JP3875563B2

JP3875563B2 - refrigerator

Info

Publication number: JP3875563B2
Application number: JP2002010333A
Authority: JP
Inventors: 明裕野口; 隆司土井; 弘次鹿島
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 2002-01-18
Filing date: 2002-01-18
Publication date: 2007-01-31
Anticipated expiration: 2022-01-18
Also published as: JP2003207252A

Description

【０００１】
【発明の属する技術分野】
この発明は、冷蔵室あるいは野菜室の最適な庫内湿度が効率よく得られるようにした冷蔵庫に関する。
【０００２】
【従来の技術】
一般に近年の冷蔵庫にあっては、例えば、図５に示すように、冷蔵室１０１，野菜室１０３，第１，第２の冷凍室１０５とを有し、冷蔵室１０１と野菜室１０３は、専用の冷蔵室用蒸発器１０７で熱交換された冷気を冷蔵室用ファン１０９によって庫内へ吹き出すことで、所定の庫内温度が確保されるようになっている。冷凍室１０５は、専用の冷凍室用蒸発器１１１で熱交換された冷気を冷凍室用ファン１１３によって庫内へ吹き出すことで、所定の庫内温度が確保されるようになっている。
【０００３】
【発明が解決しようとする課題】
冷蔵室１０１と野菜室１０３は、庫内へ入れる食料品の関係上、特に、乾燥を嫌い、所定の湿度が求められる。
【０００４】
この場合、冷蔵室１０１及び野菜室１０３は、専用の冷蔵室用蒸発器１０７によって熱交換を行なうことができるため、庫内温度を低くする冷凍室１０５に何等影響されることなく蒸発温度を高く設定することが可能となり、高い湿度が得られるようになる。
【０００５】
しかしながら、冷蔵室用ファン１０９は、冷蔵室用蒸発器１０７の下流に位置する所から、空気は、冷蔵室用蒸発器１０７，冷蔵室用ファン１０９の順に通過するようになり、高湿の空気温度が冷蔵室用ファン１０９を通過する時に高くなる。その結果、図４からも明らかなように、縦軸に絶対湿度，横軸に温度をとった時に、相対湿度は温度上昇にともない下がるようになる。せっかく、専用の冷蔵室用蒸発器１０７を設けるようにしたにもかかわらず、庫内空気の相対湿度を効果的に上げられず、十分な庫内湿度が期待できないのが現状となっている。
【０００６】
そこで、この発明は、庫内へ吹出す吹き出し空気の相対湿度を効率よく高めることができるようにした冷蔵庫を提供することを目的としている。
【０００７】
【課題を解決するための手段】
前記目的を達成するために、この発明の請求項１にあっては、冷凍サイクルを構成する圧縮機，凝縮器，絞り装置，冷蔵室用蒸発器，冷凍室用蒸発器とを備え、冷蔵室用蒸発器及び冷凍室用蒸発器とによって熱交換された空気を、冷蔵室用ファン及び冷凍室用ファンによって各庫内へそれぞれ吹き出すようにした冷蔵庫において、前記冷蔵室用蒸発器，冷蔵室用ファンの順に通過した庫内吹き出し前の空気を冷却する第２の冷却手段を冷蔵室用ファンの下流側に配置すると共に庫内へ向けて空気を誘導する空気ダクトのダクト壁を兼ねる形状となっていることを特徴とする。
【０００８】
これにより、圧縮機から吐出された冷媒は、凝縮器，絞り装置，冷蔵室用蒸発器，冷凍室用蒸発器を通り、再び圧縮室に戻る冷凍サイクルを構成する。この運転時において冷凍室用蒸発器を通過した空気を冷凍室用ファンによって庫内へ吹き出し庫内の冷却を行なう。
【０００９】
また、冷蔵室用蒸発器を通過した空気を冷蔵室用ファンによって庫内へ吹き出し、庫内の冷却を行なう。この時、冷蔵室用蒸発器を通過した空気は、冷蔵室用ファンを通過する時に温められ空気温度が上昇し相対湿度が下がるようになるが、温度上昇した空気を、第２の冷却手段によって下げられることができる結果、吹出し空気の相対湿度を高めた状態で庫内へ吹き出すことが可能となり、所定の庫内湿度が確保される。しかも、空気ダクトのダクト壁を兼ねる形状によって空気ダクトのコンパクト化にともなう庫内スペースの拡大が図れる。
【００１０】
また、この発明の請求項２にあっては、圧縮機を、低圧から中間圧まで冷媒を加圧する第１段圧縮室と中間圧から高圧まで冷媒を加圧する第２段圧縮室とを備えた２段圧縮機とすることを特徴とする。
【００１１】
これにより、低圧側吸込口から吸込まれた低圧冷媒は第１段圧縮室で中間圧まで加圧され、中間圧吸込口から吸込まれた中間圧冷媒と合流・混合し、第２段圧縮室で高圧まで加圧される。高圧まで加圧された冷媒は高圧吐出口から吐出されることで、冷蔵室用蒸発器と冷凍室用蒸発器を異なる温度域の連続運転が行なえる。
【００１２】
このために、冷蔵室用蒸発器による冷却温度を必要以上に下げる必要がなくなり、着霜量を減らして冷蔵室内の湿度を高く保つことが可能となる。
【００１７】
また、この発明の請求項３にあっては、第２の冷却手段を、伝熱板に冷媒が流れる冷媒管を設けたパイプオンシート熱交換器又は伝熱板同志を重ね合せその内部に冷媒が流れる冷媒流路を形成するロールボンド熱交換器とすることを特徴とする。
【００１８】
これにより、伝熱板を介して効率のよい熱交換が行なえるようになると共に、大きな占有スペースを有することなく第２の冷却手段の配置が可能となる。
【００１９】
【発明の実施の形態】
以下、図１乃至図３の図面を参照しながらこの発明の実施の形態について具体的に説明する。
【００２０】
図１は冷蔵庫３の概要切断面図を示しており、上方から冷蔵室５，野菜室７，第１，第２の冷凍室９となっている。
【００２１】
冷蔵室５は、前面が開閉扉１１となっていて、開閉扉１１の開閉により食料品等の出し入れが可能となっている。野菜室７及び第１，第２の冷凍室９は、引出し式の扉１３，１５を引き出すことで食料品等の出し入れが可能となっている。
【００２２】
冷蔵室５及び野菜室７の庫内は専用の冷蔵室用蒸発器１７によって、第１，第２の冷凍室９の庫内は専用の冷凍室用蒸発器１９によって、それぞれ冷却されるようになっている。
【００２３】
冷蔵室用蒸発器１７は、冷媒が流れる冷媒管とフィンとで構成され、野菜室７の背面後部に設けられている。野菜室７の背面後部は、冷蔵室用蒸発器１７を通過した空気が冷蔵室５，野菜室７の各庫内を通過した後、再び冷蔵室用蒸発器１７に戻る循環路２１となっている。循環路２１は、冷蔵室５の背面後部にわたって設けられた空気ダクト２３によって構成される一方、冷蔵室用蒸発器１７の下流には、空気循環用の冷蔵室用ファン２５が配置されている。
【００２４】
空気ダクト２３は、庫内へ冷気を吹き出す複数の吹出口２７を有すると共に、ダクト壁の一部は第２の冷却手段３１となる伝熱板３３によって形成されている。
【００２５】
第２の冷却手段３１は、金属でできた前記伝熱板３３と伝熱板３３のほぼ全領域にわたって配索され、冷媒が流れる冷媒管３５とから成るパイプオンシート熱交換器となっている。パイプオンシート熱交換器の伝熱板３３は、接触しながら流れる空気を含めて周囲の雰囲気を冷却する冷却壁面として機能するようになっている。
【００２６】
この場合、第２の冷却手段３１はパイプオンシート熱交換器に特定されない。例えば、図３に示すように伝熱板３３，３７同志を矢印方向から重ね合せ、その内部に冷媒が流れる連続した冷媒流路３９を形成するロールボンド熱交換器とする手段であってもよい。
【００２７】
一方、冷凍室用蒸発器１９は、冷媒が流れる冷媒管とフィンとで構成され、第１，第２の冷凍室９の背面後部に設けられている。第１，第２の冷凍室９の背面後部は、第１，第２の冷凍室９の各庫内を通過した空気が再び冷凍室用蒸発器１９を通過する循環路４１となっており、冷凍室用蒸発器１９の下流側には庫内へ空気を吹き出すための冷凍室用ファン４３が配置されている。
【００２８】
図２は、前記した冷蔵室用蒸発器１７，冷凍室用蒸発器１９，第２の冷却手段３１とを有する冷媒回路を示している。
【００２９】
冷媒には、地球温暖化防止に貢献するＲ６００ａのような炭化水素系冷媒が使用されており、冷媒回路は前記冷蔵室用蒸発器１７，冷凍室用蒸発器１９，第２の冷却手段３１の外に、圧縮機５１，凝縮器５３，気液分離器５５とを備えている。圧縮機５１は、２段圧縮タイプとなっている。
【００３０】
即ち、圧縮機５１は、低圧側吸込口５１ａ，中間圧側吸込口５１ｂ，高圧側吐出口５１ｃを有し、さらに、低圧から中間圧まで冷媒を加圧する第１段圧縮室５７と、中間圧から高圧まで冷媒を加圧する第２段圧縮室５９とを備えた構造となっている。
【００３１】
したがって、圧縮機５１の高圧側吐出口５１ｃから吐出された高圧のガス冷媒は、凝縮器５３，絞り装置となる冷蔵室側キャピラリー６１，第２の冷却手段３１，冷蔵室用蒸発器１７を通り、気液分離器５５に入る。気液分離器５５においてガス冷媒と液冷媒に分離された一方のガス冷媒は、前記冷蔵室側キャピラリー６１と一部領域が並設し合う冷蔵室側サクションパイプ６３を介して再び圧縮機５１の中間圧側吸込口５１ｂへ戻る冷凍サイクルを構成するようになる。
【００３２】
冷蔵室側キャピラリー６１と冷蔵室側サクションパイプ６３が並設し合う一部領域（点線で示す）は、冷蔵室側キャピラリー６１とサクションパイプ６３との間で熱交換が行なわれる熱交換領域となっている。
【００３３】
一方、気液分離器５５において分離された他方の液冷媒は、前記冷凍室側キャピラリー６５と一部領域が並設し合う冷凍室側サクションパイプ６７を介して再び圧縮機５１の低圧側吸込口５１ａへ戻る冷凍サイクルを構成するようになる。
【００３４】
冷凍室側キャピラリー６５と冷凍室側サクションパイプ６７が並設し合う一部領域（点線で示す）は、冷凍室側キャピラリー６５とサクションパイプ６７との間で熱交換が行なわれる熱交換領域となっている。
【００３５】
このように構成された冷蔵庫によれば、圧縮機５１から吐出された冷媒は、凝縮器５３，第２の冷却手段３１，冷蔵室用蒸発器１７を通過した後、気液分離器５５に入る。気液分離器５５で分離されたガス冷媒と液冷媒の内、一方のガス冷媒は圧縮機５１の中間圧側吸込口５１ｂへ、他方の液冷媒は圧縮機５１の低圧側吸込口５１ａへそれぞれ戻るようになる。
【００３６】
圧縮機５１の低圧側吸込口５１ａからの低圧冷媒は、第１段圧縮室５７で中間圧まで加圧され、中間圧側吸込口５１ｂからの中間圧冷媒と合流、混合し第２段圧縮室５９で高圧まで加圧され高圧側吐出口５１ｃから吐出されることで、温度域の異なる冷蔵室用蒸発器１７を通る冷蔵室用冷凍サイクルと冷凍室用蒸発器１９を通る冷凍室用冷凍サイクルがそれぞれ得られる。
【００３７】
この場合、冷蔵室用冷凍サイクルにおいて、冷蔵室用蒸発器１７の温度を必要以上に下げることなく、食品保存に最適な温度域での連続運転が行なえるようになる。この連続運転時、冷蔵室用蒸発器１７で熱交換された空気は、冷蔵室用ファン２５を通過し、吹出口２７から冷蔵室５の庫内へ吹出される。
【００３８】
この場合、冷蔵室用ファン２５を通過した吹出し前の空気温度は温められ上昇するようになるが、第２の冷却手段３１によって冷却されるようになるため、吹出し空気の相対湿度を高めた状態で庫内へ吹き出すことが可能となり、所定の庫内湿度が確実に確保されるようになる。
【００３９】
【発明の効果】
以上、説明したように、この発明の請求項１によれば、冷蔵室用ファンを通過した時に温度上昇にともなう相対湿度が下がった庫内吹き出し前の空気を、第２の冷却手段によって温度を下げることで相対湿度を上昇させることができる。この結果、相対湿度を高めた庫内吹き出し前の空気を庫内へ向けて吹き出すことが可能となり、最適な庫内湿度を確実に確保することができる。しかも、第２の冷却手段は庫内へ空気を誘導する空気ダクトのダクト壁を兼ねる形状となるため、効率のよい熱交換が可能になると共に、空気ダクトのコンパクト化にともなう庫内スペースの拡大が図れるようになる。
【００４０】
また、この発明の請求項２によれば、２段圧縮機によって冷蔵室用蒸発器と冷凍室用蒸発器とを異なる温度域の連続運転が可能となり、冷蔵室用蒸発器における冷却温度を必要以上に下げることがなくなる結果、着霜量を減らし、庫内湿度を高く保てるようになる。
【００４３】
また、この発明の請求項３によれば、伝熱板を介して効率のよい熱交換が行なえると共に、大きな占有スペースを有することなく第２の冷却手段の配置ができる。
【図面の簡単な説明】
【図１】この発明にかかる冷蔵庫の概要切断説明図。
【図２】冷蔵庫の冷媒回路図。
【図３】温度と相対湿度の関係を示した説明図。
【図４】第２の冷却手段となるロールボンド熱交換器を示した一部分の概要説明図。
【図５】従来の冷蔵庫を示した概要切断説明図。
【符号の説明】
１７冷蔵室用蒸発器
１９冷凍室用蒸発器
２３空気ダクト
２５冷蔵室用ファン
３１第２の冷却手段
３３伝熱板
３５冷媒管
４３冷凍室用ファン
５１圧縮機
５３凝縮器
５７第１段圧縮室
５９第２段圧縮室[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigerator in which the optimum humidity in a refrigerator room or vegetable room can be obtained efficiently.
[0002]
[Prior art]
In general, in recent refrigerators, for example, as shown in FIG. 5, the refrigerator 101 has a refrigerator room 101, a vegetable room 103, and first and second freezing rooms 105. The refrigerator room 101 and the vegetable room 103 are dedicated. A predetermined internal temperature is ensured by blowing out the cold air exchanged by the cold room evaporator 107 to the inside by the cold room fan 109. The freezer compartment 105 is configured to ensure a predetermined internal temperature by blowing out the cold air heat-exchanged by the exclusive freezer evaporator 111 into the internal compartment using the freezer compartment fan 113.
[0003]
[Problems to be solved by the invention]
The refrigerator compartment 101 and the vegetable compartment 103 are particularly disliked from drying because of the foodstuffs to be put into the cabinet, and a predetermined humidity is required.
[0004]
In this case, since the refrigerator compartment 101 and the vegetable compartment 103 can perform heat exchange by the dedicated refrigerator compartment evaporator 107, the evaporation temperature is increased without being affected by the freezer compartment 105 that lowers the internal temperature. It becomes possible to set and high humidity can be obtained.
[0005]
However, since the refrigerating room fan 109 is located downstream of the refrigerating room evaporator 107, the air passes through the refrigerating room evaporator 107 and the refrigerating room fan 109 in this order, and the high humidity air The temperature rises when passing through the refrigerator compartment fan 109. As a result, as is apparent from FIG. 4, when the vertical axis represents absolute humidity and the horizontal axis represents temperature, the relative humidity decreases with increasing temperature. In spite of the fact that a dedicated refrigerator compartment evaporator 107 is provided, the relative humidity of the internal air cannot be increased effectively, and a sufficient internal humidity cannot be expected.
[0006]
Then, this invention aims at providing the refrigerator which enabled it to raise the relative humidity of the blowing air which blows off in the store | warehouse | chamber efficiently.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to claim 1 of the present invention, a compressor, a condenser, a throttling device, an evaporator for a refrigerator compartment, and an evaporator for a refrigerator compartment constituting a refrigeration cycle are provided. In the refrigerator in which the heat exchanged by the evaporator for the refrigerator and the evaporator for the freezer compartment is blown out into the respective compartments by the fan for the refrigerator compartment and the fan for the freezer compartment, the evaporator for the refrigerator compartment, for the refrigerator compartment The second cooling means for cooling the air before the blowout in the cabinet that has passed in the order of the fans is arranged on the downstream side of the refrigeration room fan and also serves as a duct wall of an air duct that guides the air toward the inside of the cabinet. It is characterized by .
[0008]
Thereby, the refrigerant discharged from the compressor constitutes a refrigeration cycle that passes through the condenser, the expansion device, the refrigerator for the refrigerator compartment, and the evaporator for the freezer compartment and returns to the compressor chamber again. During this operation, air that has passed through the freezer evaporator is blown out into the cabinet by the freezer fan to cool the inside of the cabinet.
[0009]
Moreover, the air which passed the evaporator for refrigerator compartments is blown out in the store | warehouse | chamber by the fan for refrigerator compartments, and the inside of a store | warehouse | chamber is cooled. At this time, the air passing through the refrigerating compartment evaporator is air temperature warmed as it passes through the fan refrigerating compartment becomes elevated relative humidity decreases, the temperature increase air, by the second cooling means As a result of being able to be lowered, it becomes possible to blow out into the warehouse in a state where the relative humidity of the blown air is increased, and a predetermined humidity in the warehouse is ensured . In addition, the space that accompanies the downsizing of the air duct can be expanded due to the shape that also serves as the duct wall of the air duct .
[0010]
According to a second aspect of the present invention, the compressor includes a first stage compression chamber that pressurizes the refrigerant from a low pressure to an intermediate pressure, and a second stage compression chamber that pressurizes the refrigerant from the intermediate pressure to the high pressure. A two-stage compressor is used.
[0011]
As a result, the low-pressure refrigerant sucked from the low-pressure side suction port is pressurized to the intermediate pressure in the first-stage compression chamber, and merged and mixed with the intermediate-pressure refrigerant sucked from the intermediate-pressure suction port. Pressurized to high pressure. The refrigerant pressurized to a high pressure is discharged from the high-pressure discharge port, whereby the refrigerator for the refrigerator compartment and the evaporator for the freezer compartment can be operated continuously in different temperature ranges.
[0012]
For this reason, it becomes unnecessary to lower the cooling temperature by the evaporator for refrigerator compartments more than necessary, and it becomes possible to reduce the amount of frost formation and to keep the humidity in the refrigerator compartment high.
[0017]
According to a third aspect of the present invention, the second cooling means is a pipe-on-sheet heat exchanger or a heat transfer plate provided with a refrigerant tube through which the refrigerant flows on the heat transfer plate. It is characterized by setting it as the roll bond heat exchanger which forms the refrigerant | coolant channel which flows.
[0018]
Thus, efficient heat exchange can be performed via the heat transfer plate, and the second cooling means can be arranged without having a large occupied space.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to FIGS. 1 to 3.
[0020]
FIG. 1: has shown the general | schematic cut surface figure of the refrigerator 3, and becomes the refrigerator compartment 5, the vegetable compartment 7, and the 1st, 2nd freezer compartment 9 from the upper direction.
[0021]
The front of the refrigerator compartment 5 is an open / close door 11, and food items and the like can be taken in and out by opening and closing the open / close door 11. In the vegetable compartment 7 and the first and second freezing compartments 9, food items and the like can be taken in and out by pulling out the drawer type doors 13 and 15.
[0022]
The refrigerator compartment 5 and the vegetable compartment 7 are cooled by a dedicated refrigerator compartment evaporator 17, and the first and second freezer compartments 9 are cooled by a dedicated refrigerator compartment evaporator 19. It has become.
[0023]
The refrigerating room evaporator 17 is composed of a refrigerant pipe and fins through which refrigerant flows, and is provided at the rear rear portion of the vegetable room 7. The rear rear portion of the vegetable compartment 7 becomes a circulation path 21 that returns to the refrigerator compartment evaporator 17 after the air that has passed through the refrigerator compartment evaporator 17 passes through the respective compartments of the refrigerator compartment 5 and the vegetable compartment 7. Yes. The circulation path 21 is constituted by an air duct 23 provided over the rear rear portion of the refrigerating room 5, while a refrigerating room fan 25 for air circulation is disposed downstream of the refrigerating room evaporator 17.
[0024]
The air duct 23 has a plurality of air outlets 27 for blowing cold air into the interior, and a part of the duct wall is formed by a heat transfer plate 33 serving as the second cooling means 31.
[0025]
The second cooling means 31 is a pipe-on-sheet heat exchanger comprising a heat transfer plate 33 made of metal and a refrigerant pipe 35 in which the refrigerant flows through almost the entire area of the heat transfer plate 33. . The heat transfer plate 33 of the pipe-on-sheet heat exchanger functions as a cooling wall surface that cools the surrounding atmosphere including the air that flows while contacting.
[0026]
In this case, the second cooling means 31 is not specified as a pipe-on-sheet heat exchanger. For example, as shown in FIG. 3, the heat transfer plates 33 and 37 may be superposed in the direction of the arrow, and a roll bond heat exchanger that forms a continuous refrigerant flow path 39 in which the refrigerant flows therein may be used. .
[0027]
On the other hand, the freezer compartment evaporator 19 is composed of a refrigerant pipe and fins through which refrigerant flows, and is provided at the rear rear portions of the first and second freezer compartments 9. The rear rear portions of the first and second freezer compartments 9 are circulation paths 41 through which the air that has passed through the respective compartments of the first and second freezer compartments 9 passes through the freezer compartment evaporator 19 again. A freezer compartment fan 43 for blowing air into the refrigerator is disposed on the downstream side of the freezer compartment evaporator 19.
[0028]
FIG. 2 shows a refrigerant circuit having the refrigerator compartment evaporator 17, the freezer compartment evaporator 19, and the second cooling means 31.
[0029]
As the refrigerant, a hydrocarbon-based refrigerant such as R600a that contributes to prevention of global warming is used, and the refrigerant circuit includes the evaporator 17 for the refrigerator compartment, the evaporator 19 for the freezer compartment, and the second cooling means 31. In addition, a compressor 51, a condenser 53, and a gas-liquid separator 55 are provided. The compressor 51 is a two-stage compression type.
[0030]
That is, the compressor 51 has a low pressure side suction port 51a, an intermediate pressure side suction port 51b, and a high pressure side discharge port 51c, and further includes a first stage compression chamber 57 that pressurizes the refrigerant from a low pressure to an intermediate pressure, and an intermediate pressure. The second stage compression chamber 59 for pressurizing the refrigerant to a high pressure is provided.
[0031]
Accordingly, the high-pressure gas refrigerant discharged from the high-pressure side discharge port 51c of the compressor 51 passes through the condenser 53, the refrigerating chamber side capillary 61 serving as the expansion device, the second cooling means 31, and the refrigerating chamber evaporator 17. And enters the gas-liquid separator 55. One gas refrigerant separated into the gas refrigerant and the liquid refrigerant in the gas-liquid separator 55 passes through the refrigerating chamber side suction pipe 63 in which a partial region is juxtaposed with the refrigerating chamber side capillary 61 again. A refrigeration cycle returning to the intermediate pressure side suction port 51b is configured.
[0032]
A partial region (indicated by a dotted line) where the refrigerator compartment side capillary 61 and the refrigerator compartment side suction pipe 63 are arranged side by side is a heat exchange region where heat exchange is performed between the refrigerator compartment side capillary 61 and the suction pipe 63. ing.
[0033]
On the other hand, the other liquid refrigerant separated in the gas-liquid separator 55 passes through the freezer compartment side suction pipe 67 in which a part of the freezer compartment capillary 65 is arranged side by side again, and the low pressure side suction port of the compressor 51 again. The refrigeration cycle is returned to 51a.
[0034]
A partial region (indicated by a dotted line) where the freezer compartment capillary 65 and the freezer compartment suction pipe 67 are arranged side by side is a heat exchange region in which heat exchange is performed between the freezer compartment capillary 65 and the suction pipe 67. ing.
[0035]
According to the refrigerator configured as described above, the refrigerant discharged from the compressor 51 passes through the condenser 53, the second cooling means 31, and the refrigerator 17 for the refrigerator compartment, and then enters the gas-liquid separator 55. . Of the gas refrigerant and liquid refrigerant separated by the gas-liquid separator 55, one gas refrigerant returns to the intermediate pressure side suction port 51b of the compressor 51, and the other liquid refrigerant returns to the low pressure side suction port 51a of the compressor 51. It becomes like this.
[0036]
The low-pressure refrigerant from the low-pressure side suction port 51a of the compressor 51 is pressurized to the intermediate pressure in the first-stage compression chamber 57, and merges and mixes with the intermediate-pressure refrigerant from the intermediate-pressure side suction port 51b. The refrigeration chamber refrigeration cycle passing through the refrigeration chamber evaporator 17 and the refrigeration chamber refrigeration cycle passing through the freezer compartment evaporator 19 having different temperature ranges are obtained by being pressurized to a high pressure and discharged from the high pressure side outlet 51c. Each is obtained.
[0037]
In this case, in the refrigerating room refrigerating cycle, continuous operation in a temperature range optimum for food preservation can be performed without lowering the temperature of the refrigerating room evaporator 17 more than necessary. During this continuous operation, the air exchanged by the refrigerator compartment evaporator 17 passes through the refrigerator compartment fan 25 and is blown out from the outlet 27 into the refrigerator compartment 5.
[0038]
In this case, the air temperature before blowing after passing through the refrigerator fan 25 is warmed and rises, but since it is cooled by the second cooling means 31, the relative humidity of the blowing air is increased. Thus, it is possible to blow out into the cabinet, and a predetermined humidity inside the cabinet is surely secured.
[0039]
【The invention's effect】
As described above, according to the first aspect of the present invention, a storage room balloon before air drops relative humidity with increasing temperature when passing through the fan refrigerating chamber, temperature by the second cooling means The relative humidity can be increased by lowering . As a result, it is possible to blow out the air before blowing into the cabinet with the increased relative humidity toward the inside of the cabinet, and it is possible to ensure the optimum inside humidity. Moreover, since the second cooling means also has a shape that doubles as the duct wall of the air duct that guides air into the warehouse, efficient heat exchange is possible, and the space in the warehouse is increased as the air duct becomes more compact. Can be planned .
[0040]
According to the second aspect of the present invention, the two-stage compressor allows the refrigerator for the refrigerator compartment and the evaporator for the refrigerator compartment to be continuously operated in different temperature ranges, and the cooling temperature in the evaporator for the refrigerator compartment is necessary. As a result, the amount of frost formation can be reduced and the internal humidity can be kept high.
[0043]
According to claim 3 of the present invention, efficient heat exchange can be performed via the heat transfer plate, and the second cooling means can be arranged without having a large occupied space.
[Brief description of the drawings]
FIG. 1 is a schematic cut explanatory view of a refrigerator according to the present invention.
FIG. 2 is a refrigerant circuit diagram of a refrigerator.
FIG. 3 is an explanatory diagram showing the relationship between temperature and relative humidity.
FIG. 4 is a partial schematic explanatory view showing a roll bond heat exchanger serving as a second cooling means.
FIG. 5 is a schematic cut explanatory view showing a conventional refrigerator.
[Explanation of symbols]
17 Refrigerating Room Evaporator 19 Freezing Room Evaporator 23 Air Duct 25 Refrigerating Room Fan 31 Second Cooling Unit 33 Heat Transfer Plate 35 Refrigerant Tube 43 Freezing Room Fan 51 Compressor 53 Condenser 57 First Stage Compression Chamber 59 Second stage compression chamber

Claims

冷凍サイクルを構成する圧縮機，凝縮器，絞り装置，冷蔵室用蒸発器，冷凍室用蒸発器とを備え、冷蔵室用蒸発器及び冷凍室用蒸発器とによって熱交換された空気を、冷蔵室用ファン及び冷凍室用ファンによって各庫内へそれぞれ吹き出すようにした冷蔵庫において、
前記冷蔵室用蒸発器，冷蔵室用ファンの順に通過した庫内吹き出し前の空気を冷却する第２の冷却手段を冷蔵室用ファンの下流側に配置すると共に庫内へ向けて空気を誘導する空気ダクトのダクト壁を兼ねる形状となっていることを特徴とする冷蔵庫。Compressor, condenser, expansion device, refrigeration room evaporator, and freezer room evaporator that constitute the refrigeration cycle. Air that has been heat-exchanged by the refrigeration room evaporator and freezer room evaporator is refrigerated. In the refrigerator that is blown out into the respective compartments by the room fan and the freezer fan,
A second cooling means for cooling the air before blowing in the refrigerator that has passed through the refrigerator for the refrigerator compartment and the fan for the refrigerator compartment is arranged on the downstream side of the fan for the refrigerator compartment, and the air is guided toward the interior of the refrigerator. A refrigerator having a shape also serving as a duct wall of an air duct .

圧縮機は、低圧から中間圧まで冷媒を加圧する第１段圧縮室と中間圧から高圧まで冷媒を加圧する第２段圧縮室とを備えた２段圧縮機となっていることを特徴とする請求項１記載の冷蔵庫。 The compressor is a two-stage compressor including a first-stage compression chamber that pressurizes a refrigerant from a low pressure to an intermediate pressure and a second-stage compression chamber that pressurizes the refrigerant from an intermediate pressure to a high pressure. The refrigerator according to claim 1.

第２の冷却手段は、伝熱板に冷媒が流れる冷媒管を設けたパイプオンシート熱交換器又は伝熱板同志を重ね合せ、その内部に冷媒が流れる冷媒流路を形成したロールボンド熱交換器であることを特徴とする請求項１記載の冷蔵庫。The second cooling means includes a pipe-on-sheet heat exchanger in which a refrigerant pipe through which a refrigerant flows is provided on a heat transfer plate or a heat transfer plate, and a roll bond heat exchange in which a refrigerant flow path through which the refrigerant flows is formed. The refrigerator according to claim 1 , wherein the refrigerator is a container.