JP4097405B2

JP4097405B2 - Engine cooling method and apparatus and refrigeration apparatus

Info

Publication number: JP4097405B2
Application number: JP2001021737A
Authority: JP
Inventors: 啓赤塚; 弘毅濱田
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 2001-01-30
Filing date: 2001-01-30
Publication date: 2008-06-11
Anticipated expiration: 2021-01-30
Also published as: JP2002228294A

Description

【０００１】
【発明の属する技術分野】
本発明は、エンジンを冷却すると共に、そのエンジン排熱を利用するエンジン冷却方法及び装置、並びに圧縮機がエンジンにより駆動されると共に、上記エンジン冷却装置を備えた冷凍装置に関する。
【０００２】
【従来の技術】
冷凍装置としての空気調和装置１００には、図２に示すように、圧縮機１０１がガスエンジン１０２により駆動されるガスヒートポンプ式空気調和装置が知られている。このような空気調和装置１００では、室外機１０３が、上記圧縮機１０１、四方弁１０５、室外熱交換器１０６及び室外膨張弁１０７を備え、室内機１０４が室内熱交換器１０８及び室内膨張弁１０９を備えて構成される。
【０００３】
四方弁１０５の切り換えにより、冷房運転時に室外熱交換器１０６が凝縮器となり、室内熱交換器１０８が蒸発器となって、冷媒の蒸発熱により室内熱交換器１０８が室内を冷房する。また、四方弁１０５の切り換えによる暖房運転時には、室外熱交換器１０６が蒸発器となり、室内熱交換器１０８が凝縮器となって、冷媒の凝縮熱により室内熱交換器１０８が室内を暖房する。
【０００４】
冷媒を圧縮する圧縮機１０１を駆動するガスエンジン１０２は、エンジン冷却装置１１０によって冷却される。このエンジン冷却装置１１０は、一端部がガスエンジン１０２に付設された排ガス熱交換器（不図示）にガスエンジン１０２を介して接続されるとともに、他端部がその排ガス熱交換器に直接接続された略閉ループ形状の冷却水配管１１１に温水熱交換器１１４、ワックス三方弁１１２、ラジエータ１１５及び循環ポンプ１１６が配設され、ワックス三方弁１１２とラジエータ１１５とが並列配置されて構成される。
【０００５】
ガスエンジン１０２の排熱を回収したエンジン冷却水は、循環ポンプ１１６の稼働により冷却水配管１１１内を循環し、この間に温水熱交換器１１４及びラジエータ１１５にて冷却（放熱）され、または温水熱交換器１１４のみにて冷却（放熱）され、これによりガスエンジン１０２を冷却する。
【０００６】
上記温水熱交換器１１４は、空気調和装置１００の冷房運転時に、温水供給系１１７を流れる温水と上記エンジン冷却水とを熱交換するものであり、この加熱された温水が有効利用される。
【０００７】
従来、温水熱交換器１１４にて加熱されて取り出される温水の温度は、約４５℃が標準である。このときのワックス三方弁１１２の設定温度は約６０〜７０℃である。
【０００８】
従って、温水熱交換器１１４から流出したエンジン冷却水は、その温度が６０℃未満のときには、ワックス三方弁１１２によってすべて循環ポンプ１１６の吸込側へ導かれる。温水熱交換器１１４から流出したエンジン冷却水の温度が７０℃以上の時には、このエンジン冷却水は全てラジエータ１１５側へ導かれ、このラジエータ１１５にて冷却（放熱）されたエンジン冷却水が、ワックス三方弁１１２を経て循環ポンプ１１６の吸込側へ戻される。また、温水熱交換器１１４から流出したエンジン冷却水は、その温度が６０℃以上７０℃未満の時には、ワックス三方弁１１２によって循環ポンプ１１６の吸込側とラジエータ１１５側との双方へ導かれる。
【０００９】
【発明が解決しようとする課題】
上述のようなエンジン冷却装置１１０において、温水熱交換器１１４にて加熱されて取り出される温水の温度を約７０℃としたときには、ワックス三方弁１１２の設定温度が約６５〜７５℃以上となる。従って、温水熱交換器１１４から流出するエンジン冷却水は、その温度が約６５℃以上となるまでは、ラジエータ１１５へ導かれて冷却（放熱）されることがなく、ガスエンジン１０２へ戻される。
【００１０】
このため、エンジン冷却水は、ガスエンジン１０２内で約９０℃以上の温度となることがあり、局部的に沸騰して、気泡の滞留により流れが阻害されることがある。このような場合には、ガスエンジン１０２の冷却が不充分となったり、エンジンオイルが劣化する等の不具合が発生する恐れがある。
【００１１】
本発明の目的は、上述の事情を考慮してなされたものであり、第１媒体（例えばエンジン冷却水）によりエンジンを好適に冷却できるとともに、熱交換器の熱交換効率を向上させて高温の第２媒体（例えば温水）を取り出すことができるエンジン冷却方法及び装置並びに冷凍装置を提供することにある。
【００１２】
【課題を解決するための手段】
請求項１に記載の発明は、エンジンの排熱を回収する第１媒体が熱交換器、ラジエータにて冷却されて循環し、上記エンジンを冷却するとともに、上記熱交換器により上記第１媒体が第２媒体と熱交換するエンジン冷却方法において、上記熱交換器の下流側に配置され、入口が熱交換器側に接続されるとともに一方の出口が上記ラジエータ側に他方の出口が上記エンジン側に接続された三方弁を、上記エンジンを冷却した直後の上記第１媒体の温度と、上記熱交換器により熱交換された直後の上記第１媒体の温度と、上記第２媒体の熱交換後の設定温度に基づき設定される上記第１媒体の設定値とに基づき制御して、この三方弁から上記ラジエータと上記エンジンへ導く第１媒体を調整し、上記ラジエータと上記エンジンへ導く第１媒体の流量を分配することを特徴とするものである。
【００１３】
請求項２に記載の発明は、請求項１に記載の発明において、上記三方弁は切替式三方弁であり、上記エンジンを冷却した直後の第１媒体の温度と、上記熱交換器により熱交換された直後の上記第１媒体の温度と、上記第２媒体の熱交換後の設定温度に基づき設定される上記第１媒体の設定値とに基づき、上記熱交換器から流出した第１媒体をラジエータとエンジンとへ択一に導くよう構成されるとともに、上記熱交換器から流出した上記第１媒体の一部を上記三方弁を介さずに上記ラジエータへ導くバイパス管により上記熱交換器の出口側と上記ラジエータの入口側とが連結されることを特徴とするものである。
請求項３に記載の発明は、請求項２に記載の発明において、上記第１媒体が上記ラジエータに導かれるように当該三方弁が一旦切り替えられたときは、遅延タイマの設定時間に相当する時間を経過した後でなければ、上記第１媒体が上記エンジンへ導かれるように上記三方弁が切り替えられないことを特徴とするものである。
請求項４に記載の発明は、請求項１〜３のいずれかに記載の発明において、上記第１媒体がエンジン冷却水であり、上記第２媒体が温水であることを特徴とするものである。
【００１４】
請求項５に記載の発明は、エンジンの排熱を回収する第１媒体が熱交換器、ラジエータにて冷却されて循環し、上記エンジンを冷却するとともに、上記熱交換器が上記第１媒体と第２媒体とを熱交換するよう構成されたエンジン冷却装置において、上記熱交換器の下流側に配置され、入口が熱交換器側に接続されるとともに一方の出口が上記ラジエータ側に他方の出口が上記エンジン側に接続された三方弁は、上記エンジンを冷却した直後の上記第１媒体の温度と、上記熱交換器により熱交換された直後の上記第１媒体の温度と、上記第２媒体の熱交換後の設定温度に基づき設定される上記第１媒体の設定値とに基づき、上記ラジエータと上記エンジンへ導く上記第１媒体を調整し、上記ラジエータと上記エンジンへ導く第１媒体の流量を分配するよう構成されたことを特徴とするものである。
【００１５】
請求項６に記載の発明は、請求項５に記載の発明において、上記三方弁は切替式三方弁であり、エンジンを冷却した直後の第１媒体の温度と、熱交換器により熱交換された直後の上記第１媒体の温度と、上記第２媒体の熱交換後の設定温度に基づき設定される上記第１媒体の設定値とに基づき、上記熱交換器から流出した第１媒体をラジエータとエンジンとへ択一に導くよう構成されるとともに、上記熱交換器から流出した上記第１媒体の一部を上記三方弁を介さずに上記ラジエータへ導くバイパス管により上記熱交換器の出口側と上記ラジエータの入口側とが連結されることを特徴とするものである。
請求項７に記載の発明は、請求項６に記載の発明において、上記第１媒体が上記ラジエータに導かれるように当該三方弁が一旦切り替えられたときは、遅延タイマの設定時間に相当する時間を経過した後でなければ、上記第１媒体が上記エンジンへ導かれるように上記三方弁が切り替えられないことを特徴とするものである。
【００１６】
請求項８に記載の発明は、請求項５に記載の発明において、上記三方弁は比例式三方弁であり、エンジンを冷却した直後の第１媒体の温度と、熱交換器により熱交換された直後の上記第１媒体の温度と、上記第２媒体の熱交換後の設定温度に基づき設定される上記第１媒体の設定値とに基づき、上記熱交換器から流出した第１媒体の流量をラジエータとエンジンへ分配して導くよう構成されたことを特徴とするものである。
【００１７】
請求項９に記載の発明は、請求項５〜８のいずれかに記載の発明において、上記第１媒体がエンジン冷却水であり、上記第２媒体が温水であることを特徴とするものである。
【００１８】
請求項１０に記載の発明は、順次接続された圧縮機、凝縮器、膨張機構、蒸発器を冷媒が循環し、上記圧縮機がエンジンにより駆動されるとともにエンジン冷却装置を有し、このエンジン冷却装置は、上記エンジンの排熱を回収する第１媒体が熱交換器、ラジエータにて冷却されて循環し、上記エンジンを冷却するとともに、上記熱交換器が上記第１媒体と第２媒体とを熱交換するよう構成されたものである冷凍装置において、上記エンジン冷却装置における上記熱交換器の下流側に配置され、入口が熱交換器側に接続されるとともに一方の出口が上記ラジエータ側に他方の出口が上記エンジン側に接続された三方弁は、上記エンジンを冷却した直後の上記第１媒体の温度と、上記熱交換器により熱交換された直後の上記第１媒体の温度と、上記第２媒体の熱交換後の設定温度に基づき設定される上記第１媒体の設定値とに基づき、上記ラジエータと上記エンジンへ導く上記第１媒体を調整し、上記ラジエータと上記エンジンへ導く第１媒体の流量を分配するよう構成されたことを特徴とするものである。
【００１９】
請求項１１に記載の発明は、請求項１０に記載の発明において、上記エンジン冷却装置における三方弁は切替式三方弁であり、エンジンを冷却した直後の第１媒体の温度と、熱交換器により熱交換された直後の上記第１媒体の温度と、上記第２媒体の熱交換後の設定温度に基づき設定される上記第１媒体の設定値とに基づき、上記熱交換器から流出した第１媒体をラジエータとエンジンとへ択一に導くよう構成されるとともに、上記熱交換器から流出した上記第１媒体の一部を上記三方弁を介さずに上記ラジエータへ導くバイパス管により上記熱交換器の出口側と上記ラジエータの入口側とが連結されることを特徴とするものである。
請求項１２に記載の発明は、請求項１１に記載の発明において、上記第１媒体が上記ラジエータに導かれるように当該三方弁が一旦切り替えられたときは、遅延タイマの設定時間に相当する時間を経過した後でなければ、上記第１媒体が上記エンジンへ導かれるように上記三方弁が切り替えられないことを特徴とするものである。
【００２０】
請求項１３に記載の発明は、請求項１０に記載の発明において、上記エンジン冷却装置における三方弁は比例式三方弁であり、エンジンを冷却した直後の第１媒体の温度と、熱交換器により熱交換された直後の上記第１媒体の温度と、上記第２媒体の熱交換後の設定温度に基づき設定される上記第１媒体の設定値とに基づき、上記熱交換器から流出した第１媒体の流量をラジエータとエンジンへ分配して導くよう構成されたことを特徴とするものである。
【００２１】
請求項１４に記載の発明は、請求項１０〜１３のいずれかに記載の発明において、上記エンジン冷却装置における第１媒体がエンジン冷却水であり、第２媒体が温水であることを特徴とするものである。
【００２２】
請求項１〜１４に記載の発明には、次の作用がある。
【００２３】
エンジン冷却装置における熱交換器の下流側に配置された三方弁が、ラジエータとエンジンへ導く第１媒体の調整を、エンジンを冷却した直後の第１媒体の温度と、熱交換器により熱交換された直後の第１媒体の温度と、上記第２媒体の熱交換後の設定温度に基づき設定される上記第１媒体の設定値とに基づいて実行することから、上記熱交換器にて熱交換されて冷却された第１媒体をラジエータで必要以上に冷却することを防止できるので、熱交換器の熱交換効率を向上させて高温の第２媒体を取り出すことができるとともに、エンジンの冷却に支障が生じないように第１媒体の温度を維持できるので、第１媒体によるエンジンの冷却を好適に実施できる。
【００２４】
【発明の実施の形態】
［Ａ］第１実施の形態
以下、本発明の実施の形態を、図面に基づき説明する。
【００２５】
図１は、本発明に係る冷凍装置の一実施の形態が適用された空気調和装置の冷媒回路を示す回路図である。
【００２６】
この図１に示すように、冷凍装置としてのヒートポンプ式空気調和装置１０は、室外機１１、複数台（例えば２台）の室内機１２Ａ、１２Ｂ及び制御装置１３を有してなり、室外機１１の室外冷媒配管１４と室内機１２Ａ、１２Ｂの各室内冷媒配管１５Ａ、１５Ｂとが連結されている。
【００２７】
室外機１１は室外に設置され、室外冷媒配管１４には圧縮機１６が配設されるとともに、この圧縮機１６の吸込側にアキュムレータ１７が、吐出側に四方弁１８がそれぞれ配設され、この四方弁１８側に室外熱交換器１９、室外膨張弁２４、ドライコア２５が順次配設されて構成される。室外熱交換器１９には、この室外熱交換器１９へ向かって送風する室外ファン２０が隣接して配置されている。また、圧縮機１６は、フレキシブルカップリング２７等を介してガスエンジン３０に連結され、このガスエンジン３０により駆動される。更に、室外膨張弁２４をバイパスして冷媒系バイパス管２６が配設されている。
【００２８】
一方、室内機１２Ａ、１２Ｂはそれぞれ室内に設置され、それぞれ、室内冷媒配管１５Ａ、１５Ｂに室内熱交換器２１Ａ、２１Ｂが配設されるとともに、室内冷媒配管１５Ａ、１５Ｂのそれぞれにおいて室内熱交換器２１Ａ、２１Ｂの近傍に室内膨張弁２２Ａ、２２Ｂが配設されて構成される。上記室内熱交換器２１Ａ、２１Ｂには、これらの室内熱交換器２１Ａ、２１Ｂへ送風する室内ファン２３Ａ、２３Ｂが隣接して配置されている。
【００２９】
尚、図１中の符号２８はストレーナを示す。また、符号２９は、圧縮機１６の吐出側の冷媒圧力を圧縮機１６の吸込側へ逃す安全弁である。
【００３０】
また、上記制御装置１３は、室外機１１及び室内機１２Ａ、１２Ｂの運転を制御し、具体的には、室外機１１におけるガスエンジン３０（即ち圧縮機１６）、四方弁１８、室外ファン２０及び室外膨張弁２４、並びに室内機１２Ａ、１２Ｂにおける室内膨張弁２２Ａ、２２Ｂ、及び室内ファン２３Ａ、２３Ｂをそれぞれ制御する。更に、制御装置１３は、後述するエンジン冷却装置４１の循環ポンプ４７、温水三方弁４５及び外部ポンプ５０等を制御する。
【００３１】
制御装置１３により四方弁１８が切り換えられることにより、ヒートポンプ式空気調和装置１０が冷房運転又は暖房運転に設定される。つまり、制御装置１３が四方弁１８を冷房側に切り換えたときには、冷媒が実線矢印の如く流れ、室外熱交換器１９が凝縮器に、室内熱交換器２１Ａ、２１Ｂが蒸発器になって冷房運転状態となり、各室内熱交換器２１Ａ、２１Ｂが室内を冷房する。また、制御装置１３が四方弁１８を暖房側に切り換えたときには、冷媒が破線矢印の如く流れ、室内熱交換器２１Ａ、２１Ｂが凝縮器に、室外熱交換器１９が蒸発器になって暖房運転状態となり、各室内熱交換器２１Ａ、２１Ｂが室内を暖房する。
【００３２】
また、制御装置１３は、冷房運転時には、室内膨張弁２２Ａ、２２Ｂのそれぞれの弁開度を空調負荷に応じて制御する。この冷房運転時に、冷媒は、室外膨張弁２４をバイパスして冷媒系バイパス管２６を流れる。暖房運転時には、制御装置１３は、室外膨張弁２４及び室内膨張弁２２Ａ、２２Ｂのそれぞれの弁開度を空調負荷に応じて制御する。
【００３３】
一方、圧縮機１６を駆動するガスエンジン３０の燃焼室（不図示）には、エンジン燃料供給装置３１から混合気が供給される。このエンジン燃料供給装置３１は、燃料供給配管３２に、２個の燃料遮断弁３３、ゼロガバナ３４、燃料調整弁３５及びアクチュエータ３６が順次配設され、この燃料供給配管３２のアクチュエータ３６側端部がガスエンジン３０の上記燃焼室に接続されて構成される。
【００３４】
燃料遮断弁３３は、直列に２個配設されて２閉鎖型の燃料遮断弁機構を構成し、２個の燃料遮断弁３３が連動して全閉または全開し、燃料ガスの漏れのない遮断と連通とを択一に実施する。
【００３５】
ゼロガバナ３４は、燃料供給配管３２内における当該ゼロガバナ３４の前後の１次側燃料ガス圧力（一次圧ａ）と２次側燃料ガス圧力（二次圧ｂ）とのうち、一次圧ａの変動によっても二次圧ｂを一定の所定圧に調整して、ガスエンジン３０の運転を安定化させる。
【００３６】
燃料調整弁３５は、アクチュエータ３６の上流側から空気が導入されることで生成される混合気の空燃比を最適に調整するものである。また、アクチュエータ３６は、ガスエンジン３０の燃焼室へ供給される混合気の供給量を調整して、ガスエンジン３０の回転数を制御する。
【００３７】
ガスエンジン３０には、エンジンオイル供給装置３７が接続されている。このエンジンオイル供給装置３７は、オイル供給配管３８にオイル遮断弁３９及びオイル供給ポンプ４０等が配設されたものであり、ガスエンジン３０へエンジンオイルを適宜供給する。
【００３８】
前記制御装置１３によるガスエンジン３０の制御は、具体的には、エンジン燃料供給装置３１の燃料遮断弁３３、ゼロガバナ３４、燃料調整弁３５及びアクチュエータ３６、並びにエンジンオイル供給装置３７のオイル遮断弁３９及びオイル供給ポンプ４０を制御装置１３が制御することによってなされる。
【００３９】
さて、上記ガスエンジン３０は、エンジン冷却装置４１内を循環する第１媒体としてのエンジン冷却水により冷却される。このエンジン冷却装置４１は、一端部がガスエンジン３０に付設の図示しない排ガス熱交換器にガスエンジン３０を介して接続されるとともに、他端部がその排ガス熱交換器に直接接続された略閉ループ形状の冷却水配管４２にワックス三方弁４３、熱交換器としての温水熱交換器４４、温水三方弁４５、ラジエータ４６及び循環ポンプ４７が順次配設され、冷却系バイパス管４８及び温水供給系４９を有して構成される。
【００４０】
上記循環ポンプ４７は、稼働時にエンジン冷却水を昇圧して、このエンジン冷却水を冷却水配管４２内で循環させる。
【００４１】
上記ワックス三方弁４３は、ガスエンジン３０を速やかに暖機させるためのものである。このワックス三方弁４３は、入口４３Ａが、冷却水配管４２におけるガスエンジン３０に付設の排ガス熱交換器側に、低温側出口４３Ｂが冷却水配管４２における循環ポンプ４７の吸込側に、高温側出口４３Ｃが冷却水配管４２における温水熱交換器４４側にそれぞれ接続される。
【００４２】
エンジン冷却水は、循環ポンプ４７の吐出側から約４０℃でガスエンジン３０に付設された排ガス熱交換器へ流入し、ガスエンジン３０の排熱（排気ガスの熱）を回収した後に、ガスエンジン３０に流れてこのガスエンジン３０を冷却し、約８０℃に加熱される。ガスエンジン３０からワックス三方弁４３に流入したエンジン冷却水は、低温（例えば８０℃以下）のときには低温側出口４３Ｂから循環ポンプ４７に戻されてガスエンジン３０を速やかに暖機し、高温（例えば８０℃以上）のときには高温側出口４３Ｃから温水熱交換器４４へ流れる。
【００４３】
この温水熱交換器４４は、外部ポンプ５０を備えた温水供給系４９の外部配管５１内を流れる第２媒体としての温水と、ワックス三方弁４３から流入したエンジン冷却水とを熱交換して、この温水供給系４９の温水をガスエンジン３０の排熱により加熱して昇温させるものである。
【００４４】
温水供給系４９の温水は、例えば約６０℃で温水熱交換器４４内に流入し、この温水熱交換器４４により約７０℃に昇温されて外部の利用部へ供給される。このように昇温された温水供給系４９の温水は、給湯用や、デシカント空気調和装置の除湿剤の乾燥用に利用される。ここで、デシカント空気調和装置は、除湿剤を用いて、室温を低下させることなく除湿を実施可能とする空気調和装置である。
【００４５】
温水熱交換器４４により温水供給系４９の温水と熱交換されたエンジン冷却水は、約６５℃まで温度低下（冷却）して温水三方弁４５へ流される。
【００４６】
この温水三方弁４５は、入口４５Ａが冷却水配管４２における温水熱交換器４４側に接続されて、この温水熱交換器４４の下流側に配置されたものである。また、温水三方弁４５のＯＮ側出口４５Ｂは、冷却水配管４２における循環ポンプ４７の吸込側に接続され、また、温水三方弁４５のＯＦＦ側出口４５Ｃは、冷却水配管４２におけるラジエータ４６側に接続される。
【００４７】
この温水三方弁４５は、本実施の形態では、温水熱交換器４４から入口４５Ａを経て流入したエンジン冷却水を、ＯＮ側出口４５Ｂを経て循環ポンプ４７の吸込側へ、またはＯＦＦ側出口４５Ｃを経てラジエータ４６へ択一に導く切替式の三方弁である。温水三方弁４５は、モータ（不図示）により駆動され、このモータを制御装置１３が制御する。
【００４８】
ここで、冷却水配管４２には、温水熱交換器４４と温水三方弁４５の入口４５Ａとの間に温水熱交換器出口温度センサ５２が設置される。この温水熱交換器出口温度センサ５２により、温水熱交換器４４にて熱交換された直後のエンジン冷却水の温度が検出され、この検出温度は制御装置１３へ送信される。更に、冷却水配管４２には、ガスエンジン３０とワックス三方弁４３との間にエンジン出口温度センサ５３が設置される。このエンジン出口温度センサ５３により、ガスエンジン３０を冷却した直後のエンジン冷却水の温度が検出され、この検出温度が制御装置１３へ送信される。
【００４９】
上記温水三方弁４５は、エンジン出口温度センサ５３による検出温度が約８５℃未満（＜約８５℃）で、且つ温水熱交換器出口温度センサ５２による検出温度が設定値未満（＜設定値（後述））の時に、制御装置１３によってＯＮ側出口４５Ｂ側に切り替えられ、温水熱交換器４４から入口４５Ａを経て流入したエンジン冷却水を、ＯＮ側出口４５Ｂから循環ポンプ４７の吸込側を経てガスエンジン３０に付設の排ガス熱交換器（不図示）へ導く。この導かれたエンジン冷却水によりガスエンジン３０が冷却される。
【００５０】
また、温水三方弁４５は、エンジン出口温度センサ５３による検出温度が約９０℃以上（≧約９０℃）、または温水熱交換器出口温度センサ５２による検出温度が設定値以上（≧設定値）のときに、制御装置１３によってＯＦＦ側出口４５Ｃ側に切り替えられ、温水熱交換器４４から入口４５Ａを経て流入したエンジン冷却水を、ＯＦＦ側出口４５Ｃからラジエータ４６へ導く。
【００５１】
上記設定値は、温水供給系４９から取り出される温水の設定温度が約７０℃以上のときには、例えば約７３℃に設定される。この設定値を変えることによって、温水供給系４９から取り出される温水の温度が変更される。
【００５２】
制御装置１３は、温水三方弁４５をＯＦＦ側出口４５Ｃ側からＯＮ側出口４５Ｂ側へ切り替えるときには、この温水三方弁４５の頻繁な切替を防止するために、例えば１０分間の遅延タイマを設定する。従って、温水三方弁４５がＯＦＦ側出口４５Ｃ側に一旦切り替えられたときには、遅延タイマの設定時間（例えば１０分間）に相当する時間を経過したのちでなければ、ＯＮ側出口４５Ｂ側に切り替えられることがない。また、制御装置１３は、温水三方弁４５をＯＮ側出口４５Ｂ側からＯＦＦ側出口４５Ｃ側へ切り替えるときには遅延タイマを設定せず、エンジン冷却水を迅速に冷却させる。
【００５３】
前記ラジエータ４６は、エンジン冷却水を放熱して、このエンジン冷却水を約４０℃に冷却するものである。このラジエータ４６にて冷却されたエンジン冷却水は、循環ポンプ４７の吸込側を経てガスエンジン３０に付設の排ガス熱交換器へ戻され、ガスエンジン３０を冷却する。また、このラジエータ４６は、空気調和装置１０の室外熱交換器１９に隣接配置される。
【００５４】
上記冷却系バイパス管４８は、冷却水配管４２において、温水熱交換器４４の出口側とラジエータ４６の入口側とを連結して温水三方弁４５をバイパスするものである。つまり、この冷却系バイパス管４８は、温水三方弁４５が、温水熱交換器４４から流出したエンジン冷却水の大部分を、入口４５Ａを経てＯＮ側出口４５Ｂから循環ポンプ４７の吸込側へ導いているときに、温水熱交換器４４から流出したエンジン冷却水の一部、つまりエンジン冷却水の一定量を常時、冷却系バイパス管４８を経てラジエータ４６へ導くものである。これにより、温水熱交換器４４のみでは冷却（放熱）が不十分なエンジン冷却水の熱量がラジエータ４６にて放熱されることになる。
【００５５】
次に、上述のように構成されたエンジン冷却装置４１の作用を説明する。
【００５６】
空気調和装置１０（つまりガスエンジン３０）の停止時、または空気調和装置１０（つまりガスエンジン３０）の起動時には、制御装置１３は、エンジン冷却装置４１の温水三方弁４５をＯＦＦ側出口４５Ｃ側に切り替える。空気調和装置１０の起動時に、制御装置１３は遅延タイマを設定し、例えば遅延タイマを残り１０分からタイムカウントし、残り０分となった時点で、空気調和装置１０の運転状態に応じた後述の温水三方弁４５の切替を実行する。
【００５７】
空気調和装置１０の暖房運転時に、制御装置１３は、エンジン冷却装置４１の循環ポンプ４７を稼働させ、外部ポンプ５０を停止させ、温水三方弁４５をＯＦＦ側出口４５Ｃ側に切り替える。これにより、温水熱交換器４４から温水三方弁４５の入口４５Ａに流入したエンジン冷却水は、ＯＦＦ側出口４５Ｃからラジエータ４６へ導かれ、このラジエータ４６にて放熱される。これにより、エンジン冷却水に回収されてラジエータ４６により放熱されたガスエンジン３０の排熱は、空気調和装置１０の暖房運転時に蒸発器として機能する室外熱交換器１９に取り込まれ、この蒸発器の熱源として利用される。と同時に、ラジエータ４６にて放熱されたエンジン冷却水により、ガスエンジン３０が好適に冷却される。
【００５８】
また、空気調和装置１０の冷房運転時、即ち、冷暖自動運転の冷房運転時、ドライ運転時、及び冷暖自動運転の冷房運転以外の通常の冷房運転時に、制御装置１３は、エンジン冷却装置４１の循環ポンプ４７を稼働させ、外部ポンプ５０を稼働させ、更に、温水三方弁４５をＯＮ側出口４５Ｂ側またはＯＦＦ側出口４５Ｃ側に切り替える。
【００５９】
つまり、空気調和装置１０の冷房運転時に、温水供給系４９から取り出される温水の温度が約７０℃になるまでは、エンジン出口温度センサ５３によるエンジン冷却水の検出温度が約８５℃未満であり、かつ温水熱交換器出口温度センサ５２によるエンジン冷却水の検出温度が設定値（約７３℃）未満となっているので、制御装置１３は、温水三方弁４５をＯＮ側出口４５Ｂ側に切り替え、温水熱交換器４４から入口４５Ａに流入したエンジン冷却水を、ＯＮ側出口４５Ｂを経て循環ポンプ４７の吸込側へ導く。これにより、エンジン冷却水は、温水熱交換器４４により温水供給系４９の温水と熱交換されて冷却され、更に一部が冷却系バイパス管４８を経てラジエータ４６により放熱されて冷却され、その後ガスエンジン３０を冷却する。このとき、ラジエータ４６によるエンジン冷却水の放熱は最小限に抑えられる。
【００６０】
空気調和装置１０の冷房運転時に、温水供給系４９から取り出される温水の温度が約７０℃を越えると、温水熱交換器出口温度センサ５２によるエンジン冷却水の検出温度が設定値（例えば約７３℃）以上となるので、制御装置１３は、温水三方弁４５をＯＦＦ側出口４５Ｃ側に切り替える。また、ガスエンジン３０の負荷が大きく、エンジン出口温度センサ５３によるエンジン冷却水の検出温度が約９０℃以上となったときにも、制御装置１３は、温水三方弁４５をＯＦＦ側出口４５Ｃ側に切り替える。これにより、温水熱交換器４４から温水三方弁４５の入口４５Ａに流入したエンジン冷却水は、ＯＦＦ側出口４５Ｃを経てラジエータ４６へ導かれる。従って、エンジン冷却水は、全てが、温水熱交換器４４により温水供給系４９の温水と熱交換されて冷却され、更にラジエータ４６により放熱されて冷却され、その後ガスエンジン３０を冷却する。
【００６１】
このように、エンジン冷却水の全てがラジエータ４６により放熱されて冷却されるので、エンジン冷却水は、局部沸騰が防止されて気泡滞留による流れの阻害が回避され、この結果、エンジンを有効に冷却できると共に、エンジンオイルの劣化を防止できる。
【００６２】
空気調和装置１０の冷却運転時に、温水三方弁４５がＯＦＦ側出口４５Ｃ側に切り替わった結果、エンジン冷却装置４１におけるエンジン冷却水の温度と、温水供給系４９から取り出される温水温度とが共に低下し、エンジン出口温度センサ５３によるエンジン冷却水の検出温度が約８５℃未満となり、且つ温水熱交換器出口温度センサ５２によるエンジン冷却水の検出温度が設定値（例えば約７３℃）未満となると、遅延タイマの設定時間経過後に、制御装置１３は温水三方弁４５をＯＮ側出口４５Ｂ側に切り替える。これにより、ラジエータ４６からのエンジン冷却水の放熱量が再び抑制される。
【００６３】
ここで、空気調和装置１０の冷房運転時に外部ポンプ５０が停止されていると、温水熱交換器４４にて熱交換が実行されない。従って、温水熱交換器出口温度センサ５２にて検出されるエンジン冷却水の温度が、エンジン出口温度センサ５３にて検出されるエンジン冷却水の温度とほぼ等しくなる。このため、この空気調和装置１０の冷房運転時に、温水熱交換器出口温度センサ５２にて検出されるエンジン冷却水の温度はやがて設定値（例えば約７３℃）を越えることになり、制御装置１３は、前述の如く、温水三方弁４５をＯＦＦ側出口４５Ｃ側に切り替える。この状態は外部ポンプ５０が稼働するまで維持され、ラジエータ４６により冷却されたエンジン冷却水によって、ガスエンジン３０が良好に冷却される。
【００６４】
以上のことから、上記実施の形態によれば次の効果▲１▼及び▲２▼を奏する。
【００６５】
▲１▼エンジン冷却装置４１における温水熱交換器４４の下流側に配置された温水三方弁４５が、ラジエータ４６と循環ポンプ４７へ導くエンジン冷却水の調整を、ガスエンジン３０を冷却した直後のエンジン冷却水の温度（エンジン出口温度センサ５３による検出温度）と、温水熱交換器４４により熱交換された直後のエンジン冷却水の温度（温水熱交換器出口温度センサ５２による検出温度）とに基づいて実行することから、温水熱交換器４４にて熱交換されて冷却されたエンジン冷却水を、ラジエータ４６にて必要以上に冷却することを防止できる。この結果、温水熱交換器４４の熱交換効率を向上させて、温水供給系４９により高温の温水を取り出すことができる。と同時に、ガスエンジン３０の冷却に支障が生じないようにエンジン冷却水の温度を維持できるので、このエンジン冷却水によるガスエンジン３０の冷却を好適に実施できる。
【００６６】
▲２▼温水供給系４９から取り出される温水温度が約６０〜８０℃の範囲では、温水熱交換器４４にて熱交換された直後のエンジン冷却水の温度は、温水供給系４９から温水熱交換器４４へ流入する温水の温度（約６０℃）を変化させたときに最も大きく変化し、且つ温水供給系４９を流れる温水の流量が変動しても変化が少ない。このため、温水熱交換器出口温度センサ５２が、冷却水配管４２において温水熱交換器４４の下流側で且つ温水三方弁４５の上流側に設置されて、温水熱交換器４４にて熱交換された直後のエンジン冷却水の温度を検出し、この検出温度を温水熱交換器出口温度センサ５２の切替制御用に使用することによって、温水供給系４９を流れる温水の流量が広範囲に変動しても、温水供給系４９から取り出される温水温度を、約６０〜８０℃の範囲で高精度に制御することができる。
【００６７】
［Ｂ］第２の実施の形態
この第２の実施の形態では、温水三方弁４５は切替式三方弁ではなく、入口４５Ａに流入したエンジン冷却水の流量を、ＯＮ側出口４５Ｂ側とＯＦＦ側出口４５Ｃ側とへ分配して流す比例式三方弁である。この比例式の温水三方弁４５は、入口４５Ａに流入したエンジン冷却水の一部をＯＦＦ側出口４５Ｃからラジエータ４６へ導き、残りをＯＮ側出口４５Ｂから循環ポンプ４７の吸込側へ導くことが可能となるので、冷却系バイパス管４８が不用となる。
【００６８】
この比例式の温水三方弁４５はモータにより駆動され、このモータを制御装置１３が制御して、温水三方弁４５のＯＮ側出口４５ＢとＯＦＦ側出口４５Ｃとの開度を設定する。
【００６９】
つまり、エンジン出口温度センサ５３にて検出されたエンジン冷却水温度が約７０℃未満の場合に、制御装置１３は、温水三方弁４５のＯＮ側出口４５Ｂを１％／ｓｅｃの開度速度で開けて、エンジン冷却水の温度を上昇させる。また、エンジン出口温度センサ５３にて検出されたエンジン冷却水温度が約９０℃以上の場合に、制御装置１３は、温水三方弁４５のＯＦＦ側出口４５Ｃを５％／ｓｅｃの開度速度で開けて、ラジエータ４６の放熱によりエンジン冷却水を冷却させる。
【００７０】
エンジン出口温度センサ５３にて検出されたエンジン冷却水温度が約７０℃以上約９０℃未満の場合で、且つ、温水熱交換器出口温度センサ５２にて検出されたエンジン冷却水温度と設定値（例えば約７３℃）との温度差が３℃以上、即ち
（設定値）−（温水熱交換器出口温度センサ５２による検出温度）≧３℃
の場合に、制御装置１３は、温水三方弁４５のＯＮ側出口４５Ｂを１％／ｓｅｃの開度速度で開けて、ラジエータ４６によるエンジン冷却水の放熱を抑制する。
【００７１】
また、エンジン出口温度センサ５３にて検出されたエンジン冷却水温度が約７０℃以上約９０℃未満の場合で、且つ、温水熱交換器出口温度センサ５２にて検出されたエンジン冷却水温度と設定値（例えば約７３℃）との温度差が−３℃未満、即ち
（設定値）−（温水熱交換器出口温度センサ５２による検出温度）＜−３℃
の場合に、制御装置１３は、温水三方弁４５のＯＦＦ側出口４５Ｃを１％／ｓｅｃの開度速度で開けて、ラジエータ４６の放熱によりエンジン冷却水を冷却させる。
【００７２】
従って、上記第２の実施の形態によっても、温水三方弁４５が循環ポンプ４７側とラジエータ４６側とへ導くエンジン冷却水を、温水熱交換器出口温度センサ５２とエンジン出口温度センサ５３との検出温度に基づき調整することから、前記第１の実施の形態の効果▲１▼及び▲２▼と同様な効果を奏する。
【００７３】
以上、本発明を上記実施の形態に基づいて説明したが、本発明はこれに限定されるものではない。
【００７４】
【発明の効果】
請求項１に記載の発明に係るエンジン冷却方法によれば、第１媒体によりエンジンを好適に冷却できると共に、熱交換器の熱交換効率を向上させて高温の第２媒体を取り出すことができる。
【００７５】
また、請求項５に記載の発明に係るエンジン冷却装置によれば、第１媒体によりエンジンを好適に冷却できると共に、熱交換器の熱交換効率を向上させて高温の第２媒体を取り出すことができる。
【００７６】
更に、請求項１０に記載の発明に係る冷凍装置によれば、エンジン冷却装置を流れる第１媒体によりエンジンを好適に冷却できると共に、エンジン冷却装置の熱交換器の熱交換効率を向上させて高温の第２媒体を取り出すことができる。
【図面の簡単な説明】
【図１】本発明に係る冷凍装置の一実施の形態が適用された空気調和装置の冷媒回路を示す回路図である。
【図２】従来の冷凍装置としての空気調和装置の冷媒回路を示す回路図である。
【符号の説明】
１０空気調和装置（冷凍装置）
１３制御装置
１６圧縮機
１９室外熱交換器
２１Ａ、２１Ｂ室内熱交換器
２２Ａ、２２Ｂ室内膨張弁
２４室外膨張弁
３０ガスエンジン
４１エンジン冷却装置
４４温水熱交換器（熱交換器）
４５温水三方弁（三方弁）
４５Ａ温水三方弁の入口
４５Ｂ温水三方弁のＯＮ側出口
４５Ｃ温水三方弁のＯＦＦ側出口
４６ラジエータ
４７循環ポンプ
４８冷却系バイパス管
４９温水供給系
５２温水熱交換器出口温度センサ
５３エンジン出口温度センサ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine cooling method and apparatus that cools an engine and uses the exhaust heat of the engine, and a compressor that is driven by the engine and that includes the engine cooling apparatus.
[0002]
[Prior art]
As shown in FIG. 2, a gas heat pump type air conditioner in which a compressor 101 is driven by a gas engine 102 is known as an air conditioner 100 as a refrigeration apparatus. In such an air conditioner 100, the outdoor unit 103 includes the compressor 101, the four-way valve 105, the outdoor heat exchanger 106, and the outdoor expansion valve 107, and the indoor unit 104 includes the indoor heat exchanger 108 and the indoor expansion valve 109. It is configured with.
[0003]
By switching the four-way valve 105, during the cooling operation, the outdoor heat exchanger 106 becomes a condenser, the indoor heat exchanger 108 becomes an evaporator, and the indoor heat exchanger 108 cools the room by the evaporation heat of the refrigerant. In the heating operation by switching the four-way valve 105, the outdoor heat exchanger 106 serves as an evaporator, the indoor heat exchanger 108 serves as a condenser, and the indoor heat exchanger 108 heats the room due to the heat of condensation of the refrigerant.
[0004]
The gas engine 102 that drives the compressor 101 that compresses the refrigerant is cooled by the engine cooling device 110. The engine cooling device 110 has one end connected to an exhaust gas heat exchanger (not shown) attached to the gas engine 102 via the gas engine 102 and the other end connected directly to the exhaust gas heat exchanger. Further, a hot water heat exchanger 114, a wax three-way valve 112, a radiator 115, and a circulation pump 116 are disposed in a substantially closed-loop cooling water pipe 111, and the wax three-way valve 112 and the radiator 115 are arranged in parallel.
[0005]
The engine coolant recovered from the exhaust heat of the gas engine 102 is circulated in the coolant pipe 111 by the operation of the circulation pump 116, and is cooled (heat radiated) by the hot water heat exchanger 114 and the radiator 115 during this period, or hot water heat The gas engine 102 is cooled (heat radiation) only by the exchanger 114, thereby cooling the gas engine 102.
[0006]
The warm water heat exchanger 114 exchanges heat between the warm water flowing through the warm water supply system 117 and the engine coolant during the cooling operation of the air conditioner 100, and the heated warm water is effectively used.
[0007]
Conventionally, the temperature of hot water heated and taken out by the hot water heat exchanger 114 is typically about 45 ° C. At this time, the set temperature of the wax three-way valve 112 is about 60 to 70 ° C.
[0008]
Accordingly, the engine coolant that has flowed out of the hot water heat exchanger 114 is all guided to the suction side of the circulation pump 116 by the wax three-way valve 112 when the temperature is lower than 60 ° C. When the temperature of the engine cooling water flowing out from the hot water heat exchanger 114 is 70 ° C. or higher, all of this engine cooling water is led to the radiator 115 side, and the engine cooling water cooled (radiated) by the radiator 115 is converted into wax. It returns to the suction side of the circulation pump 116 via the three-way valve 112. When the temperature of the engine cooling water flowing out from the hot water heat exchanger 114 is 60 ° C. or higher and lower than 70 ° C., the wax three-way valve 112 guides the engine cooling water to both the suction side of the circulation pump 116 and the radiator 115 side.
[0009]
[Problems to be solved by the invention]
In the engine cooling device 110 as described above, when the temperature of hot water heated and taken out by the hot water heat exchanger 114 is about 70 ° C., the set temperature of the wax three-way valve 112 is about 65 to 75 ° C. or more. Therefore, the engine cooling water flowing out from the hot water heat exchanger 114 is returned to the gas engine 102 without being led to the radiator 115 to be cooled (heat radiation) until the temperature reaches about 65 ° C. or higher.
[0010]
For this reason, the engine cooling water may reach a temperature of about 90 ° C. or higher in the gas engine 102, boil locally, and the flow may be hindered by the retention of bubbles. In such a case, there is a possibility that problems such as insufficient cooling of the gas engine 102 and deterioration of engine oil may occur.
[0011]
The object of the present invention has been made in consideration of the above-mentioned circumstances. The engine can be suitably cooled by the first medium (for example, engine cooling water), and the heat exchange efficiency of the heat exchanger can be improved to increase the temperature. An object of the present invention is to provide an engine cooling method and apparatus and a refrigeration apparatus capable of taking out a second medium (for example, hot water).
[0012]
[Means for Solving the Problems]
 According to the first aspect of the present invention, the first medium for recovering exhaust heat of the engine is cooled by a heat exchanger and a radiator and circulated to cool the engine, and the first medium is cooled by the heat exchanger. In the engine cooling method for exchanging heat with the second medium, the engine cooling method is disposed downstream of the heat exchanger.The inlet is connected to the heat exchanger side and one outlet is connected to the radiator side and the other outlet is connected to the engine side.The three-way valve includes a temperature of the first medium immediately after cooling the engine, and a temperature of the first medium immediately after heat exchange by the heat exchanger.A set value of the first medium set based on a set temperature after heat exchange of the second medium;To control the first medium led from the three-way valve to the radiator and the engine.And distributes the flow rate of the first medium that leads to the radiator and the engine.It is characterized by doing.
[0013]
 The invention according to claim 2 is the invention according to claim 1,The three-way valve is a switching type three-way valve, and the temperature of the first medium immediately after cooling the engine, the temperature of the first medium immediately after heat exchange by the heat exchanger, and the heat of the second medium. Based on the set value of the first medium set based on the set temperature after replacement, the first medium flowing out from the heat exchanger is alternatively guided to the radiator and the engine, and the heat exchange The outlet side of the heat exchanger and the inlet side of the radiator are connected by a bypass pipe that guides a part of the first medium flowing out of the heater to the radiator without passing through the three-way valve. It is.
According to a third aspect of the present invention, in the second aspect of the present invention, when the three-way valve is once switched so that the first medium is guided to the radiator, a time corresponding to a set time of a delay timer. The three-way valve cannot be switched so that the first medium is guided to the engine unless the time elapses.
The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the first medium is engine cooling water and the second medium is hot water. .
[0014]
 Claim5The first medium for recovering exhaust heat of the engine is cooled and circulated by a heat exchanger and a radiator to cool the engine, and the heat exchanger includes the first medium and the second medium. And an engine cooling device configured to exchange heat with the heat exchanger.The inlet is connected to the heat exchanger side and one outlet is connected to the radiator side and the other outlet is connected to the engine side.The three-way valve includes a temperature of the first medium immediately after cooling the engine, and a temperature of the first medium immediately after heat exchange by the heat exchanger.A set value of the first medium set based on a set temperature after heat exchange of the second medium;Adjust the first medium leading to the radiator and the engine based onAnd distributes the flow rate of the first medium that leads to the radiator and the engine.It is characterized by being comprised.
[0015]
 Claim6The invention described in claim5In the invention described in (1), the three-way valve is a switching three-way valve, and the temperature of the first medium immediately after cooling the engine and the temperature of the first medium immediately after heat exchange by the heat exchangerA set value of the first medium set based on a set temperature after heat exchange of the second medium;The first medium that has flowed out of the heat exchanger is guided to the radiator and the engine alternatively.In addition, the outlet side of the heat exchanger and the inlet side of the radiator are connected by a bypass pipe that guides a part of the first medium flowing out from the heat exchanger to the radiator without passing through the three-way valve. RuIt is characterized by this.
 According to a seventh aspect of the invention, in the sixth aspect of the invention, when the three-way valve is once switched so that the first medium is guided to the radiator, a time corresponding to a set time of a delay timer The three-way valve cannot be switched so that the first medium is guided to the engine unless the time elapses.
[0016]
 Claim8The invention described in claim5The three-way valve is a proportional three-way valve, and the temperature of the first medium immediately after cooling the engine and the temperature of the first medium immediately after heat exchange by the heat exchangerA set value of the first medium set based on a set temperature after heat exchange of the second medium;Based on the above, the flow rate of the first medium flowing out from the heat exchanger is distributed and guided to the radiator and the engine.
[0017]
 Claim9The invention described inClaims 5-8In any one of the inventions, the first medium is engine cooling water, and the second medium is hot water.
[0018]
 Claim10In the invention described in the above, a refrigerant circulates through a compressor, a condenser, an expansion mechanism, and an evaporator that are sequentially connected, and the compressor is driven by an engine and has an engine cooling device. A first medium for recovering exhaust heat of the engine is cooled and circulated by a heat exchanger and a radiator to cool the engine, and the heat exchanger exchanges heat between the first medium and the second medium. In the refrigeration apparatus configured as described above, the engine cooling apparatus is disposed downstream of the heat exchanger.The inlet is connected to the heat exchanger side and one outlet is connected to the radiator side and the other outlet is connected to the engine side.The three-way valve includes a temperature of the first medium immediately after cooling the engine, and a temperature of the first medium immediately after heat exchange by the heat exchanger.A set value of the first medium set based on a set temperature after heat exchange of the second medium;Adjust the first medium leading to the radiator and the engine based onAnd distributes the flow rate of the first medium that leads to the radiator and the engine.It is characterized by being comprised.
[0019]
 Claim11The invention described in claim10In the present invention, the three-way valve in the engine cooling device is a switching three-way valve, and the temperature of the first medium immediately after cooling the engine and the temperature of the first medium immediately after heat exchange by the heat exchanger. WhenA set value of the first medium set based on a set temperature after heat exchange of the second medium;The first medium that has flowed out of the heat exchanger is guided to the radiator and the engine alternatively.In addition, the outlet side of the heat exchanger and the inlet side of the radiator are connected by a bypass pipe that guides a part of the first medium flowing out from the heat exchanger to the radiator without passing through the three-way valve. It is characterized by that.
According to a twelfth aspect of the present invention, in the invention of the eleventh aspect, when the three-way valve is once switched so that the first medium is guided to the radiator, a time corresponding to a set time of a delay timer. The three-way valve cannot be switched so that the first medium is guided to the engine unless the time elapses.
[0020]
 Claim13The invention described in claim10In the present invention, the three-way valve in the engine cooling device is a proportional three-way valve, and the temperature of the first medium immediately after cooling the engine and the temperature of the first medium immediately after heat exchange by the heat exchanger. WhenA set value of the first medium set based on a set temperature after heat exchange of the second medium;Based on the above, the flow rate of the first medium flowing out from the heat exchanger is distributed and guided to the radiator and the engine.
[0021]
 Claim14The invention described inClaims 10-13In the invention according to any one of the above, the first medium in the engine cooling device is engine cooling water, and the second medium is hot water.
[0022]
 Claims 1-14The invention described in (1) has the following effects.
[0023]
 A three-way valve arranged on the downstream side of the heat exchanger in the engine cooling device adjusts the first medium that leads to the radiator and the engine, and heat is exchanged by the heat exchanger and the temperature of the first medium immediately after cooling the engine. The temperature of the first medium immediately afterA set value of the first medium set based on a set temperature after heat exchange of the second medium;Therefore, it is possible to prevent the first medium cooled by the heat exchange by the heat exchanger from being cooled more than necessary by the radiator, so that the heat exchange efficiency of the heat exchanger is improved and the high temperature is increased. The second medium can be taken out, and the temperature of the first medium can be maintained so as not to hinder the cooling of the engine. Therefore, the engine can be suitably cooled by the first medium.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
[A] First embodiment
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
FIG. 1 is a circuit diagram showing a refrigerant circuit of an air conditioner to which an embodiment of a refrigeration apparatus according to the present invention is applied.
[0026]
As shown in FIG. 1, a heat pump air conditioner 10 as a refrigeration apparatus includes an outdoor unit 11, a plurality of (for example, two) indoor units 12 A and 12 B, and a control device 13. The outdoor refrigerant pipe 14 is connected to the indoor refrigerant pipes 15A and 15B of the indoor units 12A and 12B.
[0027]
The outdoor unit 11 is installed outside, a compressor 16 is disposed in the outdoor refrigerant pipe 14, an accumulator 17 is disposed on the suction side of the compressor 16, and a four-way valve 18 is disposed on the discharge side. An outdoor heat exchanger 19, an outdoor expansion valve 24, and a dry core 25 are sequentially arranged on the four-way valve 18 side. An outdoor fan 20 that blows air toward the outdoor heat exchanger 19 is disposed adjacent to the outdoor heat exchanger 19. The compressor 16 is connected to the gas engine 30 via the flexible coupling 27 and the like, and is driven by the gas engine 30. Further, a refrigerant system bypass pipe 26 is disposed to bypass the outdoor expansion valve 24.
[0028]
On the other hand, the indoor units 12A and 12B are installed indoors, indoor heat exchangers 21A and 21B are disposed in the indoor refrigerant pipes 15A and 15B, respectively, and indoor heat exchangers are provided in the indoor refrigerant pipes 15A and 15B, respectively. Indoor expansion valves 22A and 22B are arranged in the vicinity of 21A and 21B. Indoor fans 23A and 23B for blowing air to the indoor heat exchangers 21A and 21B are disposed adjacent to the indoor heat exchangers 21A and 21B.
[0029]
In addition, the code | symbol 28 in FIG. 1 shows a strainer. Reference numeral 29 denotes a safety valve that releases the refrigerant pressure on the discharge side of the compressor 16 to the suction side of the compressor 16.
[0030]
The control device 13 controls the operation of the outdoor unit 11 and the indoor units 12A and 12B. Specifically, the gas engine 30 (that is, the compressor 16), the four-way valve 18, the outdoor fan 20 and the outdoor unit 11 in the outdoor unit 11 are controlled. The outdoor expansion valve 24, the indoor expansion valves 22A and 22B, and the indoor fans 23A and 23B in the indoor units 12A and 12B are controlled. Further, the control device 13 controls a circulation pump 47, a hot water three-way valve 45, an external pump 50, and the like of the engine cooling device 41 described later.
[0031]
By switching the four-way valve 18 by the control device 13, the heat pump type air conditioner 10 is set to the cooling operation or the heating operation. That is, when the control device 13 switches the four-way valve 18 to the cooling side, the refrigerant flows as indicated by solid arrows, the outdoor heat exchanger 19 becomes a condenser, and the indoor heat exchangers 21A and 21B become evaporators to perform a cooling operation. Each indoor heat exchanger 21A, 21B cools the room. Further, when the control device 13 switches the four-way valve 18 to the heating side, the refrigerant flows as indicated by broken arrows, the indoor heat exchangers 21A and 21B become condensers, and the outdoor heat exchanger 19 becomes an evaporator and heating operation is performed. It will be in a state and each indoor heat exchanger 21A, 21B will heat a room | chamber interior.
[0032]
Moreover, the control apparatus 13 controls each valve opening degree of indoor expansion valve 22A, 22B according to an air-conditioning load at the time of air_conditionaing | cooling operation. During this cooling operation, the refrigerant bypasses the outdoor expansion valve 24 and flows through the refrigerant system bypass pipe 26. During the heating operation, the control device 13 controls the valve openings of the outdoor expansion valve 24 and the indoor expansion valves 22A and 22B according to the air conditioning load.
[0033]
On the other hand, an air-fuel mixture is supplied from an engine fuel supply device 31 to a combustion chamber (not shown) of the gas engine 30 that drives the compressor 16. In the engine fuel supply device 31, two fuel cutoff valves 33, a zero governor 34, a fuel adjustment valve 35, and an actuator 36 are sequentially disposed in a fuel supply pipe 32. The gas engine 30 is configured to be connected to the combustion chamber.
[0034]
Two fuel shut-off valves 33 are arranged in series to form a two-closed type fuel shut-off valve mechanism, and the two fuel shut-off valves 33 are interlocked to be fully closed or fully opened so that fuel gas does not leak. And communication.
[0035]
The zero governor 34 is caused by fluctuations in the primary pressure a among the primary fuel gas pressure (primary pressure a) and the secondary fuel gas pressure (secondary pressure b) before and after the zero governor 34 in the fuel supply pipe 32. Also, the secondary pressure b is adjusted to a constant predetermined pressure to stabilize the operation of the gas engine 30.
[0036]
The fuel adjustment valve 35 optimally adjusts the air-fuel ratio of the air-fuel mixture generated by introducing air from the upstream side of the actuator 36. Further, the actuator 36 controls the rotational speed of the gas engine 30 by adjusting the supply amount of the air-fuel mixture supplied to the combustion chamber of the gas engine 30.
[0037]
An engine oil supply device 37 is connected to the gas engine 30. The engine oil supply device 37 is provided with an oil shutoff valve 39, an oil supply pump 40, and the like in an oil supply pipe 38, and appropriately supplies engine oil to the gas engine 30.
[0038]
The control of the gas engine 30 by the control device 13 is specifically performed by the fuel cutoff valve 33 of the engine fuel supply device 31, the zero governor 34, the fuel adjustment valve 35 and the actuator 36, and the oil cutoff valve 39 of the engine oil supply device 37. The control device 13 controls the oil supply pump 40.
[0039]
The gas engine 30 is cooled by engine cooling water as a first medium circulating in the engine cooling device 41. The engine cooling device 41 has a substantially closed loop in which one end is connected to an exhaust gas heat exchanger (not shown) attached to the gas engine 30 via the gas engine 30 and the other end is directly connected to the exhaust gas heat exchanger. A wax three-way valve 43, a hot water heat exchanger 44 as a heat exchanger, a hot water three-way valve 45, a radiator 46, and a circulation pump 47 are sequentially arranged in a cooling water pipe 42 having a shape, and a cooling system bypass pipe 48 and a hot water supply system 49 It is comprised.
[0040]
The circulation pump 47 boosts the engine cooling water during operation and circulates the engine cooling water in the cooling water pipe 42.
[0041]
The wax three-way valve 43 is for quickly warming up the gas engine 30. The wax three-way valve 43 has an inlet 43A on the side of the exhaust gas heat exchanger attached to the gas engine 30 in the cooling water pipe 42, a low temperature side outlet 43B on the suction side of the circulation pump 47 in the cooling water pipe 42, and a high temperature side outlet. 43C is connected to the hot water heat exchanger 44 side in the cooling water pipe 42, respectively.
[0042]
The engine cooling water flows into the exhaust gas heat exchanger attached to the gas engine 30 at about 40 ° C. from the discharge side of the circulation pump 47 and recovers exhaust heat (heat of exhaust gas) from the gas engine 30. The gas engine 30 is cooled to 30 ° C. and heated to about 80 ° C. The engine coolant flowing into the wax three-way valve 43 from the gas engine 30 is returned to the circulation pump 47 from the low-temperature side outlet 43B when the temperature is low (for example, 80 ° C. or lower), and the gas engine 30 is quickly warmed up. When it is 80 ° C. or higher), it flows from the high temperature side outlet 43C to the hot water heat exchanger 44.
[0043]
This hot water heat exchanger 44 exchanges heat between the hot water as the second medium flowing in the external pipe 51 of the hot water supply system 49 provided with the external pump 50 and the engine cooling water flowing in from the wax three-way valve 43, The hot water in the hot water supply system 49 is heated by the exhaust heat of the gas engine 30 to raise the temperature.
[0044]
The hot water in the hot water supply system 49 flows into the hot water heat exchanger 44 at about 60 ° C., for example, and is heated to about 70 ° C. by the hot water heat exchanger 44 and supplied to an external utilization unit. The hot water of the hot water supply system 49 thus heated is used for hot water supply or for drying the dehumidifying agent of the desiccant air conditioner. Here, the desiccant air conditioner is an air conditioner that enables dehumidification using a dehumidifying agent without lowering the room temperature.
[0045]
The engine cooling water heat-exchanged with the hot water of the hot water supply system 49 by the hot water heat exchanger 44 is cooled (cooled) to about 65 ° C. and flows to the hot water three-way valve 45.
[0046]
The hot water three-way valve 45 is arranged on the downstream side of the hot water heat exchanger 44 with the inlet 45 A connected to the hot water heat exchanger 44 side in the cooling water pipe 42. The ON-side outlet 45B of the hot water three-way valve 45 is connected to the suction side of the circulation pump 47 in the cooling water pipe 42, and the OFF-side outlet 45C of the hot water three-way valve 45 is connected to the radiator 46 side in the cooling water pipe 42. Connected.
[0047]
In this embodiment, the hot water three-way valve 45 allows the engine cooling water flowing from the hot water heat exchanger 44 through the inlet 45A to the suction side of the circulation pump 47 via the ON side outlet 45B or the OFF side outlet 45C. It is a switchable three-way valve that leads to the radiator 46 through the alternative. The hot water three-way valve 45 is driven by a motor (not shown), and the control device 13 controls this motor.
[0048]
Here, in the cooling water pipe 42, a hot water heat exchanger outlet temperature sensor 52 is installed between the hot water heat exchanger 44 and the inlet 45 A of the hot water three-way valve 45. The temperature of the engine coolant immediately after heat exchange in the hot water heat exchanger 44 is detected by the hot water heat exchanger outlet temperature sensor 52, and this detected temperature is transmitted to the control device 13. Further, an engine outlet temperature sensor 53 is installed in the cooling water pipe 42 between the gas engine 30 and the wax three-way valve 43. The engine outlet temperature sensor 53 detects the temperature of the engine coolant immediately after cooling the gas engine 30, and transmits this detected temperature to the control device 13.
[0049]
The hot water three-way valve 45 has a temperature detected by the engine outlet temperature sensor 53 of less than about 85 ° C. (<about 85 ° C.) and a temperature detected by the hot water heat exchanger outlet temperature sensor 52 of less than a set value (<set value (described later). )), The engine cooling water switched from the hot water heat exchanger 44 through the inlet 45A to the gas outlet through the suction side of the circulation pump 47 is switched to the ON side outlet 45B side by the control device 13. 30 to an exhaust gas heat exchanger (not shown) attached thereto. The gas engine 30 is cooled by the guided engine coolant.
[0050]
In the hot water three-way valve 45, the temperature detected by the engine outlet temperature sensor 53 is about 90 ° C. or higher (≧ about 90 ° C.), or the temperature detected by the hot water heat exchanger outlet temperature sensor 52 is higher than a set value (≧ set value). Sometimes, the control device 13 switches to the OFF-side outlet 45C side, and the engine cooling water flowing from the hot water heat exchanger 44 through the inlet 45A is guided to the radiator 46 from the OFF-side outlet 45C.
[0051]
The set value is set to about 73 ° C., for example, when the set temperature of hot water taken out from the hot water supply system 49 is about 70 ° C. or higher. By changing this set value, the temperature of the hot water taken out from the hot water supply system 49 is changed.
[0052]
When switching the hot water three-way valve 45 from the OFF-side outlet 45C side to the ON-side outlet 45B side, the control device 13 sets, for example, a 10-minute delay timer to prevent frequent switching of the hot water three-way valve 45. Therefore, when the hot water three-way valve 45 is once switched to the OFF-side outlet 45C side, it is switched to the ON-side outlet 45B side after a time corresponding to the set time of the delay timer (for example, 10 minutes) has not elapsed. There is no. Further, the control device 13 quickly cools the engine coolant without setting the delay timer when the hot water three-way valve 45 is switched from the ON side outlet 45B side to the OFF side outlet 45C side.
[0053]
The radiator 46 radiates engine cooling water and cools the engine cooling water to about 40 ° C. The engine cooling water cooled by the radiator 46 is returned to the exhaust gas heat exchanger attached to the gas engine 30 through the suction side of the circulation pump 47 to cool the gas engine 30. The radiator 46 is disposed adjacent to the outdoor heat exchanger 19 of the air conditioner 10.
[0054]
The cooling system bypass pipe 48 connects the outlet side of the hot water heat exchanger 44 and the inlet side of the radiator 46 in the cooling water pipe 42 to bypass the hot water three-way valve 45. That is, in the cooling system bypass pipe 48, the hot water three-way valve 45 guides most of the engine cooling water flowing out from the hot water heat exchanger 44 from the ON side outlet 45B to the suction side of the circulation pump 47 via the inlet 45A. When the engine is running, a part of the engine cooling water flowing out from the hot water heat exchanger 44, that is, a certain amount of the engine cooling water is always led to the radiator 46 through the cooling system bypass pipe 48. As a result, the amount of heat of engine cooling water that is insufficiently cooled (radiated) by the hot water heat exchanger 44 alone is radiated by the radiator 46.
[0055]
Next, the operation of the engine cooling device 41 configured as described above will be described.
[0056]
When the air conditioner 10 (that is, the gas engine 30) is stopped or when the air conditioner 10 (that is, the gas engine 30) is started, the control device 13 moves the hot water three-way valve 45 of the engine cooling device 41 to the OFF-side outlet 45C side. Switch. When the air conditioner 10 is started, the control device 13 sets a delay timer, for example, counts the delay timer from the remaining 10 minutes, and when the remaining time becomes 0 minutes, the control device 13 will be described later according to the operating state of the air conditioner 10. The hot water three-way valve 45 is switched.
[0057]
During the heating operation of the air conditioner 10, the control device 13 operates the circulation pump 47 of the engine cooling device 41, stops the external pump 50, and switches the hot water three-way valve 45 to the OFF-side outlet 45C side. Thus, the engine coolant that has flowed from the hot water heat exchanger 44 into the inlet 45 A of the hot water three-way valve 45 is guided to the radiator 46 from the OFF-side outlet 45 C and is radiated by the radiator 46. As a result, the exhaust heat of the gas engine 30 recovered in the engine cooling water and radiated by the radiator 46 is taken into the outdoor heat exchanger 19 that functions as an evaporator during the heating operation of the air conditioner 10. Used as a heat source. At the same time, the gas engine 30 is suitably cooled by the engine cooling water radiated by the radiator 46.
[0058]
Further, during the cooling operation of the air conditioner 10, that is, during the cooling operation of the cooling / heating automatic operation, during the dry operation, and during the normal cooling operation other than the cooling operation of the cooling / heating automatic operation, the control device 13 includes the engine cooling device 41. The circulation pump 47 is operated, the external pump 50 is operated, and the hot water three-way valve 45 is switched to the ON side outlet 45B side or the OFF side outlet 45C side.
[0059]
That is, during the cooling operation of the air conditioner 10, the detected temperature of the engine cooling water by the engine outlet temperature sensor 53 is less than about 85 ° C. until the temperature of the hot water taken out from the hot water supply system 49 reaches about 70 ° C. In addition, since the detected temperature of the engine cooling water by the hot water heat exchanger outlet temperature sensor 52 is less than the set value (about 73 ° C.), the control device 13 switches the hot water three-way valve 45 to the ON side outlet 45B side, The engine coolant flowing into the inlet 45A from the heat exchanger 44 is guided to the suction side of the circulation pump 47 via the ON side outlet 45B. As a result, the engine cooling water is cooled by exchanging heat with the hot water of the hot water supply system 49 by the hot water heat exchanger 44, and a part of the engine cooling water is radiated and cooled by the radiator 46 via the cooling system bypass pipe 48, and then cooled. The engine 30 is cooled. At this time, the heat radiation of the engine cooling water by the radiator 46 is minimized.
[0060]
When the temperature of the hot water taken out from the hot water supply system 49 exceeds about 70 ° C. during the cooling operation of the air conditioner 10, the detected temperature of the engine cooling water by the hot water heat exchanger outlet temperature sensor 52 is set to a set value (for example, about 73 ° C.). Therefore, the control device 13 switches the hot water three-way valve 45 to the OFF-side outlet 45C side. Further, when the load of the gas engine 30 is large and the detected temperature of the engine cooling water by the engine outlet temperature sensor 53 becomes about 90 ° C. or higher, the control device 13 moves the hot water three-way valve 45 to the OFF side outlet 45C side. Switch. As a result, the engine coolant flowing from the hot water heat exchanger 44 into the inlet 45A of the hot water three-way valve 45 is guided to the radiator 46 via the OFF side outlet 45C. Accordingly, all of the engine cooling water is cooled by exchanging heat with the hot water of the hot water supply system 49 by the hot water heat exchanger 44, further radiated by the radiator 46 and cooled, and then the gas engine 30 is cooled.
[0061]
In this way, since all the engine cooling water is radiated and cooled by the radiator 46, the engine cooling water is prevented from local boiling and obstruction of the flow due to air bubble retention, and as a result, the engine is effectively cooled. In addition, the engine oil can be prevented from deteriorating.
[0062]
As a result of the hot water three-way valve 45 being switched to the OFF-side outlet 45C during the cooling operation of the air conditioner 10, the temperature of the engine cooling water in the engine cooling device 41 and the temperature of the hot water taken out from the hot water supply system 49 both decrease. When the detected temperature of the engine cooling water by the engine outlet temperature sensor 53 becomes less than about 85 ° C. and the detected temperature of the engine cooling water by the hot water heat exchanger outlet temperature sensor 52 becomes less than a set value (for example, about 73 ° C.), a delay occurs. After the timer set time has elapsed, the control device 13 switches the hot water three-way valve 45 to the ON side outlet 45B side. Thereby, the heat radiation amount of the engine cooling water from the radiator 46 is suppressed again.
[0063]
Here, if the external pump 50 is stopped during the cooling operation of the air conditioner 10, heat exchange is not performed in the hot water heat exchanger 44. Accordingly, the temperature of the engine cooling water detected by the hot water heat exchanger outlet temperature sensor 52 is substantially equal to the temperature of the engine cooling water detected by the engine outlet temperature sensor 53. For this reason, during the cooling operation of the air conditioner 10, the temperature of the engine coolant detected by the hot water heat exchanger outlet temperature sensor 52 eventually exceeds a set value (for example, about 73 ° C.), and the control device 13 As described above, the hot water three-way valve 45 is switched to the OFF-side outlet 45C side. This state is maintained until the external pump 50 is operated, and the gas engine 30 is well cooled by the engine cooling water cooled by the radiator 46.
[0064]
From the above, according to the above embodiment, the following effects (1) and (2) are achieved.
[0065]
(1) The engine immediately after the gas engine 30 is cooled by adjusting the engine cooling water led to the radiator 46 and the circulation pump 47 by the hot water three-way valve 45 disposed downstream of the hot water heat exchanger 44 in the engine cooling device 41. Based on the temperature of the cooling water (temperature detected by the engine outlet temperature sensor 53) and the temperature of the engine cooling water immediately after heat exchange by the hot water heat exchanger 44 (temperature detected by the hot water heat exchanger outlet temperature sensor 52). Therefore, it is possible to prevent the engine cooling water cooled by heat exchange by the hot water heat exchanger 44 from being unnecessarily cooled by the radiator 46. As a result, the heat exchange efficiency of the hot water heat exchanger 44 can be improved, and high temperature hot water can be taken out by the hot water supply system 49. At the same time, since the temperature of the engine cooling water can be maintained so as not to hinder the cooling of the gas engine 30, the cooling of the gas engine 30 with the engine cooling water can be suitably performed.
[0066]
(2) When the temperature of the hot water taken out from the hot water supply system 49 is in the range of about 60 to 80 ° C., the temperature of the engine coolant immediately after the heat exchange in the hot water heat exchanger 44 is the heat water heat exchange from the hot water supply system 49. It changes most greatly when the temperature of the hot water flowing into the vessel 44 (about 60 ° C.) is changed, and there is little change even if the flow rate of the hot water flowing through the hot water supply system 49 fluctuates. Therefore, the hot water heat exchanger outlet temperature sensor 52 is installed downstream of the hot water heat exchanger 44 and upstream of the hot water three-way valve 45 in the cooling water pipe 42, and heat is exchanged by the hot water heat exchanger 44. Even if the flow rate of the hot water flowing through the hot water supply system 49 fluctuates in a wide range by detecting the temperature of the engine cooling water immediately after this and using this detected temperature for switching control of the hot water heat exchanger outlet temperature sensor 52. The temperature of the hot water taken out from the hot water supply system 49 can be controlled with high accuracy in the range of about 60 to 80 ° C.
[0067]
[B] Second embodiment
In this second embodiment, the hot water three-way valve 45 is not a switchable three-way valve, and the flow rate of the engine cooling water flowing into the inlet 45A is distributed to the ON side outlet 45B side and the OFF side outlet 45C side. It is a proportional three-way valve. This proportional hot water three-way valve 45 can guide part of the engine cooling water flowing into the inlet 45A from the OFF-side outlet 45C to the radiator 46, and guide the rest from the ON-side outlet 45B to the suction side of the circulation pump 47. Therefore, the cooling system bypass pipe 48 is unnecessary.
[0068]
The proportional hot water three-way valve 45 is driven by a motor, and the controller 13 controls the motor to set the opening degree of the ON side outlet 45B and the OFF side outlet 45C of the hot water three way valve 45.
[0069]
That is, when the engine coolant temperature detected by the engine outlet temperature sensor 53 is less than about 70 ° C., the control device 13 opens the ON-side outlet 45B of the hot water three-way valve 45 at an opening speed of 1% / sec. To increase the engine coolant temperature. When the engine coolant temperature detected by the engine outlet temperature sensor 53 is about 90 ° C. or higher, the control device 13 opens the OFF-side outlet 45C of the hot water three-way valve 45 at an opening speed of 5% / sec. Then, the engine coolant is cooled by the heat radiation of the radiator 46.
[0070]
When the engine coolant temperature detected by the engine outlet temperature sensor 53 is about 70 ° C. or higher and lower than about 90 ° C., and the engine coolant temperature detected by the hot water heat exchanger outlet temperature sensor 52 and the set value ( For example, the temperature difference from about 73 ° C. is 3 ° C. or more, that is,
(Set value)-(temperature detected by hot water heat exchanger outlet temperature sensor 52) ≥ 3 ° C
In this case, the control device 13 opens the ON-side outlet 45B of the hot water three-way valve 45 at an opening speed of 1% / sec, and suppresses the heat radiation of the engine cooling water by the radiator 46.
[0071]
Further, when the engine coolant temperature detected by the engine outlet temperature sensor 53 is about 70 ° C. or more and less than about 90 ° C., and the engine coolant temperature detected by the hot water heat exchanger outlet temperature sensor 52 is set. The temperature difference from the value (eg about 73 ° C.) is less than −3 ° C., ie
(Set value)-(temperature detected by hot water heat exchanger outlet temperature sensor 52) <-3 ° C
In this case, the control device 13 opens the OFF-side outlet 45C of the hot water three-way valve 45 at an opening speed of 1% / sec, and cools the engine coolant by the heat radiation of the radiator 46.
[0072]
Therefore, also in the second embodiment, detection of the engine coolant led by the hot water three-way valve 45 to the circulation pump 47 side and the radiator 46 side is detected by the hot water heat exchanger outlet temperature sensor 52 and the engine outlet temperature sensor 53. Since the adjustment is based on the temperature, the same effects as the effects (1) and (2) of the first embodiment can be obtained.
[0073]
As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.
[0074]
【The invention's effect】
According to the engine cooling method according to the first aspect of the present invention, the engine can be suitably cooled by the first medium, and the high-temperature second medium can be taken out by improving the heat exchange efficiency of the heat exchanger.
[0075]
 Claims5According to the engine cooling device according to the invention described above, the engine can be suitably cooled by the first medium, and the high-temperature second medium can be taken out by improving the heat exchange efficiency of the heat exchanger.
[0076]
 Further claims10According to the refrigeration apparatus according to the invention described above, the engine can be suitably cooled by the first medium flowing through the engine cooling device, and the heat exchange efficiency of the heat exchanger of the engine cooling device can be improved so that the high temperature second medium can be obtained. It can be taken out.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a refrigerant circuit of an air conditioner to which an embodiment of a refrigeration apparatus according to the present invention is applied.
FIG. 2 is a circuit diagram showing a refrigerant circuit of an air conditioner as a conventional refrigeration apparatus.
[Explanation of symbols]
10 Air conditioning equipment (refrigeration equipment)
13 Control device
16 Compressor
19 Outdoor heat exchanger
21A, 21B Indoor heat exchanger
22A, 22B Indoor expansion valve
24 Outdoor expansion valve
30 Gas engine
41 Engine cooling system
44 Hot water heat exchanger (heat exchanger)
45 Hot water three-way valve (three-way valve)
45A Hot water three-way valve entrance
45B ON side outlet of hot water three-way valve
45C OFF side outlet of hot water three-way valve
46 Radiator
47 Circulation pump
48 Cooling system bypass pipe
49 Hot water supply system
52 Hot water heat exchanger outlet temperature sensor
53 Engine outlet temperature sensor

Claims

Engine cooling in which a first medium for recovering exhaust heat of the engine is cooled and circulated by a heat exchanger and a radiator, cools the engine, and heat-exchanges the first medium with a second medium by the heat exchanger. In the method
The engine is cooled by a three-way valve that is arranged downstream of the heat exchanger and has an inlet connected to the heat exchanger and one outlet connected to the radiator side and the other outlet connected to the engine side . The temperature of the first medium immediately after the heat exchange with the heat exchanger, the temperature of the first medium immediately after the heat exchange with the heat exchanger, and the set temperature after the heat exchange of the second medium. An engine cooling method characterized in that the first medium led from the three-way valve to the radiator and the engine is adjusted based on a set value, and the flow rate of the first medium led to the radiator and the engine is distributed. .

The three-way valve is a switching three-way valve, and the temperature of the first medium immediately after cooling the engine, the temperature of the first medium immediately after heat exchange by the heat exchanger, and the heat of the second medium. Based on the set value of the first medium set based on the set temperature after replacement, the first medium that has flowed out of the heat exchanger is alternatively guided to the radiator and the engine, and the heat exchange The outlet side of the heat exchanger and the inlet side of the radiator are connected by a bypass pipe that guides a part of the first medium flowing out of the heater to the radiator without passing through the three-way valve. Item 4. The engine cooling method according to Item 1.

When the three-way valve is once switched so that the first medium is guided to the radiator, the first medium is guided to the engine unless the time corresponding to the set time of the delay timer has elapsed. The engine cooling method according to claim 1, wherein the three-way valve is not switched as described above.

It said first medium is engine cooling water, engine cooling method according to claim 1, wherein said second medium is hot water.

A first medium for recovering exhaust heat of the engine is cooled and circulated by a heat exchanger and a radiator to cool the engine, and the heat exchanger exchanges heat between the first medium and the second medium. In the engine cooling device configured,
A three-way valve disposed downstream of the heat exchanger, having an inlet connected to the heat exchanger side and one outlet connected to the radiator side and the other outlet connected to the engine side cooled the engine. The temperature of the first medium immediately after the heat exchange with the heat exchanger, the temperature of the first medium immediately after the heat exchange with the heat exchanger, and the set temperature after the heat exchange of the second medium. An engine cooling apparatus configured to adjust the first medium guided to the radiator and the engine based on a set value, and to distribute a flow rate of the first medium guided to the radiator and the engine .

The three-way valve is a switching three-way valve, and the temperature of the first medium immediately after cooling the engine, the temperature of the first medium immediately after heat exchange by the heat exchanger, and the heat exchange of the second medium The first medium that has flowed out of the heat exchanger is guided to the radiator and the engine based on the set value of the first medium that is set based on the set temperature of the heat exchanger, and from the heat exchanger claim a part of the leaked the first medium, characterized in that the inlet side of the outlet side and the radiator of the heat exchanger are connected by a bypass pipe leading to the radiator without passing through the three-way valve 5 The engine cooling device according to 1.

When the three-way valve is once switched so that the first medium is guided to the radiator, the first medium is guided to the engine unless the time corresponding to the set time of the delay timer has elapsed. The engine cooling apparatus according to claim 6, wherein the three-way valve is not switched as described above.

The three-way valve is a proportional three-way valve, the temperature of the first medium immediately after cooling the engine, the temperature of the first medium immediately after heat exchange by the heat exchanger, and the heat exchange of the second medium The flow rate of the first medium flowing out from the heat exchanger is distributed and guided to the radiator and the engine based on the set value of the first medium set based on the set temperature. Item 6. The engine cooling device according to Item 5 .

The engine cooling apparatus according to any one of claims 5 to 8 , wherein the first medium is engine cooling water, and the second medium is hot water.

A refrigerant circulates through a compressor, a condenser, an expansion mechanism, and an evaporator that are sequentially connected, and the compressor is driven by an engine and has an engine cooling device. The engine cooling device The first medium to be recovered is cooled and circulated by a heat exchanger and a radiator to cool the engine, and the heat exchanger is configured to exchange heat between the first medium and the second medium. In a refrigeration system,
The three-way valve, which is disposed downstream of the heat exchanger in the engine cooling device and has an inlet connected to the heat exchanger side and one outlet connected to the radiator side and the other outlet connected to the engine side , It is set based on the temperature of the first medium immediately after cooling the engine, the temperature of the first medium immediately after heat exchange by the heat exchanger, and the set temperature after heat exchange of the second medium. The first medium guided to the radiator and the engine is adjusted based on a set value of the first medium, and the flow rate of the first medium guided to the radiator and the engine is distributed. Refrigeration equipment.

The three-way valve in the engine cooling device is a switching type three-way valve, and the temperature of the first medium immediately after cooling the engine, the temperature of the first medium immediately after heat exchange by the heat exchanger , and the second medium of based on the set value of the first medium is set based on the set temperature after the heat exchange, while being configured to direct the alternative the first medium flowing out from the heat exchanger to the radiator and the engine, the The outlet side of the heat exchanger and the inlet side of the radiator are connected by a bypass pipe that guides a part of the first medium flowing out from the heat exchanger to the radiator without passing through the three-way valve. The refrigeration apparatus according to claim 10.

When the three-way valve is once switched so that the first medium is guided to the radiator, the first medium is guided to the engine unless the time corresponding to the set time of the delay timer has elapsed. The refrigeration apparatus according to claim 11, wherein the three-way valve is not switched as described above.

The three-way valve in the engine cooling device is a proportional three-way valve, and the temperature of the first medium immediately after cooling the engine, the temperature of the first medium immediately after heat exchange by the heat exchanger , and the second medium The flow rate of the first medium flowing out from the heat exchanger is distributed and guided to the radiator and the engine based on the set value of the first medium set based on the set temperature after the heat exchange of The refrigeration apparatus according to claim 10 , wherein

The refrigeration apparatus according to any one of claims 10 to 13 , wherein the first medium in the engine cooling apparatus is engine cooling water, and the second medium is hot water.