説明】
【図１】本発明の単相電源接続時について説明する説明図
【図２】本発明の三相電源接続時について説明する説明図
【図３】コネクタを切替手段として使用した場合の説明図
【図４】切替スイッチを切替手段として使用した場合の説明図
【図５】本発明の実施例のエンジン駆動式空気調和装置室外機の回路図
【符号の説明】
１…第１負荷群
２…第２負荷群
３…第３負荷群
１０…電源端子台
１１…電源端子台の第１端子
１２…電源端子台の第２端子
１３…電源端子台の第３端子
２０…第１コネクタ（切替手段）
２１…第１コネクタの第１端子
２２…第１コネクタの第２端子
３０…第２コネクタ（切替手段）
３１…第２コネクタの第１端子
３２…第２コネクタの第２端子
４０…第３コネクタ（切替手段）
４１…第３コネクタの第１端子
４２…第３コネクタの第２端子
５０…切替スイッチ（切替手段）
７１、７２…フォトカプラ（第２検知手段）
７３…トランジスタ（第１検知手段）
７４、７５…表示器（警報手段）
１００…単相電源
２００…三相電源
３００…制御系ユニット[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an engine-driven air conditioner.
[0002]
[Prior art]
2. Description of the Related Art An engine-driven air conditioner is an air conditioner that cools and heats a room by rotating a compressor in a refrigerant circuit by an engine. The engine-driven air conditioner includes an outdoor unit provided with an engine, an outdoor heat exchanger, and the like, and an indoor unit provided with an indoor heat exchanger and the like. In an outdoor unit, a compressor is driven by an engine, but a heat exchanger fan motor, a cooling water pump motor, and the like require a power supply. The power supply is often connected to a three-phase power supply for economic reasons.
[0003]
However, depending on the user, only a single-phase power supply is prepared, and in this case, it is rather expensive to provide a new three-phase power supply. Therefore, there has been a demand for an engine-driven air conditioner that can be connected to a three-phase power supply or a single-phase power supply. The heat exchanger fan motor, cooling water pump motor, etc. have a single-phase specification, and when connecting to a three-phase power supply, it is conceivable to connect to two of the three wires, but it is necessary to avoid an unbalanced load condition .
[0004]
As a prior art, Japanese Patent Application Laid-Open No. 05-317861 discloses that, in an outdoor unit of an engine-driven air conditioner, a single-phase motor is used as a drive motor for a heat exchange fan and a cooling water pump, and a power source is used for both a single-phase motor and a three-phase motor. It is disclosed that in order to enable connection to a single-phase and three-phase, switching between a single phase and three phases is performed by wiring to a terminal block, switching of a switch, or switching of a relay by detecting the presence or absence of a voltage between S and T phases. .
[0005]
[Problems to be solved by the invention]
However, in the prior art methods of switching by wiring to a terminal block or switching the switch, if the switching means is erroneously set to the single-phase side when the three-phase power supply is connected, the power supply will be in a line-to-line short-circuit state, and the short-circuit current will cause the power supply to fail. This will have adverse effects such as breakage including the equipment. Conversely, if the switching means is erroneously set to the three-phase side when a single-phase power supply is connected, power will not be supplied to a single-phase motor other than the single-phase motor connected to the power supply, resulting in malfunction. Further, in this method, there is no detection method when the setting of the switching means is erroneous, and an error is found after actually turning on the power supply and causing a malfunction or adversely affecting the power supply equipment.
[0006]
On the other hand, in the conventional method of detecting the presence or absence of the voltage between the S phase and the T phase and switching by the relay, the switching can be automatically switched and connected without any doubt. When the power is turned on and the voltage between the S phase and the T phase is detected, the phase is switched to the three-phase side. Therefore, there is a problem that the cost is extremely high, for example, a timer relay is required to prevent short circuit between the phases.
[0007]
The present invention has solved the above-mentioned problems, and provides a low-cost engine-driven air conditioner that can be connected to a single-phase power supply or a three-phase power supply without causing a short circuit at the time of incorrect connection.
[0008]
[Means for Solving the Problems]
In order to solve the above technical problem, technical means (hereinafter referred to as first technical means) taken in claim 1 of the present invention includes a first terminal, a second terminal, and a third terminal. A power supply terminal block, a first load group having one connected to a first terminal of the power supply terminal block, a second load group having one connected to a second terminal of the power supply terminal block, A third load group connected between the first terminal and the second terminal of the power supply terminal block. When a single-phase power supply is connected, the first terminal and the second terminal of the power supply terminal block are connected to the single-phase power supply. The first terminal, the second terminal, and the third terminal of the power supply terminal block are connected to the three-phase power supply when the phase power supply is connected, and the other of the first load group is connected to the power supply terminal block when the single-phase power supply is connected. The other of the second load group is connected to a second terminal and is connected to a first terminal of the power terminal block. And a switching means for connecting the other of the first load group and the other of the second load group to a third terminal of the power supply terminal block when the three-phase power supply is connected. It is a type air conditioner.
[0009]
The effects of the first technical means are as follows.
[0010]
That is, when the single-phase power supply is connected, the other of the first load group is connected to the second terminal of the power supply terminal block, and the other of the second load group is connected to the first terminal of the power supply terminal block. Can be connected to a single-phase power supply. At this time, even if the switching unit is erroneously switched to the state when the three-phase power supply is connected, only the first load group and the second load group are connected to the third terminal of the power supply terminal block to which no power supply is connected. There is no short circuit.
[0011]
On the other hand, when the three-phase power supply is connected, the other of the first load group and the other of the second load group are connected to the third terminal of the power terminal block, so that the first load group, the second load group, and the third load group respectively Since it is connected between different phases of the three-phase power supply, the problem of unbalanced load does not arise by balancing the load. At this time, even if the switching means is mistakenly switched to the state when the single-phase power supply is connected, the first load group and the second load group are also connected between the first terminal and the second terminal of the power terminal block. Load groups are connected between the same phases, but no short circuit occurs.
[0012]
Therefore, when the three-phase power supply is connected or the single-phase power supply is connected, the connection can be made without causing a short circuit due to an erroneous connection.
[0013]
In order to solve the above technical problem, the technical means (hereinafter referred to as a second technical means) taken in claim 2 of the present invention is a first technical means which is connected to the other of the first load group. A first connector having a second terminal to which the other of the terminal and the second load group is connected; a first terminal connected to the second terminal of the power terminal block; and a first terminal connected to the first terminal of the power terminal block. A second connector having a second terminal and a third connector having a first terminal and a second terminal connected together to a third terminal of the power terminal block. The first connector and the first connector are connected so that the first terminal of the first connector and the first terminal of the second connector, and the second terminal of the first connector and the second terminal of the second connector are connected when the power is connected. Connect the second connector, and when connecting the three-phase power supply, First connector connected serial first connector and the third connector, an engine driving type air conditioner according to claim 1, characterized in that the second connector and the third connector.
[0014]
The effects of the second technical means are as follows.
[0015]
That is, since the switching between the three-phase mode and the single-phase mode is performed only by switching the connection of the connector, there is no need to use a timer relay or the like, so that the cost is low.
[0016]
In order to solve the above technical problem, the technical means (hereinafter referred to as third technical means) taken in claim 3 of the present invention is a first detecting means for detecting a switching state of the switching means. The engine-driven air according to claim 1 or 2, further comprising a second detection unit for detecting whether a power supply connected to the power supply terminal block is single-phase or three-phase. It is a harmony device.
[0017]
The effects of the third technical means are as follows.
[0018]
That is, the second detection means can detect whether the power supply terminal block is connected to the three-phase power supply or the single-phase power supply, and the first detection means determines whether the switching means is in the switching state in the three-phase connection state or in the single-phase connection state. Since it is possible to detect the switching state at the time, the setting error can be recognized by comparing the detection results of the first detecting means and the second detecting means, and the setting error can be corrected. As a result, it is possible to eliminate such a problem that the power supply equipment is damaged by using only one phase of the three-phase power supply or a load in which the single-phase power supply loses phase occurs.
[0019]
In order to solve the above-mentioned technical problem, the technical means (hereinafter referred to as fourth technical means) taken in claim 4 of the present invention is the switching of the switching means detected by the first detecting means. 4. The engine-driven air conditioner according to claim 3, further comprising an alarm unit that issues an alarm when a state does not correspond to the type of power detected by the second detection unit. .
[0020]
The effects of the fourth technical means are as follows.
[0021]
In other words, the warning means warns the switching setting error of the switching means by comparing the detection results of the first detecting means and the second detecting means, so that the worker can reliably recognize the setting error and immediately correct the setting error.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
The present inventor has considered the reason why a timer relay is required in the related art when a short circuit between phases occurs at the time of erroneous connection or when automatic switching is performed by detecting the presence or absence of a voltage between the S and T phases. The reason is that the three-phase-single-phase switching is performed by short-circuiting the T-phase with the R-phase at the time of the single-phase power supply.
[0023]
The inventor of the present invention has conducted intensive studies to solve the above problems and has led to the present invention. A first terminal, a second terminal, and a third terminal are provided on the power supply terminal block for connection when the supply power is three-phase. When the supply power is single-phase, the first and second terminals of the power supply terminal block are single-phase. The power supply is connected. The load is connected to a first load group connected between the first terminal and the third terminal and a second load connected between the second terminal and the third terminal so that an unbalanced load does not occur when the three-phase power supply is connected. The load group is divided into a load group and a third load group connected between the first terminal and the second terminal. The first load group and the second load group can be disconnected from the third terminal side. When the power supply is single-phase, the third terminal side of the first load group is used as the second terminal, and the second load group is connected to the second terminal. The third terminal side can be connected to the first terminal. As a result, it is possible to connect to a single-phase power supply or a three-phase power supply without generating an unbalanced load when the three-phase power supply is connected, and it is possible to eliminate a short circuit at the time of incorrect connection. Since no timer relay or the like is used, the device can be connected to a single-phase power supply or a three-phase power supply at low cost.
[0024]
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram for explaining a single-phase power supply of the present invention, and FIG. 2 is an explanatory diagram for explaining a three-phase power supply of the present invention.
[0025]
The power supply terminal block 10 is provided with a first terminal 11, a second terminal 12, and a third terminal 13. Loads such as motors are divided into three groups, a first load group 1, a second load group 2, and a third load group 3. When the three-phase power supply is connected, the first load group 1, the second load group 2, and the third load group 3 are connected between different phases, but at this time, the first load group 1, the second load group 1, and the third load group 3 are connected so that an unbalanced load does not occur. The second load group 2 and the third load group 3 are grouped.
[0026]
One of the first load groups 1 is connected to the first terminal 11 of the power supply terminal block 10, and the other is connected to the terminal 21. One of the second load groups 2 is connected to the second terminal 12 of the power terminal block 10, and the other is connected to the terminal 22. One of the third load groups 3 is connected to the first terminal 11 of the power terminal block 10, and the other is connected to the second terminal 12 of the power terminal block 10. That is, the third load group 3 is connected between the first terminal 11 and the second terminal 12 of the power terminal block 10. The terminal 31 is connected to the second terminal 12 of the power terminal block 10, and the terminal 32 is connected to the first terminal 11 of the power terminal block 10. The terminals 41 and 42 are both connected to the third terminal 13 of the power terminal block 10.
[0027]
When a single-phase power supply is connected, a single-phase power supply 100 is connected to the first terminal 11 and the second terminal 12 of the power supply terminal block 10, as shown in FIG. At the same time, the terminals 21 and 31 are connected, and the terminals 22 and 32 are connected. Thus, the other of the first load group 1 is connected to the second terminal 12 of the power supply terminal block 10, and the other of the second load group 2 is connected to the first terminal 11 of the power supply terminal block 10. And the second load group 2 are both connected between the first terminal 11 and the second terminal 12 of the power terminal block 10. As a result, all loads are connected to the single-phase power supply.
[0028]
When a three-phase power supply is connected, a three-phase power supply 200 is connected to all terminals of the power supply terminal block 10 as shown in FIG. For example, the R, S, and T phases of the three-phase power supply 200 are connected to the first terminal 11, the second terminal 12, and the third terminal 13, respectively. At the same time, the terminal 21 and the terminal 41 are connected, and the terminal 22 and the terminal 42 are connected. Thus, the other of the first load group 1 and the other of the second load group 2 are both connected to the third terminal 13 of the power terminal block 10. As a result, the first load group 1, the second load group 2, and the third load group 3 are respectively connected between different phases of the three-phase power supply 200. In FIG. 2, the first load group 1 is connected between the R and T phases, the second load group 2 is connected between the S and T phases, and the third load group 3 is connected between the R and S phases. Therefore, the problem of unbalanced load does not occur.
[0029]
Switching means for connecting the terminal 21 to the terminal 31 or the terminal 41 and connecting the terminal 22 to the terminal 32 or the terminal 42 include a method using a connector shown in FIG. 3 and a method using a changeover switch shown in FIG.
[0030]
FIG. 3 is an explanatory diagram when a connector is used as a switching unit. The terminals 21 and 22 are provided on the first connector 20. The terminals 31 and 32 are provided on the second connector 30. The terminals 41 and 42 are provided on the third connector 40. The connection of these terminals and each load group is the same as in FIG. 1 and FIG.
[0031]
When the single-phase power supply is connected, the first connector 20 and the second connector 30 are connected such that the terminal 21 and the terminal 31 are connected, and the terminal 22 and the terminal 32 are connected. On the other hand, when the three-phase power supply is connected, the first connector 20 and the third connector 40 are connected such that the terminal 21 and the terminal 41 are connected, and the terminal 22 and the terminal 42 are connected. These connectors have a structure in which terminals are not connected in reverse.
[0032]
FIG. 4 is an explanatory diagram when a changeover switch is used as a changeover means. The changeover switch 50 is a switch that switches between connecting the terminal 21 to the terminal 31, the terminal 22 to the terminal 32, and connecting the terminal 21 to the terminal 41 and connecting the terminal 22 to the terminal 42. The connection of these terminals and each load group is the same as in FIG. 1 and FIG. By switching the changeover switch 50, the terminals 21 and 31 are connected and the terminals 22 and 32 are connected when the single-phase power supply is connected. On the other hand, when the three-phase power supply is connected, the terminal 21 and the terminal 41 are connected, and the terminal 22 and the terminal 42 are connected.
[0033]
In the present invention, when the switching means is erroneously switched to the three-phase power supply side when the single-phase power supply is connected, the first load group 1 and the second load group 2 are connected to the third terminal 13 to which no power supply is connected. Since they are only connected, no short circuit will occur just because no current flows. At this time, since the first load group 1 and the second load group 2 are not activated, the operator immediately notices an error. On the other hand, if the switching means is erroneously switched to the single-phase power supply side when the three-phase power supply is connected, the first terminal 21 is connected to the S phase, the second terminal 22 is connected to the T phase, and as a result, There is a problem that current flows between the same R-phase and S-phase in the group, but no short circuit occurs.
[0034]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 5 is a circuit diagram of the engine-driven air conditioner outdoor unit according to the embodiment of the present invention. The same reference numerals are used for members corresponding to the description in FIGS. In FIG. 5, the electrical connection points of the wiring are indicated by black dots in order to prevent complication in the figure. No electrical connection is made at the intersections of the wirings without black dots.
[0035]
The circuit of the outdoor unit according to the embodiment includes a power supply terminal block 10, a first connector 20, a second connector 30, a third connector 40, a heat exchanger fan motor (hereinafter, referred to as a fan motor) 51, 54, 56, and gas. It comprises an electromagnetic valve 52, an electromagnetic valve 53, a cooling water pump motor 55, a starter motor 57, a compressor clutch 58, relays 61 to 68, transformers 76 and 77, a rectifier circuit 79, a control system unit 300, and the like. The control system unit 300 includes a power supply circuit 78, a controller 80, photocouplers 71 and 72, a transistor 73, indicators 74 and 75, and the like. These components are connected by wiring as shown in FIG. The solenoid valve 53 represents a solenoid valve other than the gas solenoid valve 52 such as an oil bypass valve and a refrigerant valve.
[0036]
The power supply terminal block 10 is provided with a first terminal 11, a second terminal 12, and a third terminal 13, and is connected to a 200 V AC single-phase power supply or a 200 V AC three-phase power supply. The single-phase power supply is connected to the first terminal 11 and the second terminal 12. When connecting a three-phase power supply, the first terminal 11 is connected to the R phase, the second terminal 12 is connected to the S phase, and the third terminal 13 is connected to the T phase.
[0037]
The first connector 20 has a first terminal 21, a second terminal 22, and a third terminal 23. The second connector 30 is provided with a first terminal 31, a second terminal 32, and a third terminal 33. The third connector 40 is provided with a first terminal 41, a second terminal 42, and a third terminal 43.
[0038]
The fan motor 51, the gas solenoid valve 52, the solenoid valve 53, and the control system unit 300 are loads constituting the third load group 3. The fan motor 51, the gas solenoid valve 52, and the solenoid valve 53 are connected between the first terminal 11 and the second terminal 12 of the power supply terminal block 10 via relays 61, 62, and 63, respectively. In the control system unit 300, the power supply circuit 78 is a DC 5 V power supply of the control system unit 300. The photocouplers 71 and 72, the transistor 73, and the indicators 74 and 75 are connected to the controller 80. A coil for turning on and off the contacts of the relays 61 to 68 is connected to the controller 80. The power supply circuit 78 of the control system unit 300 is connected to a 200 V AC power supply via a transformer 76. That is, the load of the control system unit 300 is connected to the AC 200V power supply via the transformer 76, and the transformer 76 is directly connected to the AC 200V power supply. The transformer 76 is connected between the first terminal 11 and the second terminal 12 of the power supply terminal block 10.
[0039]
The fan motor 54 and the cooling water pump motor 55 are loads constituting the second load group 2. One of the fan motors 54 is connected to the first terminal 11 of the power supply terminal block 10 via a relay 64, and one of the cooling water pump motors 55 is connected to the first terminal 11 of the power supply terminal block 10 via a relay 65. The other of the fan motor 54 and the cooling water pump motor 55 is connected to the second terminal 22 of the first connector 20.
[0040]
The fan motor 56, the starter motor 57, and the compressor clutch 58 are loads constituting the first load group 1. One of the fan motors 56 is connected to the second terminal 12 of the power supply terminal block 10 via the relay 66, and the other is connected to the first terminal 21 of the first connector 20. The starter motor 57 and the compressor clutch 58 are a DC 12 V system load connected to an AC 200 V power supply via a transformer 77 and a rectifier circuit 79, and the transformer 77 is directly connected to the AC 200 V power supply. One of the transformers 77 is connected to the second terminal 12 of the power supply terminal block 10, and the other is connected to the first terminal 21 of the first connector 20. The starter motor 57 and the compressor clutch 58 are connected to a rectifier circuit 79 via relays 67 and 68, respectively.
[0041]
The loads of the first load group 1, the second load group 2, and the third load group 3 are all single-phase loads. The first load group 1, the second load group 2, and the third load group 3 are selected such that the sum of the loads is approximately the same as each other.
[0042]
The third terminal 23 of the first connector 20 is connected to the base of the transistor 73 via a resistor. The collector of the transistor 73 is connected to the power supply potential (Vdd) of the power supply circuit 78 via the controller 80 and the resistor. The emitter of the transistor 73 is grounded.
[0043]
The first terminal 31 of the second connector 30 is connected to the first terminal 11 of the power terminal block 10. The second terminal 32 of the second connector 30 is connected to the second terminal 12 of the power terminal block 10. The third terminal 33 of the second connector 30 is connected to the power supply potential (Vdd) of the power supply circuit 78.
[0044]
The first terminal 41 and the second terminal 42 of the third connector 40 are both connected to the third terminal 13 of the power terminal block 10. The third terminal 43 of the third connector 40 is grounded.
[0045]
Each of the photocouplers 71 and 72 is a photocoupler including a light emitting diode and a light receiving transistor. The light emitting diode of the photocoupler 71 is connected between the first terminal 11 and the second terminal 12 of the power terminal block 10. The light emitting diode of the photocoupler 72 is connected between the second terminal 12 and the third terminal 13 of the power terminal block 10. The collectors of the light receiving transistors of the photocouplers 71 and 72 are both connected to the power supply potential (Vdd) of the power supply circuit 78 via the controller 80 and the resistor. The emitters of the light receiving transistors of the photocouplers 71 and 72 are both grounded.
When the outdoor unit of the embodiment is connected to the three-phase power supply, the operator can connect the R, S, and T phases of the three-phase power supply to the first terminal 11, the second terminal 12, and the third terminal of the power terminal block 10, respectively. 13, the first connector 20 and the third connector 40 are connected, the first terminal 21 and the first terminal 41, the second terminal 22 and the second terminal 42, and the third terminal 23 and the third terminal 43 are connected. And so on. The structure is such that the first connector 20 and the third connector 40 are not connected in reverse. Thus, the first terminal 21 and the second terminal 22 of the first connector 20 are connected to the third terminal 13 of the power terminal block 10. As a result, when the relays 61 to 68 are turned on, the first load group 1 is connected between the S and T phases of the three-phase power supply, and the second load group 2 is connected between the R and T phases of the three-phase power supply. You. The third load group 3 is connected between the first terminal 11 and the second terminal 12 of the power supply terminal block 10, that is, between the R phase and the S phase of the three-phase power supply, and the first load group 1, the second load group 2, Since the three load groups 3 are approximately the same size, the single-phase load is evenly distributed to the three-phase power supply, so that the problem of unbalanced load does not occur.
[0046]
Although the load amounts of the respective load groups differ depending on the on / off states of the relays 61 to 68, the load groups of the load groups become uniform in the actual normal operation including the steady state. Therefore, the problem of unbalanced load does not occur.
[0047]
If the first connector 20 and the second connector 30 are connected with the wrong connector connection method at the time of connecting the three-phase power supply, a problem occurs in that the current between the same phases flows through all the load groups, but a short circuit does not occur. Absent.
[0048]
When connecting the outdoor unit of the embodiment to a single-phase power supply, an operator connects the single-phase power supply to the first terminal 11 and the second terminal 12 of the power supply terminal block 10 and connects the first connector 20 and the second connector 30 to each other. The first terminal 21 is connected to the first terminal 31, the second terminal 22 is connected to the second terminal 32, and the third terminal 23 is connected to the third terminal 33. The first connector 20 and the second connector 30 are structured so as not to be connected in reverse. Thereby, the first terminal 21 of the first connector 20 is connected to the first terminal 11 of the power terminal block 10, and the second terminal 22 of the first connector 20 is connected to the second terminal 12 of the power terminal block 10. As a result, when the relays 61 to 68 are turned on, the first load group 1, the second load group 2, and the third load group 3 are all connected to a single-phase power supply.
[0049]
Even when the first connector 20 and the third connector 40 are connected by mistake in the connection method of the connectors at the time of connecting the single-phase power supply, a short circuit occurs because only the current does not flow through the first load group 1 and the second load group 2. Never. At this time, since the first load group 1 and the second load group 2 are not activated, the operator can immediately notice the mistake.
[0050]
Therefore, when the three-phase power supply is connected or the single-phase power supply is connected, the connection can be made without causing a short circuit due to an erroneous connection. Moreover, since it is only necessary to switch the connection of the connector, there is no need to use a timer relay or the like, so that the cost is low.
[0051]
Next, a method of detecting an erroneous connection of a connector will be described. When there is a voltage (potential difference) between the first terminal 11 and the second terminal 12, the photocoupler 71 is turned on. By detecting the signal, the controller 80 detects the presence or absence of a voltage. On the other hand, similarly, when there is a voltage between the second terminal 12 and the third terminal 13, the photocoupler 72 is turned on, and the controller 80 detects the presence or absence of the voltage by detecting the signal.
[0052]
When the photocoupler 71 is connected to a three-phase power supply, the photocoupler 71 is between the R phase and the S phase, and the photocoupler 71 is turned on for each half-wave of the voltage between the R phase and the S phase. The photocoupler 72 is between the S phase and the T phase, and the photocoupler 72 is turned on every half-wave of the voltage between the S phase and the T phase. The voltage between the R-phase and the S-phase, the voltage between the S-phase and the T-phase, and the voltage between the T-R phases have a phase difference of 120 °, and both the photocoupler 71 and the photocoupler 72 have a constant phase difference every half-wave of the power supply frequency It turns on.
[0053]
On the other hand, when connected to a single-phase power supply, since the power supply voltage exists only between the first terminal 11 and the second terminal 12, only the photocoupler 71 is turned on every half-wave of the power supply frequency. Therefore, by monitoring the output of the photocoupler 71 and the photocoupler 72 with the controller 80, it is possible to determine whether the supplied power is single-phase or three-phase. That is, the circuit including the photocouplers 71 and 72 is a second detection unit that detects whether the power supply is single-phase or three-phase.
[0054]
A circuit including a transistor 73 is used as first detection means for detecting whether the first connector 20 is connected to the second connector 30 or the third connector 40, that is, for detecting the switching state of the switching means. When the first connector 20 and the third connector 40 are connected, the third terminal 23 of the first connector 20 is connected to the third terminal 43 of the third connector 40, and the base of the transistor 73 is connected to the ground. As a result, the base of the transistor 73 has the GND potential, and the transistor 73 is off. On the other hand, when the first connector 20 and the second connector 30 are connected, the third terminal 23 of the first connector 20 is connected to the third terminal 33 of the second connector 30, and the base of the transistor 73 is connected to the power supply potential (Vdd). Connected to. As a result, the transistor 73 is turned on. By monitoring whether the transistor 73 is on or off by the controller 80, the connection state of the connector can be determined.
[0055]
When the photocoupler 71 and the photocoupler 72 determine that the power supply has three phases, if the transistor 73 is off, it can be determined that the connection is correct. However, at this time, if the transistor 73 is in the ON state, the connection is incorrect, and the controller 80 displays an error code on the displays 74 and 75 and warns of the incorrect connection by a buzzer (not shown).
[0056]
On the other hand, when the photocoupler 71 and the photocoupler 72 determine that the power is three-phase, if the transistor 73 is on, it can be determined that the connection is correct. However, at this time, if the transistor 73 is off, the connection is incorrect, and the controller 80 displays an error code on the displays 74 and 75 and warns of the incorrect connection by a buzzer (not shown). As a result, the operator of the engine-driven air conditioner can recognize the setting error and can correct the setting error immediately.
[0057]
In the embodiment, the third terminal 33 of the second connector 30 is connected to the power supply potential, and the third terminal 43 of the third connector 40 is connected to the ground. Conversely, the third terminal 33 is connected to the ground. And the third terminal 43 of the third connector 40 may be connected to the power supply potential. In addition, other detection means can be used as long as the connection state of the connector can be detected.
[0058]
【The invention's effect】
As described above, the present invention provides a power supply terminal block having a first terminal, a second terminal, and a third terminal, a first load group having one connected to the first terminal of the power supply terminal block, A second load group, one of which is connected to the second terminal of the terminal block, and a third load group, which is connected between the first terminal and the second terminal of the power supply terminal block, are provided. A first terminal and a second terminal of the power supply terminal block are connected to the single-phase power supply. When a three-phase power supply is connected, a first terminal, a second terminal, and a third terminal of the power supply terminal block are connected to the three-phase power supply. And when the single-phase power supply is connected, the other of the first load group is connected to a second terminal of the power terminal block, and the other of the second load group is connected to a first terminal of the power terminal block. When a three-phase power supply is connected, the other of the first load group and the other of the second load group are connected to the third terminal. An engine-driven air conditioner characterized by being provided with a switching means to be connected, so that the engine can be connected to a single-phase power supply or a three-phase power supply at a low cost without causing a short circuit at the time of incorrect connection. A driven air conditioner can be created.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating a case where a single-phase power supply is connected according to the present invention.
FIG. 2 is an explanatory diagram illustrating a state when a three-phase power supply is connected according to the present invention.
FIG. 3 is an explanatory diagram when a connector is used as a switching unit;
FIG. 4 is an explanatory diagram when a changeover switch is used as a changeover means;
FIG. 5 is a circuit diagram of an engine-driven air conditioner outdoor unit according to an embodiment of the present invention.
[Explanation of symbols]
1: First load group
2: Second load group
3: Third load group
10 Power supply terminal block
11 1st terminal of power supply terminal block
12: second terminal of power terminal block
13: Third terminal of power terminal block
20: first connector (switching means)
21: first terminal of the first connector
22... Second terminal of the first connector
30 second connector (switching means)
31... First terminal of the second connector
32: second terminal of the second connector
40 ... third connector (switching means)
41: first terminal of the third connector
42... Second terminal of the third connector
50: changeover switch (switching means)
71, 72... Photocoupler (second detecting means)
73 ... transistor (first detecting means)
74, 75 ... display (alarm means)
100 ... single phase power supply
200 ... three-phase power supply
300 Control unit

Claims

A power terminal block having a first terminal, a second terminal, and a third terminal;
A first load group having one connected to a first terminal of the power terminal block;
A second load group having one connected to a second terminal of the power terminal block;
A third load group connected between a first terminal and a second terminal of the power terminal block;
When a single-phase power supply is connected, the first and second terminals of the power supply terminal block are connected to the single-phase power supply. When a three-phase power supply is connected, the first, second, and third terminals of the power supply terminal block are connected to the three-phase power supply. Phase power supply
When the single-phase power supply is connected, the other of the first load group is connected to a second terminal of the power supply terminal block, and the other of the second load group is connected to a first terminal of the power supply terminal block. Switching means for connecting the other of the first load group and the other of the second load group to a third terminal of the power supply terminal block at the time of connection is provided.

A first connector having a first terminal to which the other of the first load group is connected and a second terminal to which the other of the second load group is connected;
A second connector having a first terminal connected to the second terminal of the power supply terminal block and a second terminal connected to the first terminal of the power supply terminal block;
A third connector having a first terminal and a second terminal connected together to a third terminal of the power terminal block;
The switching means connects the first terminal of the first connector, the first terminal of the second connector, the second terminal of the first connector, and the second terminal of the second connector when the single-phase power supply is connected. The first connector and the second connector are connected as described above, and the first connector, the second connector, and the third connector are connected when the three-phase power supply is connected. The engine-driven air conditioner according to claim 1, wherein

A first detecting means for detecting a switching state of the switching means, and a second detecting means for detecting whether a power supply connected to the power terminal block is single-phase or three-phase is provided. The engine-driven air conditioner according to claim 1 or 2.

An alarm unit for issuing an alarm when the switching state of the switching unit detected by the first detecting unit does not correspond to the type of power detected by the second detecting unit is provided. The engine-driven air conditioner according to claim 3.