JP3696064B2

JP3696064B2 - refrigerator

Info

Publication number: JP3696064B2
Application number: JP2000254130A
Authority: JP
Inventors: 達哉尾崎; 勉佐久間; 稔天明
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 2000-08-24
Filing date: 2000-08-24
Publication date: 2005-09-14
Anticipated expiration: 2020-08-24
Also published as: JP2002071262A

Description

【０００１】
【発明の属する技術分野】
本発明は、冷蔵用蒸発器と冷凍用蒸発器を有する冷蔵庫に関するものである。
【０００２】
【従来の技術及び発明が解決しようとする課題】
最近、冷蔵室や野菜室などの冷蔵空間と冷凍室や製氷室などの冷凍空間とにそれぞれ専用の蒸発器を配して、両蒸発器によって冷蔵空間と冷凍空間をそれぞれの庫内温度に適した蒸発温度で冷却するようにした冷蔵庫がある。
【０００３】
冷蔵庫の冷凍サイクルは、一般に、圧縮機から吐出された冷媒を、凝縮器、キャピラリチューブ等の絞り機構、蒸発器を経て再び圧縮機に戻るように構成されており、上記のように冷蔵用蒸発器と冷凍用蒸発器とを備える場合、両者を直列に接続する場合と、並列に接続する場合がある。
【０００４】
図４は、冷蔵用蒸発器と冷凍用蒸発器とを並列に接続した冷凍サイクルの構成例を示す図である。圧縮機１から吐出された冷媒の流れる冷媒配管は凝縮器２に接続され、凝縮器２の出口側で２本に分岐されている。分岐された一方の冷媒配管には、冷凍用キャピラリチューブ（以下、Ｆキャピラリ）３と、その下流に冷凍用蒸発器（以下、Ｆエバ）４が接続され、他方の冷媒配管には、冷蔵用キャピラリチューブ（以下、Ｒキャピラリ）５と、その下流に冷蔵用蒸発器（以下、Ｒエバ）６が接続され、これにより、両キャピラリ３，５及び蒸発器４，６が互いに並列に接続されている。上記の分岐部には、流路切替手段である三方弁７が設けられており、該三方弁７により、Ｆエバ４側とＲエバ６側とに冷媒の流路が交互に切り替えられるよう構成されている。Ｆエバ４の出口側のパイプにはアキュムレータ８と逆止弁９が接続されており、その後、Ｆエバ４側の配管とＲエバ６側の配管とが合流されて、圧縮機１の吸い込み側につながっている。
【０００５】
この冷凍サイクルでは、三方弁７で冷媒流路を切り替えることによってＦエバ４とＲエバ６を交互に冷却するよう構成されており、Ｆエバ４とＲエバ６は、各キャピラリ３，５の作用によって、それぞれの庫内温度に適した蒸発温度で冷蔵空間と冷凍空間を冷却するようになっている。
【０００６】
そして、Ｆエバ４とＲエバ６を並列に接続した場合、除霜に際し、除霜する蒸発器内の冷媒を回収することによって該蒸発器内の冷媒量を減少させてから除霜を行うことができるので、蒸発器内に冷媒が溜まったままの状態で除霜せざるを得ない直列接続の場合に比べて、除霜効率を向上させることができる。
【０００７】
本発明は、このようにＦエバとＲエバとを並列に接続した冷凍サイクルを有する冷蔵庫において、Ｆエバ及びＲエバから圧縮機への戻りパイプの好適な配置構成を提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明の請求項１記載の冷蔵庫は、断熱箱体の内側に冷蔵温度帯の冷蔵空間と冷凍温度帯の冷凍空間とを備え、断熱箱体の外側に機械室を備える冷蔵庫であって、前記機械室に配された圧縮機と、凝縮器と、前記冷蔵空間を冷却する冷蔵用蒸発器と、前記冷凍空間を冷却する冷凍用蒸発器と有し、前記凝縮器の出口側に流路切替手段を介して前記冷蔵用蒸発器と前記冷凍用蒸発器とが並列に接続された冷凍サイクルを備える冷蔵庫において、前記冷蔵用蒸発器と前記冷凍用蒸発器とが、冷蔵用蒸発器が上方になるように上下に配置され、前記冷蔵用蒸発器の出口側に接続された冷蔵用サクションパイプと、前記冷凍用蒸発器の出口側に接続された冷凍用サクションパイプとが、前記断熱箱体の背面断熱壁中において、互いに熱交換しない略一定の間隔を保ちながら、幅方向一方側を上方に延び、該背面断熱壁の上部で幅方向一方側から他方側に至り、さらに当該他方側を下方に延びて、前記断熱箱体の底部背面側に設けられた前記機械室に引き出され、該機械室内で両者が合流し、合流した冷媒配管が前記圧縮機に接続されており、前記流路切替手段と前記冷蔵用蒸発器との間に接続された冷蔵用キャピラリチューブが、前記冷蔵用サクションパイプと熱交換できるように当該パイプに沿って配設され、前記流路切替手段と前記冷凍用蒸発器との間に接続された冷凍用キャピラリチューブが、前記冷凍用サクションパイプと熱交換できるように当該パイプに沿って配設され、前記背面断熱壁中を互いに略平行に延びる前記冷凍用サクションパイプと前記冷蔵用サクションパイプとが、前記冷凍用サクションパイプが外周側になるように配設されたものである。
【０００９】
この冷蔵庫では、並列に接続された冷蔵用蒸発器と冷凍用蒸発器とからそれぞれサクションパイプが引き出され、両サクションパイプは互いに熱交換することなく断熱壁中に配設され、機械室で合流して圧縮機に冷媒が戻るようになっている。このように両蒸発器にそれぞれ専用のサクションパイプを設けたことから、除霜時に、各蒸発器から圧縮機に冷媒を回収する時間を短くすることができる。また、両サクションパイプを機械室内で合流するようにしたことから、製造時における接続作業が容易であり、またメンテナンス性に優れる。
【００１０】
この場合、前記機械室内に出された前記冷凍用サクションパイプの前記合流前に逆止弁を設けることが好ましい。これにより、冷蔵用蒸発器内の冷媒が冷凍用サクションパイプを逆流して冷凍用蒸発器内に流入するのを防止することができる。
【００１２】
請求項１記載の冷蔵庫であると、また、上記のように冷蔵用サクションパイプと冷凍用サクションパイプとを、背面断熱壁の上部で折り返すように幅方向一方側から他方側に引き回して配設することにより、各キャピラリチューブとの間で熱交換するための十分な長さを確保することができる。また、両サクションパイプを背面断熱壁中に互いに略平行に走行させたことにより、両者間での熱的な相互作用を低減して、それぞれのキャピラリチューブとの間での熱交換を効率的に行うことができる。
【００１３】
また、前記背面断熱壁中を互いに略平行に延びる前記冷凍用サクションパイプと前記冷蔵用サクションパイプとを、前記冷凍用サクションパイプが外周側になるように配設したことにより、冷凍用サクションパイプの長さを、内周側に配置する場合に比べて長く確保できることから、冷蔵側よりも強い絞り効果が要求される冷凍用キャピラリチューブを長くして絞り効果を高めることができる。また、機械室内において冷凍用サクションパイプが冷蔵用サクションパイプよりも幅方向外側に位置するため、下流に接続する逆止弁の設置スペースを確保することができるとともに、逆止弁の溶接が容易である。また、前記冷蔵用蒸発器と前記冷凍蒸発器とを冷蔵用蒸発器が上方になるように上下に配置したので、両サクションパイプを交差させずに平行に配設することができる。
【００１４】
本発明の請求項２記載の冷蔵庫は、断熱箱体の内側に冷蔵温度帯の冷蔵空間と冷凍温度帯の冷凍空間とを備え、断熱箱体の外側に機械室を備える冷蔵庫であって、前記機械室に配された圧縮機と、凝縮器と、前記冷蔵空間を冷却する冷蔵用蒸発器と、前記冷凍空間を冷却する冷凍用蒸発器と有し、前記凝縮器の出口側に流路切替手段を介して前記冷蔵用蒸発器と前記冷凍用蒸発器とが並列に接続された冷凍サイクルを備える冷蔵庫において、前記冷蔵用蒸発器と前記冷凍用蒸発器とが上下に配置され、前記冷蔵用蒸発器の出口側に接続された冷蔵用サクションパイプと、前記冷凍用蒸発器の出口側に接続された冷凍用サクションパイプとが、前記断熱箱体の背面断熱壁中において、互いに熱交換しない略一定の間隔を保ちながら、幅方向一方側を上方に延び、該背面断熱壁の上部で幅方向一方側から他方側に至り、さらに当該他方側を下方に延びて、前記断熱箱体の底部背面側に設けられた前記機械室に引き出され、該機械室内で両者が合流し、合流した冷媒配管が前記圧縮機に接続されており、前記流路切替手段と前記冷蔵用蒸発器との間に接続された冷蔵用キャピラリチューブが、前記冷蔵用サクションパイプと熱交換できるように当該パイプに沿って配設され、前記流路切替手段と前記冷凍用蒸発器との間に接続された冷凍用キャピラリチューブが、前記冷凍用サクションパイプと熱交換できるように当該パイプに沿って配設され、前記背面断熱壁中を互いに略平行に延びる前記冷凍用サクションパイプと前記冷蔵用サクションパイプとが、前記冷蔵用サクションパイプが外周側になるように配設されたものである。この場合も、請求項１記載の冷蔵庫と同様、両蒸発器にそれぞれ専用のサクションパイプを設けたことから、除霜時に、各蒸発器から圧縮機に冷媒を回収する時間を短くすることができ、また、両サクションパイプを機械室内で合流するようにしたことから、製造時における接続作業が容易であり、またメンテナンス性に優れる。また、両サクションパイプを、背面断熱壁の上部で折り返すように引き回して配設したことにより、各キャピラリチューブとの間で熱交換するための十分な長さを確保することができ、また、両サクションパイプを背面断熱壁中に互いに略平行に走行させたことにより、両者間での熱的な相互作用を低減して、それぞれのキャピラリチューブとの間での熱交換を効率的に行うことができる。そして、特に、請求項２の冷蔵庫であると、冷蔵用サクションパイプが外周側になるように配設したことにより、冷蔵用サクションパイプの長さを、内周側に配置する場合に比べて長く確保できることから、冷凍側よりも絞りが緩く構成され、従って冷媒流量の多い冷蔵用キャピラリチューブと冷蔵用サクションパイプとの熱交換量を高めることができる。また、熱交換量が十分に確保できるため、冷蔵用蒸発器から液冷媒状態での戻りが発生しても、冷蔵用サクションパイプ出口では蒸発を完了させて液バックを防止することができる。さらに、冷凍用サクションパイプのコンパクト化が図られ、コスト低減及び組み込み時の取り扱い性を向上することができる。
【００１８】
本発明の冷蔵庫においては、請求項３記載のように、前記流路切替手段によって除霜する側の蒸発器への冷媒流路を閉じて、前記圧縮機を運転することにより当該蒸発器内の冷媒を圧縮機に回収し、冷媒回収後に前記圧縮機を停止して、該蒸発器の除霜を行うことが好ましい。
【００１９】
このように除霜する際に、冷媒回収により除霜する側の蒸発器内の冷媒量を減少させることにより、除霜効率を向上させて除霜時間を短縮することができるので、庫内温度変化を抑制して、食品への温度変化による悪影響を抑えることができる。また、除霜ヒータへの入力量を低減して省電力を図ることができる。
【００２０】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて説明する。
【００２１】
図１は本発明の第１の実施形態に係る冷蔵庫の冷凍サイクルの配管構成図であり、図２は同冷蔵庫の縦断面図である。この冷蔵庫は、上記した図４に示す冷凍サイクルを備えており、同じ要素には同じ番号を付して説明を省略する。
【００２２】
図２に示すように、この冷蔵庫は、内箱と外箱との間に断熱材を充填発泡してなる断熱箱体１０により構成されている。断熱箱体１０の内部は、断熱仕切壁１２により上下に区切られており、その上部が冷蔵室１４と野菜室１６とからなる冷蔵温度帯の冷蔵空間となっており、その下方が第１冷凍室１８と第２冷凍室２０とからなる冷凍温度帯の冷凍空間になっている。
【００２３】
野菜室１６の背面には、冷蔵空間を冷却するＲエバ６と、その冷気を冷蔵空間内に循環させるための冷蔵用冷却ファン２２が配されている。また、第１冷凍室１８と第２冷凍室２０の背面には、冷凍空間を冷却するＦエバ４と、その冷気を冷凍空間内に循環させるための冷凍用冷却ファン２６が配されている。このように、Ｆエバ４とＲエバ６は、Ｒエバ６が上方に位置するように、上下方向に配置されている。なお、Ｒエバ６及びＦエバ４の下方には、それぞれ除霜ヒータ２４，２８が配設されている。
【００２４】
断熱箱体１０の底部背面側には機械室３０が設けられ、この機械室３０の内部に圧縮機１が設けられている。
【００２５】
以下、この冷蔵庫における冷凍サイクルの配管構成について説明する。
【００２６】
図１に示すように、圧縮機１から吐出された冷媒は、機械室３０内に配されたデリベリパイプ３２を経て凝縮器２に流れ、そこで凝縮される。なお、凝縮器２は、断熱箱体１０の背面に配された放熱パイプ、断熱箱体１０の底面に配されたワイヤコンデンサ、断熱箱体１０の前面開口縁部に配された防露パイプなどで構成されている。凝縮器２から出た冷媒は、ドライヤ３４を経て、機械室３０内に配された三方弁７に至る。
【００２７】
三方弁７で分岐された一方側の冷媒配管は、Ｆキャピラリ３を通って冷凍空間内に引き込まれ、そこでＦエバ４に接続されており、さらにＦエバ４の出口側で冷凍空間内に配されたアキュムレータ８に接続され、その後、冷凍用サクションパイプ３６を通って機械室３０に引き出されている。
【００２８】
三方弁７で分岐された他方側の冷媒配管は、Ｒキャピラリ５を通って冷蔵空間内に引き込まれ、そこでＲエバ６に接続されており、さらにＲエバ６から引き出された冷蔵用サクションパイプ３８を通って機械室３０に引き出されている。
【００２９】
そして、この実施形態では、冷凍用サクションパイプ３６と冷蔵用サクションパイプ３８とを、互いに接触させないで、即ちそれぞれ独立させて、断熱箱体１０の背面断熱壁１１中に配設し、該断熱壁１１から機械室３０に引き出して、機械室３０内で両者を合流３９させ、合流した冷媒配管４０を圧縮機１の吸い込み側に接続している。
【００３０】
詳細には、両サクションパイプ３６，３８は、Ｆエバ４及びＲエバ６の幅方向における同じ側の端部（ここでは、紙面向かって左側の端部）から背面断熱壁１１中を上方に引き出されており、互いに熱交換しない程度の略一定の間隔を保ちながら、背面断熱壁１１の上部で幅方向一方側（左側）から他方側（右側）に引き回すようにして折り返され、断熱壁１１の当該他方側を下方に延びて、機械室３０に引き出されている。その際、両サクションパイプ３６，３８は、冷凍用サクションパイプ３６が外周側になるように配設されている。
【００３１】
Ｒキャピラリ５は、冷蔵用サクションパイプ３８と熱交換できるように背面断熱壁１１中を当該パイプ３８に沿って配設されており、また、Ｆキャピラリ３も、冷凍用サクションパイプ３６と熱交換できるように背面断熱壁１１中を当該パイプ３６に沿って配設されている。
【００３２】
機械室３０内に引き出された冷凍用サクションパイプ３６には、冷蔵用サクションパイプ３８との合流３９前において逆止弁９が接続されており、Ｒエバ６内の冷媒がＦエバ４に流入するのを防止している。
【００３３】
本実施形態の冷蔵庫において除霜する際には、三方弁７によって除霜する側の蒸発器４，６への冷媒流路を閉じて圧縮機１を運転することにより、除霜する側の蒸発器４，６内の冷媒を回収し、冷媒回収後に圧縮機１を停止して、除霜ヒータ２４，２８により該蒸発器４，６の除霜を行う。冷媒回収時間は、対応するサクションパイプ３６，３８の温度などに基づいて設定することができる。
【００３４】
このように除霜する際に、冷媒回収によって除霜する蒸発器４，６内の冷媒量を減少させることにより、除霜効率を向上させて除霜時間を短縮することができる。そのため、庫内温度変化を抑制して、食品への温度変化による悪影響を抑えることができる。また、除霜ヒータ２４，２８への入力量を低減して省電力を図ることができる。
【００３５】
以上説明した本実施形態の冷蔵庫であると、並列に接続したＦエバ４とＲエバ６にそれぞれ専用のサクションパイプ３６，３８を設けたことから、除霜時に各蒸発器４，６からの冷媒回収時間を短くすることができる。
【００３６】
また、両サクションパイプ３６，３８を背面断熱壁１１中に互いに略平行に走行させたことにより、両者間での熱的な相互作用を低減して、それぞれのキャピラリチューブ３，５との間での熱交換を効率的に行うことができる。
【００３７】
さらに、両サクションパイプ３６，３８を、背面断熱壁１１の上部で折り返すように幅方向一方側から他方側に引き回して配設したことにより、各キャピラリチューブ３，５との間で熱交換するための十分な長さを確保することができる。
【００３８】
また、両サクションパイプ３６，３８を、冷凍用サクションパイプ３６が外周側になるように配設したことから、冷凍用サクションパイプ３６の長さを、内周側に配置する場合に比べて長く確保でき、そのため、冷蔵側よりも強い絞り効果が要求されるＦキャピラリ３を長くして絞り効果を高めることができる。Ｆキャピラリ３の口径は目詰まりを考慮すると０．７ｍｍ程度が細径化の限界であり、絞り効果を高めるには長さによる調節が必要となることから、この構成は有利である。また、機械室１内において冷凍用サクションパイプ３６が冷蔵用サクションパイプ３８よりも外側に位置するため、逆止弁９の設置スペースを確保することができるとともに、逆止弁９の溶接が容易である。さらに、Ｆエバ４を下側に配置した本実施形態では、両サクションパイプ３６，３８を交差させずに平行に配設することができる。
【００３９】
また、両サクションパイプ３６，３８を機械室１内で合流３９するようにしたことから、製造時における接続作業が容易であり、またメンテナンス性に優れる。
【００４０】
さらに、両サクションパイプ３６，３８の合流３９前において、冷凍用サクションパイプ３６に逆止弁９を設けたことから、Ｆエバ４の冷媒回収時にＲエバ６内の冷媒が冷凍用サクションパイプ３６を逆流してＦエバ４に流入するのを防止することができる。
【００４１】
図３は、第２の実施形態に係る冷凍サイクルの配管構成図である。この実施形態では、背面断熱壁１１中を互いに略平行に延びる冷凍用サクションパイプ３６と冷蔵用サクションパイプ３８とを、冷蔵用サクションパイプ３８が外周側になるように配設した点が、上記第１の実施形態とは異なる。
【００４２】
この第２の実施形態では、冷蔵用サクションパイプ３８の長さを、内周側に配置する場合に比べて長く確保できることから、Ｒキャピラリ５と冷蔵用サクションパイプ３８との熱交換量を高めることができる。蒸発器の蒸発温度は、通常、Ｒエバ６が−１０℃程度、Ｆエバ４が−２５℃程度であるため、この温度を維持するために、Ｒキャピラリ５の絞りはＦキャピラリ３よりも緩く構成されている。例えば、Ｆキャピラリ３の口径０．７ｍｍに対してＲキャピラリ５の口径は１．１ｍｍである。そのため、冷蔵空間の冷却時における冷媒循環量は冷凍空間の冷却時よりも多い。このことから、Ｒキャピラリ５と冷蔵用サクションパイプ３８との熱交換量を高めることは望ましい。
【００４３】
また、このように熱交換量を十分に確保できるため、Ｒエバ６から液冷媒状態での戻りが発生しても、冷蔵用サクションパイプ３８出口では蒸発を完了させて液バックを防止することができる。これは、本実施形態のように、Ｒエバ６の出口側にアキュムレータを設けていない構成において特に有効である。
【００４４】
さらに、冷凍用サクションパイプ３６のコンパクト化が図られ、コスト低減及び組み込み時の取り扱い性を向上することができる。
【００５０】
【発明の効果】
本発明の冷蔵庫であると、並列に接続された冷蔵用蒸発器と冷凍用蒸発器にそれぞれ専用のサクションパイプを設けたことから、除霜時に、各蒸発器から圧縮機に冷媒を回収する時間を短くすることができる。また、両サクションパイプを機械室内で合流するようにしたことから、製造時における接続作業が容易であり、またメンテナンス性に優れる。
【図面の簡単な説明】
【図１】本発明の第１の実施形態にかかる冷蔵庫の冷凍サイクルの配管構成図である。
【図２】冷蔵庫の縦断面図である。
【図３】第２の実施形態にかかる冷凍サイクルの配管構成図である。
【図４】冷凍サイクルの説明図である。
【符号の説明】
１圧縮機
２凝縮器
３冷凍用キャピラリチューブ（Ｆキャピラリ）
４冷凍用蒸発器（Ｆエバ）
５冷蔵用キャピラリチューブ（Ｒキャピラリ）
７三方弁
９逆止弁
１０断熱箱体
３０機械室
３６冷凍用サクションパイプ
３８冷蔵用サクションパイプ
３９合流部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigerator having a refrigeration evaporator and a refrigeration evaporator.
[0002]
[Prior art and problems to be solved by the invention]
Recently, dedicated evaporators have been installed in refrigerated spaces such as refrigerated rooms and vegetable rooms and refrigerated spaces such as freezer rooms and ice making rooms, and both evaporators are suitable for the temperature in the refrigerator and refrigerated spaces. There is a refrigerator that is cooled at the evaporation temperature.
[0003]
The refrigeration cycle of a refrigerator is generally configured so that the refrigerant discharged from the compressor returns to the compressor again through a condensing mechanism such as a condenser and a capillary tube, and an evaporator. In the case of providing a refrigerator and a freezing evaporator, there are cases where both are connected in series and in parallel.
[0004]
FIG. 4 is a diagram illustrating a configuration example of a refrigeration cycle in which a refrigeration evaporator and a refrigeration evaporator are connected in parallel. The refrigerant piping through which the refrigerant discharged from the compressor 1 flows is connected to the condenser 2 and branched into two on the outlet side of the condenser 2. One of the branched refrigerant pipes is connected to a refrigeration capillary tube (hereinafter referred to as “F capillary”) 3 and a refrigeration evaporator (hereinafter referred to as “F EVA”) 4 downstream thereof. A capillary tube (hereinafter referred to as R capillary) 5 and a refrigeration evaporator (hereinafter referred to as R EVA) 6 are connected downstream thereof, whereby both capillaries 3 and 5 and evaporators 4 and 6 are connected in parallel to each other. Yes. The branch section is provided with a three-way valve 7 which is a flow path switching means, and the three-way valve 7 is configured to alternately switch the refrigerant flow path between the F-evaluation 4 side and the R-evaluation 6 side. Has been. An accumulator 8 and a check valve 9 are connected to the pipe on the outlet side of the F EVA 4, and then the pipe on the F EVA 4 side and the pipe on the R EVA 6 side are merged, and the suction side of the compressor 1 Connected to.
[0005]
In this refrigeration cycle, the F-evacuation 4 and the R-evacuation 6 are configured to be alternately cooled by switching the refrigerant flow path with the three-way valve 7. Thus, the refrigeration space and the freezing space are cooled at an evaporation temperature suitable for each internal temperature.
[0006]
Then, when F EVA 4 and R EVA 6 are connected in parallel, defrosting is performed after reducing the amount of refrigerant in the evaporator by collecting the refrigerant in the evaporator to be defrosted during defrosting. Therefore, the defrosting efficiency can be improved as compared with the case of serial connection in which the refrigerant must be defrosted while the refrigerant remains in the evaporator.
[0007]
An object of the present invention is to provide a preferred arrangement of return pipes from the F and R EVAs to the compressor in the refrigerator having the refrigeration cycle in which the F and R EVAs are connected in parallel as described above. .
[0008]
[Means for Solving the Problems]
The refrigerator according to claim 1 of the present invention is a refrigerator including a refrigeration space in a refrigeration temperature zone and a refrigeration space in a refrigeration temperature zone inside a heat insulation box, and a machine room outside the heat insulation box, A compressor disposed in the machine room, a condenser, a refrigeration evaporator for cooling the refrigeration space, and a refrigeration evaporator for cooling the refrigeration space, and switching the flow path to the outlet side of the condenser In a refrigerator having a refrigeration cycle in which the refrigeration evaporator and the refrigeration evaporator are connected in parallel through a means, the refrigeration evaporator and the refrigeration evaporator are arranged so that the refrigeration evaporator is upward. The refrigeration suction pipe connected to the outlet side of the refrigeration evaporator, and the refrigeration suction pipe connected to the outlet side of the refrigeration evaporator , In the back insulation wall, it is almost the same that does not exchange heat with each other. 1 side in the width direction, while maintaining the gap, and from the one side in the width direction to the other side at the upper part of the rear heat insulating wall, and further downward in the other side, the bottom rear side of the heat insulating box the drawn into the machine chamber provided, both merge at the machine room, joins the refrigerant pipe is connected to the compressor, connected between said flow switching means and the refrigerating evaporator The refrigeration capillary tube is disposed along the pipe so as to be able to exchange heat with the refrigeration suction pipe, and is connected between the flow path switching means and the refrigeration evaporator. However, the refrigeration suction pipe and the refrigeration suction pipe are arranged along the pipe so as to be able to exchange heat with the refrigeration suction pipe, and extend substantially parallel to each other in the rear heat insulating wall. The one in which refrigerating suction pipe is arranged so that the outer peripheral side.
[0009]
In this refrigerator, suction pipes are drawn out from a refrigeration evaporator and a refrigeration evaporator connected in parallel, and both suction pipes are arranged in a heat insulating wall without exchanging heat with each other, and merge in a machine room. The refrigerant returns to the compressor. As described above, since the dedicated suction pipes are provided in both evaporators, it is possible to shorten the time for collecting the refrigerant from each evaporator to the compressor at the time of defrosting. Further, since both the suction pipes are merged in the machine room, the connection work at the time of manufacture is easy, and the maintainability is excellent.
[0010]
In this case , it is preferable to provide a check valve before the merging of the refrigeration suction pipe that is put into the machine room. Thereby, it is possible to prevent the refrigerant in the refrigeration evaporator from flowing backward into the refrigeration suction pipe and flowing into the refrigeration evaporator.
[0012]
In the refrigerator according to claim 1 , the refrigeration suction pipe and the refrigeration suction pipe are routed from one side in the width direction to the other side so as to be folded back at the upper part of the rear heat insulating wall. Thus, a sufficient length for exchanging heat with each capillary tube can be ensured. In addition, by running both suction pipes almost parallel to each other in the back heat insulation wall, the thermal interaction between the two is reduced, and heat exchange with each capillary tube is efficiently performed. It can be carried out.
[0013]
Further, by the rear insulation wall in said refrigerating suction pipe extending substantially parallel to each other and said refrigerating suction pipe, the freezer suction pipe is arranged so that the outer peripheral side, the suction pipe for refrigerating This length can be secured longer than the case where it is arranged on the inner peripheral side, so that the squeezing effect can be enhanced by lengthening the freezing capillary tube that requires a stronger squeezing effect than the refrigeration side. In addition, since the refrigeration suction pipe is located outside the refrigeration suction pipe in the width direction in the machine room, it is possible to secure the installation space for the check valve connected downstream, and the check valve can be easily welded. is there. Also, since the refrigerating evaporator and the freezing evaporator and the refrigerating evaporator is arranged vertically so that the upper, can be arranged in parallel without intersecting both suction pipe.
[0014]
The refrigerator according to claim 2 of the present invention is a refrigerator including a refrigeration space in a refrigeration temperature zone and a refrigeration space in a refrigeration temperature zone inside a heat insulation box, and a machine room outside the heat insulation box, A compressor disposed in the machine room, a condenser, a refrigeration evaporator for cooling the refrigeration space, and a refrigeration evaporator for cooling the refrigeration space, and switching the flow path to the outlet side of the condenser In a refrigerator having a refrigeration cycle in which the refrigeration evaporator and the refrigeration evaporator are connected in parallel via a means, the refrigeration evaporator and the refrigeration evaporator are arranged vertically, and the refrigeration evaporator The refrigeration suction pipe connected to the outlet side of the evaporator and the refrigeration suction pipe connected to the outlet side of the refrigeration evaporator do not exchange heat with each other in the rear heat insulation wall of the heat insulation box. One side in the width direction while maintaining a certain distance And extends from one side in the width direction to the other side at the upper part of the rear heat insulating wall, and further extends downward in the other side, and is drawn out to the machine room provided on the bottom rear side of the heat insulating box. The refrigeration capillary tube connected between the flow path switching means and the refrigeration evaporator includes the refrigeration capillary tube connected to the compressor, and the joined refrigerant pipes are joined in the machine chamber. A refrigeration capillary tube disposed along the pipe so as to be able to exchange heat with the refrigeration suction pipe, and connected between the flow path switching means and the refrigeration evaporator, exchanges heat with the refrigeration suction pipe. disposed along the pipe to allow the rear insulation wall in said refrigerating suction pipe extending substantially parallel to each other and said refrigerating suction pipe, the refrigerating suction pipe outer In which is disposed so that the side. Also in this case, as in the refrigerator according to claim 1, since the dedicated suction pipes are provided in both evaporators, the time for collecting the refrigerant from each evaporator to the compressor can be shortened at the time of defrosting. In addition, since both the suction pipes are merged in the machine room, the connection work at the time of manufacture is easy and the maintainability is excellent. In addition, by arranging the suction pipes so as to be folded back at the upper part of the rear heat insulating wall, it is possible to secure a sufficient length for heat exchange with each capillary tube. By running the suction pipes almost parallel to each other in the back heat insulation wall, it is possible to reduce the thermal interaction between them and efficiently exchange heat with each capillary tube. it can. And in particular, in the refrigerator of claim 2, the refrigeration suction pipe is arranged on the outer peripheral side, so that the length of the refrigeration suction pipe is set on the inner peripheral side. Since it can be ensured for a long time, the throttle is configured to be looser than that on the freezing side, and therefore the amount of heat exchange between the refrigeration capillary tube and the refrigeration suction pipe having a large refrigerant flow rate can be increased. In addition, since a sufficient amount of heat exchange can be secured, even if a return in the liquid refrigerant state occurs from the refrigeration evaporator, evaporation at the outlet of the refrigeration suction pipe can be completed to prevent liquid back. Further, the refrigeration suction pipe can be made compact, and the cost can be reduced and the handling at the time of incorporation can be improved.
[0018]
In the refrigerator of the present invention, as described in claim 3 , the refrigerant flow path to the evaporator on the defrosting side is closed by the flow path switching means, and the compressor is operated to close the inside of the evaporator. It is preferable to collect the refrigerant in the compressor , stop the compressor after collecting the refrigerant, and defrost the evaporator.
[0019]
When defrosting in this way, by reducing the amount of refrigerant in the evaporator on the defrosting side by refrigerant recovery, the defrosting efficiency can be improved and the defrosting time can be shortened. The change can be suppressed and adverse effects due to temperature changes on the food can be suppressed. Moreover, the amount of input to the defrost heater can be reduced to save power.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
FIG. 1 is a piping configuration diagram of the refrigeration cycle of the refrigerator according to the first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the refrigerator. This refrigerator includes the refrigeration cycle shown in FIG. 4 described above, and the same elements are denoted by the same reference numerals and description thereof is omitted.
[0022]
As shown in FIG. 2, the refrigerator includes a heat insulating box 10 formed by filling and foaming a heat insulating material between an inner box and an outer box. The inside of the heat insulation box 10 is divided into upper and lower parts by a heat insulation partition wall 12, the upper part is a refrigeration space of a refrigeration temperature zone composed of a refrigeration room 14 and a vegetable room 16, and the lower part is a first refrigeration. The refrigeration space is a refrigeration temperature zone composed of the chamber 18 and the second freezing chamber 20.
[0023]
On the back surface of the vegetable compartment 16, there are disposed an R EVA 6 for cooling the refrigeration space and a refrigeration cooling fan 22 for circulating the cold air in the refrigeration space. In addition, on the back surfaces of the first freezer compartment 18 and the second freezer compartment 20, an F-evaporator 4 for cooling the freezing space and a freezing cooling fan 26 for circulating the cold air in the freezing space are arranged. Thus, the F EVA 4 and the R EVA 6 are arranged in the vertical direction so that the R EVA 6 is positioned above. Note that defrost heaters 24 and 28 are disposed below the R and F EVAs 6 and 4, respectively.
[0024]
A machine room 30 is provided on the bottom rear side of the heat insulation box 10, and the compressor 1 is provided inside the machine room 30.
[0025]
Hereinafter, the piping configuration of the refrigeration cycle in the refrigerator will be described.
[0026]
As shown in FIG. 1, the refrigerant discharged from the compressor 1 flows into the condenser 2 through a delivery pipe 32 disposed in the machine room 30 and is condensed there. The condenser 2 includes a heat radiating pipe disposed on the back surface of the heat insulating box 10, a wire capacitor disposed on the bottom surface of the heat insulating box 10, a dewproof pipe disposed on the front opening edge of the heat insulating box 10, and the like. It consists of The refrigerant discharged from the condenser 2 passes through the dryer 34 and reaches the three-way valve 7 disposed in the machine room 30.
[0027]
One side of the refrigerant pipe branched by the three-way valve 7 is drawn into the refrigeration space through the F capillary 3, where it is connected to the F evacuation 4 and further arranged in the refrigeration space on the outlet side of the F evacuation 4. The accumulator 8 is connected to the accumulator 8 and then pulled out to the machine room 30 through the freezing suction pipe 36.
[0028]
The refrigerant pipe on the other side branched by the three-way valve 7 is drawn into the refrigeration space through the R capillary 5, where it is connected to the R evacuation 6, and further, the refrigeration suction pipe 38 drawn from the R evacuation 6. The machine room 30 is drawn out.
[0029]
In this embodiment, the refrigeration suction pipe 36 and the refrigeration suction pipe 38 are disposed in the rear heat insulating wall 11 of the heat insulating box 10 without being in contact with each other, that is, independently of each other. 11 is drawn to the machine room 30 to join 39 in the machine room 30, and the joined refrigerant pipe 40 is connected to the suction side of the compressor 1.
[0030]
Specifically, both suction pipes 36 and 38 are drawn upward in the rear heat insulating wall 11 from the end portions on the same side in the width direction of the F EVA 4 and the R EVA 6 (here, the left end portion in the drawing). The heat insulating wall 11 is folded back so as to be routed from one side (left side) to the other side (right side) in the width direction at the upper part of the rear heat insulating wall 11 while maintaining a substantially constant interval so as not to exchange heat with each other. The other side extends downward and is drawn out to the machine room 30. At that time, the two suction pipes 36 and 38 are arranged such that the refrigeration suction pipe 36 is on the outer peripheral side.
[0031]
The R capillary 5 is arranged along the pipe 38 in the rear heat insulating wall 11 so as to exchange heat with the refrigeration suction pipe 38, and the F capillary 3 can also exchange heat with the refrigeration suction pipe 36. Thus, the back heat insulating wall 11 is disposed along the pipe 36.
[0032]
A check valve 9 is connected to the refrigeration suction pipe 36 drawn into the machine room 30 before the merging 39 with the refrigeration suction pipe 38, and the refrigerant in the R evaporator 6 flows into the F evaporator 4. Is preventing.
[0033]
When defrosting in the refrigerator of this embodiment, the refrigerant flow to the evaporators 4 and 6 on the defrosting side is closed by the three-way valve 7 and the compressor 1 is operated to evaporate on the defrosting side. The refrigerant in the evaporators 4 and 6 is collected, the compressor 1 is stopped after the refrigerant is collected, and the evaporators 4 and 6 are defrosted by the defrost heaters 24 and 28. The refrigerant recovery time can be set based on the temperature of the corresponding suction pipes 36 and 38 and the like.
[0034]
When defrosting is performed in this manner, the amount of refrigerant in the evaporators 4 and 6 to be defrosted by refrigerant recovery is reduced, so that the defrosting efficiency can be improved and the defrosting time can be shortened. Therefore, it is possible to suppress the temperature change in the cabinet and suppress the adverse effects due to the temperature change on the food. Further, the amount of input to the defrost heaters 24 and 28 can be reduced to save power.
[0035]
In the refrigerator according to the present embodiment described above, the dedicated suction pipes 36 and 38 are provided for the F and R EVAs 4 and 6 connected in parallel, respectively, so that the refrigerant from each of the evaporators 4 and 6 is defrosted. The collection time can be shortened.
[0036]
In addition, since both the suction pipes 36 and 38 run in the back heat insulating wall 11 substantially in parallel with each other, the thermal interaction between the two is reduced, and between the capillary tubes 3 and 5. The heat exchange can be performed efficiently.
[0037]
Further, since both the suction pipes 36 and 38 are arranged by being routed from one side in the width direction to the other side so as to be folded back at the upper part of the rear heat insulating wall 11, heat exchange is performed between the capillary tubes 3 and 5. A sufficient length of can be secured.
[0038]
In addition, since both the suction pipes 36 and 38 are disposed so that the refrigeration suction pipe 36 is located on the outer peripheral side, the length of the refrigeration suction pipe 36 is ensured to be longer than the case where it is disposed on the inner peripheral side. Therefore, it is possible to lengthen the F capillary 3 that requires a stronger squeezing effect than the refrigeration side, thereby enhancing the squeezing effect. In consideration of clogging, the diameter of the F capillary 3 is about 0.7 mm, which is the limit for reducing the diameter, and the adjustment by the length is necessary to enhance the throttling effect, so this configuration is advantageous. Further, since the refrigeration suction pipe 36 is positioned outside the refrigeration suction pipe 38 in the machine room 1, a space for installing the check valve 9 can be secured, and the check valve 9 can be easily welded. is there. Further, in the present embodiment in which the F EVA 4 is disposed on the lower side, both the suction pipes 36 and 38 can be disposed in parallel without intersecting.
[0039]
Further, since both the suction pipes 36 and 38 are merged 39 in the machine room 1, the connection work at the time of manufacture is easy and the maintainability is excellent.
[0040]
Further, since the check valve 9 is provided in the refrigeration suction pipe 36 before the junction 39 of both the suction pipes 36 and 38, the refrigerant in the R evaporator 6 causes the refrigeration suction pipe 36 to pass through when the refrigerant of the F EVA 4 is recovered. It is possible to prevent the reverse flow and the flow into the F EVA 4.
[0041]
FIG. 3 is a piping configuration diagram of the refrigeration cycle according to the second embodiment. In this embodiment, the refrigeration suction pipe 36 and the refrigeration suction pipe 38 that extend substantially parallel to each other in the back heat insulating wall 11 are arranged such that the refrigeration suction pipe 38 is on the outer peripheral side. Different from the first embodiment.
[0042]
In the second embodiment, since the length of the refrigeration suction pipe 38 can be secured longer than the case where it is arranged on the inner peripheral side, the amount of heat exchange between the R capillary 5 and the refrigeration suction pipe 38 is increased. Can do. The evaporation temperature of the evaporator is normally about −10 ° C. for the R EVA 6 and about −25 ° C. for the F EVA 4. In order to maintain this temperature, the restriction of the R capillary 5 is looser than that of the F capillary 3. It is configured. For example, the diameter of the R capillary 5 is 1.1 mm while the diameter of the F capillary 3 is 0.7 mm. Therefore, the amount of refrigerant circulating when cooling the refrigerated space is larger than when cooling the refrigerated space. For this reason, it is desirable to increase the amount of heat exchange between the R capillary 5 and the refrigeration suction pipe 38.
[0043]
In addition, since a sufficient amount of heat exchange can be ensured in this way, even if a return in the liquid refrigerant state occurs from the R evaporator 6, evaporation at the outlet of the refrigeration suction pipe 38 is completed to prevent liquid back. it can. This is particularly effective in a configuration in which an accumulator is not provided on the outlet side of the R EVA 6 as in this embodiment.
[0044]
Furthermore, the refrigeration suction pipe 36 can be made compact, and the cost can be reduced and the handleability during installation can be improved.
[0050]
【The invention's effect】
In the refrigerator of the present invention, the dedicated refrigeration evaporator and the refrigeration evaporator connected in parallel are provided with respective suction pipes, so that the time for collecting the refrigerant from each evaporator to the compressor at the time of defrosting Can be shortened. Further, since both the suction pipes are merged in the machine room, the connection work at the time of manufacture is easy, and the maintainability is excellent.
[Brief description of the drawings]
FIG. 1 is a piping configuration diagram of a refrigeration cycle of a refrigerator according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a refrigerator.
FIG. 3 is a piping configuration diagram of a refrigeration cycle according to a second embodiment.
FIG. 4 is an explanatory diagram of a refrigeration cycle.
[Explanation of symbols]
1 Compressor 2 Condenser 3 Refrigeration Capillary Tube (F Capillary)
4 Refrigerating evaporator (F EVA)
5 Capillary tube for refrigeration (R capillary)
7 Three-way valve 9 Check valve 10 Heat insulation box 30 Machine room 36 Suction pipe for refrigeration 38 Suction pipe for refrigeration 39 Merge section

Claims

A refrigerator having a refrigerated space in a refrigerated temperature zone and a refrigerated space in a refrigerated temperature zone inside the heat insulation box, and having a machine room outside the heat insulation box,
A compressor disposed in the machine room; a condenser; a refrigerating evaporator for cooling the refrigerating space; and a refrigerating evaporator for cooling the refrigerating space, and a flow path on an outlet side of the condenser In a refrigerator comprising a refrigeration cycle in which the refrigeration evaporator and the refrigeration evaporator are connected in parallel via a switching means,
The refrigeration evaporator and the refrigeration evaporator are arranged one above the other so that the refrigeration evaporator is upward,
The refrigeration suction pipe connected to the outlet side of the refrigeration evaporator and the refrigeration suction pipe connected to the outlet side of the refrigeration evaporator heat each other in the rear heat insulating wall of the heat insulation box. While maintaining a substantially constant interval not to be exchanged, the one side in the width direction extends upward, reaches from the one side in the width direction to the other side at the upper part of the rear heat insulating wall, and further extends downward in the other side. Is drawn out to the machine room provided on the bottom back side of the two, the two join together in the machine room, the joined refrigerant pipe is connected to the compressor ,
A refrigeration capillary tube connected between the flow path switching means and the refrigeration evaporator is disposed along the pipe so as to exchange heat with the refrigeration suction pipe,
A refrigeration capillary tube connected between the flow path switching means and the refrigeration evaporator is disposed along the pipe so as to exchange heat with the refrigeration suction pipe,
The refrigerator, wherein the refrigeration suction pipe and the refrigeration suction pipe extending substantially parallel to each other in the rear heat insulating wall are arranged so that the refrigeration suction pipe is located on an outer peripheral side .

A refrigerator having a refrigerated space in a refrigerated temperature zone and a refrigerated space in a refrigerated temperature zone inside the heat insulation box, and having a machine room outside the heat insulation box,
A compressor disposed in the machine room; a condenser; a refrigerating evaporator for cooling the refrigerating space; and a refrigerating evaporator for cooling the refrigerating space, and a flow path on an outlet side of the condenser In a refrigerator comprising a refrigeration cycle in which the refrigeration evaporator and the refrigeration evaporator are connected in parallel via a switching means,
The refrigeration evaporator and the refrigeration evaporator are arranged above and below,
The refrigeration suction pipe connected to the outlet side of the refrigeration evaporator and the refrigeration suction pipe connected to the outlet side of the refrigeration evaporator heat each other in the rear heat insulating wall of the heat insulation box. While maintaining a substantially constant interval not to be exchanged, the one side in the width direction extends upward, reaches from the one side in the width direction to the other side at the upper part of the rear heat insulating wall, and further extends downward in the other side. Is drawn out to the machine room provided on the bottom back side of the two, the two join together in the machine room, the joined refrigerant pipe is connected to the compressor,
A refrigeration capillary tube connected between the flow path switching means and the refrigeration evaporator is disposed along the pipe so as to exchange heat with the refrigeration suction pipe,
A refrigeration capillary tube connected between the flow path switching means and the refrigeration evaporator is disposed along the pipe so as to exchange heat with the refrigeration suction pipe,
Refrigerator said rear insulation wall the freezer suction pipe extending substantially parallel to each other in the said cold storage suction pipe, you wherein refrigerating suction pipe is arranged so that the outer peripheral side.

By closing the refrigerant flow path to the evaporator on the defrosting side by the flow path switching means and operating the compressor , the refrigerant in the evaporator is recovered in the compressor, and after the refrigerant recovery, the compressor is The refrigerator according to claim 1 or 2 , wherein the refrigerator is stopped to defrost the evaporator.