JP6539093B2

JP6539093B2 - refrigerator

Info

Publication number: JP6539093B2
Application number: JP2015085568A
Authority: JP
Inventors: 大平　昭義; 昭義大平; 慎一郎岡留; 利広小松; 康仁福井; 山下　太一郎; 太一郎山下
Original assignee: Hitachi Global Life Solutions Inc
Current assignee: Hitachi Global Life Solutions Inc
Priority date: 2015-04-20
Filing date: 2015-04-20
Publication date: 2019-07-03
Anticipated expiration: 2035-04-20
Also published as: JP2016205669A; CN106066110A; CN106066110B

Description

本発明は、冷蔵庫に関する。 The present invention relates to a refrigerator.

本技術分野の背景技術として、特許文献１が知られている。
特許文献１は、冷媒切換流路として、「４方弁２４→放熱パイプ１７→防露パイプ１８」の順で冷媒を流して省エネルギー性能を優先する第１の切換状態と、「４方弁２４→防露パイプ１８→放熱パイプ１７」の順で冷媒を流して防露を優先する第２の切換状態とを開示している（００１４、図１、２）。放熱パイプ１７は冷蔵庫本体１の背面部に埋設され、防露パイプ１８は貯蔵室２〜６の前面開口部の周縁部に位置する仕切部に装着されている（００１０）。
第１の切換状態では、放熱パイプ１７により温度が低下した冷媒を防露パイプ１８に流すことができるとしている（００１４）。また、第２の切換状態では、放熱パイプ１７よりも先に防露パイプ１８に冷媒を流すことにより、温度の高い冷媒を防露パイプ１８に流すことができるとしている。 Patent Document 1 is known as a background art of this technical field.
Patent Document 1 describes a first switching state in which the refrigerant is made to flow in the order of "four-way valve 24 → heat radiation pipe 17 → dew-proof pipe 18" as the refrigerant switching flow path to prioritize energy saving performance; The second switching state in which the refrigerant is made to flow in the order of the dew protection pipe 18 → the heat radiation pipe 17 to give priority to the dew protection is disclosed (0014, FIGS. 1 and 2). The heat radiation pipe 17 is embedded in the back of the refrigerator body 1, and the dewproof pipe 18 is attached to the partition located at the peripheral edge of the front opening of the storage rooms 2 to 6 (0010).
In the first switching state, the refrigerant whose temperature has been lowered by the heat radiation pipe 17 is allowed to flow through the dew prevention pipe 18 (0014). Further, in the second switching state, the refrigerant having a high temperature can be supplied to the dew proof pipe 18 by supplying the refrigerant to the dew proof pipe 18 earlier than the heat radiation pipe 17.

特開２０１２−１７９２０号公報JP, 2012-17920, A

特許文献１では、冷媒が流れる順番について、放熱パイプ１７が防露パイプ１８の先か後かを４方弁２４により切換可能としている。第１の切換状態では放熱パイプ１７で放熱した冷媒が防露パイプ１８に流入し、防露パイプ１８内で徐々に低温になるので、防露パイプ１８の上流側（放熱パイプ１７側）は、気液二相域又は液相域の上流側の冷媒が流れ、比較的高温になる。一方、第２の切換状態では放熱パイプ１７を経る前の冷媒が防露パイプ１８に流入するので、防露パイプ１８の下流側（放熱パイプ１７側）の冷媒も、基本的に気液二相域又は液相域の上流側であるので、比較的高温の冷媒である。このため、第１の切換え状態の場合も第２の切換状態の場合も、防露パイプ１８の放熱パイプ１７側（第１の切換え状態の上流側、第２の切換え状態の下流側）は比較的高温の冷媒が流れるので、庫内への熱流入量が大きくなり、省エネ性に改善の余地がある。 In Patent Document 1, the four-way valve 24 is capable of switching whether the heat radiation pipe 17 is ahead or behind the dew protection pipe 18 in the order in which the refrigerant flows. In the first switching state, the refrigerant that has dissipated heat by the heat release pipe 17 flows into the anti-dew pipe 18 and gradually decreases in temperature within the anti-dew pipe 18, so the upstream side of the anti-dew pipe 18 (the heat release pipe 17 side) The refrigerant on the upstream side of the gas-liquid two-phase region or the liquid phase region flows and becomes relatively high temperature. On the other hand, since the refrigerant before passing through the heat release pipe 17 flows into the anti-dew pipe 18 in the second switching state, the refrigerant on the downstream side of the anti-dew pipe 18 (on the heat release pipe 17 side) also basically has two phases of gas and liquid. As it is upstream of the zone or liquid phase zone, it is a relatively hot refrigerant. For this reason, the heat radiation pipe 17 side of the dew proof pipe 18 (upstream side of the first switching state, downstream side of the second switching state) is compared in the first switching state and the second switching state. Since the extremely high temperature refrigerant flows, the amount of heat inflow into the refrigerator becomes large, and there is room for improvement in the energy saving performance.

上記課題に鑑みてなされた第一の本発明は、冷媒を圧縮する圧縮機と、箱体の機械室、側面、天面及び背面の一箇所以上に設けた放熱器と、前記箱体の開口縁に設けられ、前記圧縮機が圧縮した冷媒が流れる結露抑制器と、流路切換え部と、減圧部と、冷却器と、を有する冷凍サイクルを備える冷蔵庫であって、前記流路切換え部は、前記放熱器、前記結露抑制器の一端側から他端側、前記減圧部の順に前記冷媒を流す第一状態と、前記放熱器、前記結露抑制器の他端側から一端側、前記減圧部の順に前記冷媒を流す第二状態と、を実行可能で、前記冷却器の除霜運転を実行可能で、前記第一状態から前記第二状態に切替えてから前記除霜運転を開始することを特徴とする。
また、上記事情に鑑みてなされた第二の本発明は、冷媒を圧縮する圧縮機と、箱体の機械室、側面、天面及び背面の一箇所以上に設けた放熱器と、前記箱体の開口縁に設けられ、前記圧縮機が圧縮した冷媒が流れる結露抑制器と、流路切換え部と、減圧部と、を有する冷凍サイクルを備える冷蔵庫であって、前記流路切換え部は、前記放熱器、前記結露抑制器の一端側から他端側、前記減圧部の順に前記冷媒を流す第一状態と、前記放熱器、前記結露抑制器の他端側から一端側、前記減圧部の順に前記冷媒を流す第二状態と、を実行可能で、湿度センサと、前記結露抑制器の一端側及び他端側にそれぞれ配された温度センサと、を有し、前記他端側の温度が露点温度以下になったと検知した後に、前記第一状態から前記第二状態へ切換え、前記一端側の温度が露点温度以下になったと検知した後に、前記第二状態から前記第一状態へ切換えることを特徴とする。
また、上記事情に鑑みてなされた第三の本発明は、冷媒を圧縮する圧縮機と、箱体の機械室、側面、天面及び背面の一箇所以上に設けた放熱器と、前記箱体の開口縁に設けられ、前記圧縮機が圧縮した冷媒が流れる結露抑制器と、流路切換え部と、減圧部と、を有する冷凍サイクルを備える冷蔵庫であって、前記流路切換え部は、前記放熱器、前記結露抑制器の一端側から他端側、前記減圧部の順に前記冷媒を流す第一状態と、前記放熱器、前記結露抑制器の他端側から一端側、前記減圧部の順に前記冷媒を流す第二状態と、を実行可能で、冷却運転中は基本的に前記第一状態とし、前記圧縮機を停止する直前に前記第二状態に切換えることを特徴とする。 The first present invention made in view of the above problems includes a compressor for compressing a refrigerant, a radiator provided at one or more locations of a machine room, a side surface, a top surface and a back surface of a box, and an opening of the box A refrigerator comprising a refrigeration cycle provided at a rim and having a condensation suppressor through which refrigerant compressed by the compressor flows , a flow path switching portion, a pressure reducing portion, and a cooler , the flow path switching portion A first state in which the refrigerant flows in the order of the radiator, one end to the other end of the condensation suppressor, and the decompression unit, the radiator, one end to the other end of the condensation suppressor, the decompression unit The second state in which the refrigerant flows in the order of can be executed , the defrosting operation of the cooler can be performed, and the defrosting operation is started after switching from the first state to the second state It features.
Further, according to the second aspect of the present invention made in view of the above circumstances, there is provided a compressor for compressing a refrigerant, a radiator provided at one or more locations of a machine room, a side surface, a top surface and a back surface of a box, and the box A refrigerator having a refrigeration cycle including: a condensation suppressor provided at an opening edge of the refrigerant flow passage through which the refrigerant compressed by the compressor flows; a flow passage switching portion; and a pressure reducing portion, the flow passage switching portion A radiator, a first state in which the refrigerant flows in the order of one end side to the other end side of the condensation suppressor, and the pressure reducing portion in this order, the radiator, the other end side of the condensation suppressor and one end side, the pressure reducing portion in order The second state in which the refrigerant flows is executable, and includes a humidity sensor and temperature sensors respectively disposed on one end side and the other end side of the condensation suppressor, and the temperature of the other end is a dew point After detecting that the temperature has become lower, the first state is switched to the second state, After the temperature of one end side is detected as equal to or less than the dew point temperature, characterized in that switching from the second state to the first state.
Further, a third invention made in view of the above circumstances is a compressor for compressing a refrigerant, a radiator provided at one or more places of a machine room, a side surface, a top surface and a back surface of a box, and the box A refrigerator having a refrigeration cycle including: a condensation suppressor provided at an opening edge of the refrigerant flow passage through which the refrigerant compressed by the compressor flows; a flow passage switching portion; and a pressure reducing portion, the flow passage switching portion A radiator, a first state in which the refrigerant flows in the order of one end side to the other end side of the condensation suppressor, and the pressure reducing portion in this order, the radiator, the other end side of the condensation suppressor and one end side, the pressure reducing portion in order The second state in which the refrigerant flows is executable, and the first state is basically set during the cooling operation, and the second state is switched immediately before the compressor is stopped.

実施例１の冷蔵庫の正面図Front view of the refrigerator of Example 1 図１のＡ−Ａ断面図A-A sectional view of FIG. 1 実施例１の冷蔵庫に設けた放熱器の配置を示す図The figure which shows arrangement | positioning of the radiator provided in the refrigerator of Example 1. 実施例１の断熱仕切り壁の断面模式図Cross-sectional schematic drawing of the heat insulation partition wall of Example 1 実施例１の冷蔵庫の冷凍サイクルの構成の概略図Schematic of the structure of the refrigerating cycle of the refrigerator of Example 1 実施例１の放熱器配管内部における冷媒の状態を模式的に表した図The figure which represented typically the state of the refrigerant | coolant inside the radiator piping of Example 1 実施例１の放熱器配管内部における冷媒の状態を模式的に表した図（液相域拡大の場合）The figure which represented the state of the refrigerant | coolant inside the radiator piping of Example 1 typically (in the case of liquid phase area expansion) 実施例１のモリエル線図Mollier diagram of Example 1 実施例１の結露抑制器を構成する配管表面の温度分布の概略を説明する図The figure which illustrates the outline of temperature distribution on the surface of piping which constitutes the dew condensation suppressor of Example 1 実施例１の冷蔵庫の冷凍サイクルの切換構成を示す図The figure which shows the switching structure of the refrigerating cycle of the refrigerator of Example 1. 実施例１の結露抑制器を構成する配管表面の温度分布の概略を示す図（第一状態と第二状態とを組合せた場合）The figure which shows the outline of the temperature distribution of the piping surface which comprises the dew condensation inhibitor of Example 1 (when the 1st state and the 2nd state are combined) 実施例２の冷蔵庫の冷凍サイクルの構成図Configuration diagram of the refrigeration cycle of the refrigerator of Example 2 実施例２の仕切りカバーの表面温度の経時変化を示す図The figure which shows a time-dependent change of the surface temperature of the partition cover of Example 2 実施例２の結露抑制器の加熱制御のイメージ図Image figure of heating control of the dew condensation suppressor of Example 2 実施例３の冷凍サイクルの構成図Configuration diagram of the refrigeration cycle of Embodiment 3 実施例３の冷凍サイクルの構成図（減圧部７３を選択した場合）Configuration diagram of the refrigeration cycle of Embodiment 3 (when the depressurizing unit 73 is selected) 実施例３の冷凍サイクルの構成図（減圧部６７を選択した場合）Configuration diagram of the refrigeration cycle of Embodiment 3 (when the pressure reducing unit 67 is selected)

以下、本発明の実施例について、添付の図面を参照しつつ詳細に説明する。同様の構成要素には同様の符号を付し、また、同様の説明は繰り返さない。 Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. Similar components are denoted by the same reference numerals, and the same description will not be repeated.

本発明の各種の構成要素は、必ずしも個々独立した存在である必要はなく、例えば、複数の構成要素が一個の部材として形成されていること、一つの構成要素が複数の部材で形成されていること、或る構成要素が他の構成要素の一部であること、或る構成要素の一部と他の構成要素の一部とが重複していること、を許容する。 The various components of the present invention do not necessarily have to be independent entities. For example, a plurality of components are formed as a single member, and a single component is formed of a plurality of members. It is permitted that a certain component is a part of another component, and a part of a certain component overlaps with a part of another component.

本実施例によれば、冷蔵庫の箱体前面の開口縁に設けた結露抑制器に流れる冷媒の温度を、結露を抑制しつつ比較的低温に維持し、また、結露抑制器を流れる冷媒の温度の時間平均をより近い値にできる。これにより、省エネルギー性能を向上させた冷蔵庫を提供できる。 According to the present embodiment, the temperature of the refrigerant flowing to the condensation suppressor provided at the opening edge of the front of the box of the refrigerator is maintained at a relatively low temperature while the condensation is suppressed, and the temperature of the refrigerant flowing through the condensation suppressor The time average of can be made closer. Thereby, the refrigerator which improved the energy saving performance can be provided.

［冷蔵庫１と開口縁］
図１は実施例１の冷蔵庫１の正面図である。冷蔵庫１の箱体１０は、上方から冷蔵室２、左右に併設された製氷室３と上段冷凍室４、下段冷凍室５、野菜室６の順番で貯蔵室を有している。冷蔵庫１はそれぞれの貯蔵室の開口を開閉するドアを備えている。これらのドアは、左右に分割された回転式で、冷蔵室２の開口を開閉する冷蔵室ドア２ａ、２ｂと、製氷室３、上段冷凍室４、下段冷凍室５、野菜室６の開口をそれぞれ開閉する引き出し式の製氷室ドア３ａ、上段冷凍室ドア４ａ、下段冷凍室ドア５ａ、野菜室ドア６ａである。以下では、製氷室３、上段冷凍室４、下段冷凍室５は、まとめて冷凍室７と呼ぶ。 [Fridge 1 and Opening Edge]
FIG. 1 is a front view of the refrigerator 1 of the first embodiment. The box 10 of the refrigerator 1 has a storage room in the order of a cold storage room 2 from above, an ice making room 3 and an upper freezing room 4, a lower freezing room 5, and a vegetable room 6 arranged side by side. The refrigerator 1 is provided with a door which opens and closes the opening of each storage room. These doors are rotary type divided into right and left, and the openings of the cold storage room doors 2a and 2b for opening and closing the opening of the cold storage room 2, the ice making room 3, the upper freezing room 4, the lower freezing room 5 and the vegetable room 6 They are a drawer type icemaker door 3a, an upper freezer compartment door 4a, a lower freezer compartment door 5a, and a vegetable compartment door 6a which are respectively opened and closed. Below, the icemaker 3, the upper stage freezer compartment 4, and the lower freezer compartment 5 are collectively called the freezer compartment 7. FIG.

ドア２ａ、２ｂ、３ａ、４ａ、５ａ、６ａの閉状態で、ドア２ａ、２ｂ、３ａ、４ａ、５ａ、６ａが接する箱体１０の断熱仕切り壁２８、４０、２９の前方端部には、それぞれ仕切りカバー３６ａ、３６ｂ、３６ｃを設けてある。また、冷蔵庫１の底面部に設けた断熱仕切り壁４６の前方にも、仕切りカバー３６ｄを設けている。なお、箱体１０のうち、ドア２ａ、２ｂ、３ａ、４ａ、５ａ、６ａが閉状態で接する箇所を開口縁と呼び、仕切りカバー（仕切り部）３６はこの開口縁に設けられている。 The front ends of the heat insulating partition walls 28, 40, 29 of the box 10 which the doors 2a, 2b, 3a, 4a, 5a, 6a contact with the doors 2a, 2b, 3a, 4a, 5a, 6a closed Partition covers 36a, 36b and 36c are provided respectively. In addition, a partition cover 36d is provided also in front of the heat insulating partition wall 46 provided on the bottom of the refrigerator 1. In addition, the location which door 2a, 2b, 3a, 4a, 5a, 6a contact | connects in the closed state among the box 10 is called an opening edge, and the partition cover (partition part) 36 is provided in this opening edge.

引き出し式のドア３ａ、４ａ、５ａ、６ａを開くと、庫外の空気が開口に接触するため結露が生じるおそれがある。このため、これらのドア近くの開口には、冷媒が流れる配管（結露抑制器５３）を設けている。結露抑制器５３に温冷媒を供給することで、開口縁の結露を抑制できる。結露抑制器５３は、仕切りカバー３６で覆われている。 When the drawer-type doors 3a, 4a, 5a, 6a are opened, air outside the storage chamber may come in contact with the openings, which may cause condensation. Therefore, piping (condensation suppressor 53) through which the refrigerant flows is provided at the openings near these doors. By supplying the temperature control refrigerant to the condensation suppressor 53, condensation on the opening edge can be suppressed. The dew condensation suppressor 53 is covered by a partition cover 36.

図２は図１のＡ−Ａ断面図である。断熱仕切壁２８によって、冷蔵室２、上段冷凍室４及び製氷室３が隔てられ、断熱仕切壁２９によって下段冷凍室５と野菜室６が隔てられている。 FIG. 2 is a cross-sectional view taken along line A-A of FIG. The refrigerator compartment 2, the upper stage freezer compartment 4 and the ice making chamber 3 are separated by the heat insulation partition wall 28, and the lower freezer compartment 5 and the vegetable compartment 6 are separated by the heat insulation partition wall 29.

冷却器１４は下段冷凍室５の略背部に備えた冷却器収納室８内に設けてあり、冷却器１４の上方に設けたファン９により、冷却器１４と熱交換した冷気が冷蔵室２、上段冷凍室４、下段冷凍室５、製氷室３の各貯蔵室へ送られる。 The cooler 14 is provided in the cooler storage chamber 8 provided substantially at the back of the lower stage freezing chamber 5, and the cold air heat-exchanged with the cooler 14 by the fan 9 provided above the cooler 14 is the refrigerator compartment 2, It is sent to each storage room of the upper stage freezing room 4, the lower stage freezing room 5, and the ice making room 3.

冷蔵室２を冷却する冷蔵室冷却運転の場合には、冷蔵室ダンパ２０を開、冷凍室ダンパ２１を閉にして冷蔵室２に冷気を送る。 In the case of a refrigerator compartment cooling operation for cooling the refrigerator compartment 2, the refrigerator compartment damper 20 is opened, the freezer compartment damper 21 is closed, and cold air is sent to the refrigerator compartment 2.

冷凍室７を冷却する冷凍室冷却運転の場合には、冷蔵室ダンパ２０を閉、冷凍室ダンパ２１を開にして上段冷凍室４、下段冷凍室５、及び製氷室３に冷気を送る。冷蔵室２、及び冷凍室７の温度は、庫内に設けた冷蔵室温度センサ４１、冷凍室温度センサ４２で検知され、庫内の温度に応じて冷蔵室２と冷凍室７を同時に冷却する運転もあり、その場合には冷蔵室ダンパ２０と冷凍室ダンパ２１をいずれも開にして各貯蔵室に冷気を送風する。 In the case of a freezing room cooling operation for cooling the freezing room 7, the cold storage room damper 20 is closed and the freezing room damper 21 is opened to send cold air to the upper freezing room 4, the lower freezing room 5, and the ice making room 3. The temperatures of the refrigerator compartment 2 and the freezer compartment 7 are detected by the refrigerator compartment temperature sensor 41 and the freezer compartment temperature sensor 42 provided in the compartment, and simultaneously cool the refrigerator compartment 2 and the freezer compartment 7 according to the temperature inside the compartment. There is also an operation, in which case the cold room damper 20 and the freezer room damper 21 are both opened to blow cold air into each storage room.

［放熱器５０−５２、結露抑制器５３］
図３は冷蔵庫１に設けた放熱器の配置を示す図である。放熱器としては、例えば箱体１０の表面近傍に配した冷媒が流れる配管を採用できる。第一の放熱器５０は、冷蔵庫１の背面側下部に設けた機械室３９内に設置してある。第二の放熱器５１と第三の放熱器５２は冷蔵庫１の側面断熱壁内に埋設している。結露抑制器５３は、開口縁の一部又は全部に配設されている。第二の放熱器５１、第三の放熱器５２は、冷蔵庫１の側面に代えて天面や背面に沿って配置してもよい。また、第一の放熱器５０、第二の放熱器５１及び第三の放熱器５２を全部備えることが好ましいが、何れか一つ以上を備えていればよい。 [Gas radiator 50-52, dew condensation suppressor 53]
FIG. 3 is a view showing the arrangement of the radiator provided in the refrigerator 1. As the radiator, for example, piping through which the refrigerant disposed near the surface of the box 10 flows can be adopted. The first radiator 50 is installed in a machine room 39 provided at the lower rear side of the refrigerator 1. The second radiator 51 and the third radiator 52 are embedded in the side heat insulating wall of the refrigerator 1. The dew condensation suppressor 53 is disposed at a part or all of the opening edge. The second radiator 51 and the third radiator 52 may be disposed along the top surface or the back surface instead of the side surface of the refrigerator 1. In addition, it is preferable that all of the first radiator 50, the second radiator 51, and the third radiator 52 be provided, but any one or more may be provided.

結露抑制器５３は、野菜室６付近（領域Ａ）、冷凍室５の中間（領域Ｂ）、冷凍室７の上部付近（領域Ｃ）に設けられており、冷媒からの放熱によって開口縁を加熱している。結露抑制器５３の端部は、冷媒が流れる配管が開口縁から離間する部分と考えてもよい。図３では、冷媒が機械室３９側から野菜室６下方の開口縁に向かって流れ、冷凍室７の開口縁を経た後に、冷凍室７及び野菜室６側方の開口縁を経てから機械室３９側へ向かって流れる場合を例示している。この場合、結露抑制器５３は、後述するパイプ５７から野菜室６下方の開口縁に至った点ｄを一端と、野菜室６側方の開口縁からパイプ５８を経て流路切換え弁４８へ向かい始める点ｆを他端と考えることができる。結露抑制器５３は、冷凍室ドア３ａ、４ａ、５ａに接する開口縁を含んで設けているが、野菜室のドア６ａに接する開口縁や観音式の冷蔵室のドア２ａ、２ｂに接する開口縁を含んで設けても良い。なお、冷蔵庫１の冷蔵室や冷凍室の室数は特に限定されない。また、各貯蔵室のドアタイプは引き出し式と観音式の何れでも良い。 The condensation suppressor 53 is provided near the vegetable room 6 (area A), in the middle of the freezing room 5 (area B), near the upper part of the freezing room 7 (area C), and heats the opening edge by heat dissipation from the refrigerant. doing. The end of the condensation suppressor 53 may be considered as a portion where the pipe through which the refrigerant flows is separated from the opening edge. In FIG. 3, the refrigerant flows from the machine room 39 toward the opening edge below the vegetable room 6, passes through the opening edge of the freezing room 7, and then passes through the opening edge on the side of the freezing room 7 and the vegetable room 6. It illustrates the case of flowing toward the 39 side. In this case, the condensation suppressing device 53 is directed to the flow path switching valve 48 through the pipe 58 from the opening edge on the side of the vegetable compartment 6 and one end from the pipe 57 to be described later. The starting point f can be considered as the other end. Although the dew condensation suppressing device 53 is provided including the opening edge in contact with the freezing room door 3a, 4a, 5a, the opening edge in contact with the vegetable room door 6a or the opening edge in contact with the non-smoking refrigerator compartment door 2a, 2b May be included. In addition, the number of rooms of the refrigerator compartment of the refrigerator 1 or a freezer compartment is not specifically limited. In addition, the door type of each storage room may be either a pull-out type or a Kannon type.

図４は開口縁の一例である断熱仕切り壁２９、４０の断面模式図である。ドア３ａ、４ａ、５ａが接する又は近傍に位置する仕切りカバー３６ｂ、３６ｃと略接触するように、結露抑制器５３のパイプを設けている。結露抑制器５３に冷媒を流すと、熱４４により仕切りカバー３６ａ、３６ｂ、３６ｃを加熱して結露を抑制できる。しかし、結露抑制器５３は冷凍室を加熱する熱４５も発生させる。このため、結露を抑制可能な温度範囲で、結露抑制器５３を流れる冷媒の温度を低くすることが好ましい。
断熱仕切り壁２９、４０と同様に、ドア３ａ、４ａ、６ａが接する又は近傍に位置する断熱仕切り壁２８、４６の仕切りカバー３６ａ、３６ｄにも、結露抑制器５３を配設している。 FIG. 4: is a cross-sectional schematic diagram of the heat insulation partition walls 29 and 40 which are an example of an opening edge. The pipe of the condensation suppressing device 53 is provided so as to substantially contact the partition covers 36b and 36c located in contact with or in the vicinity of the doors 3a, 4a and 5a. When the refrigerant is caused to flow through the condensation suppressor 53, heat can be used to heat the partition covers 36a, 36b, and 36c to suppress condensation. However, the condensation suppressor 53 also generates heat 45 for heating the freezing chamber. For this reason, it is preferable to lower the temperature of the refrigerant flowing through the condensation suppressor 53 within a temperature range in which condensation can be suppressed.
Similar to the heat insulating partition walls 29 and 40, the dew condensation suppressor 53 is disposed also on the partition covers 36a and 36d of the heat insulating partition walls 28 and 46 located in contact with or near the doors 3a, 4a and 6a.

第二の放熱器５１、第三の放熱器５２を配設する冷蔵庫１の側方や背方は、周囲に暖房器具等が設置され得るが、結露抑制器５３は箱体１０の開口側に埋設してあるため、冷蔵庫１の周囲の急な温度変化の影響を受け難い。放熱器５０−５２及び結露抑制器５３の中で最下流に結露抑制器５３を配することで、減圧部６７に流入させる冷媒の温度を効果的に低下させておくことができる。 Heating appliances etc. may be installed around the side and back of the refrigerator 1 which arranges the 2nd radiator 51 and the 3rd radiator 52, but the condensation suppression device 53 is on the opening side of the box 10 Because it is buried, it is unlikely to be affected by a sudden temperature change around the refrigerator 1. By disposing the condensation suppressor 53 on the most downstream side among the radiators 50 to 52 and the condensation suppressor 53, the temperature of the refrigerant flowing into the pressure reducing portion 67 can be effectively reduced.

［冷凍サイクル］
図５は冷凍サイクルの構成の概略図である。冷蔵庫１は、冷凍サイクルによる冷媒の循環を利用して冷気を生成している。冷媒を圧縮する圧縮機２４の吐出側のパイプ５５には第一の放熱器５０を接続している。第一の放熱器５０から順番に、第二の放熱器５１及び第三の放熱器５２、流路切換え弁４８の開口７４に接続されている。第一の放熱器５０を冷却する機械室ファン５４を設けても良い。 [Freezing cycle]
FIG. 5 is a schematic view of the configuration of the refrigeration cycle. The refrigerator 1 generates cold air by using the circulation of the refrigerant by the refrigeration cycle. A first radiator 50 is connected to the pipe 55 on the discharge side of the compressor 24 for compressing the refrigerant. The second radiator 51, the third radiator 52, and the opening 74 of the flow path switching valve 48 are connected in order from the first radiator 50. A machine room fan 54 may be provided to cool the first radiator 50.

流路切換え弁４８の内部には流路９３、９４を設けた弁体７８を備えてある。流路切換え弁４８は４つの開口７４、７５、７６、７７と弁体７８とを有している。後述するように、例えばステッピングモータ（図示なし）などで弁体７８を回転させることで、流路９３、９４と連通させる開口７４−７７を切換できる。 Inside the flow path switching valve 48, a valve body 78 provided with flow paths 93 and 94 is provided. The flow path switching valve 48 has four openings 74, 75, 76, 77 and a valve body 78. As will be described later, by rotating the valve body 78 with, for example, a stepping motor (not shown) or the like, the openings 74 to 77 communicated with the flow paths 93 and 94 can be switched.

図５に例示した状態は後述する第一状態であり、開口７４、７５は流路９３と連通し、開口７６、７７は流路９４と連通している。この状態における冷凍サイクルを説明する。 The state illustrated in FIG. 5 is the first state described later, and the openings 74 and 75 communicate with the flow path 93, and the openings 76 and 77 communicate with the flow path 94. The refrigeration cycle in this state will be described.

まず、パイプ５６を通過して開口７４から流路切換え弁４８の内部に流入した冷媒は、流路９３、開口７５を通過して、結露抑制器５３の一端及び流路切換え弁４８に接続するパイプ５７へ流出する。冷媒はその後、結露抑制器５３の一端ｄから他端ｆに流れ、結露抑制器５３の他端及び流路切換え弁４８に接続するパイプ５８を経て、開口７７から流路切換え弁４８の内部に流入する。流路切換え弁４８の内部に流入した冷媒は、流路９４、開口７６を通過してパイプ５９に流出する。 First, the refrigerant flowing through the pipe 56 and flowing into the flow path switching valve 48 from the opening 74 passes through the flow path 93 and the opening 75 and is connected to one end of the condensation suppressor 53 and the flow path switching valve 48 It flows into the pipe 57. The refrigerant then flows from one end d to the other end f of the condensation suppressor 53, passes through the pipe 58 connected to the other end of the condensation suppressor 53 and the flow path switching valve 48, and enters the flow path switching valve 48 from the opening 77. To flow. The refrigerant that has flowed into the flow path switching valve 48 passes through the flow path 94 and the opening 76 and flows out to the pipe 59.

パイプ５９に流出した冷媒は、ドライヤ６６、減圧部６７、パイプ６８を経て冷却器１４に流れる。冷却器１４の出口側には、減圧部６７の近傍に配されることで減圧部６７を流れる冷媒と熱交換可能な熱交換部６９を有するパイプ７０が接続している。冷却器１４を通過した冷媒は、パイプ７０を経て圧縮機２４の吸込側に流れる。 The refrigerant flowing out to the pipe 59 flows to the cooler 14 through the dryer 66, the pressure reducing section 67, and the pipe 68. The outlet side of the cooler 14 is connected to a pipe 70 having a heat exchange portion 69 capable of exchanging heat with the refrigerant flowing in the pressure reducing portion 67 by being disposed in the vicinity of the pressure reducing portion 67. The refrigerant having passed through the cooler 14 flows through the pipe 70 to the suction side of the compressor 24.

減圧部６７は冷媒を減圧させるものであり、キャピラリチューブや膨張弁など、種々公知の構成を採用できる。結露抑制器５３は放熱器５０−５２及び結露抑制器５３の中で最下流側に設けてあり、これらの中では減圧部６７に最も近い位置に設けられている。 The pressure reducing portion 67 is used to reduce the pressure of the refrigerant, and various known configurations such as a capillary tube and an expansion valve can be adopted. The dew condensation suppressor 53 is provided on the most downstream side among the radiators 50 to 52 and the dew condensation inhibitor 53, and among these, it is provided at a position closest to the pressure reducing portion 67.

［冷媒の相状態］
図６は放熱器内部における冷媒の状態を模式的に表したものである。第一の放熱器５０（区間ａｃ）、第二の放熱器５１及び第三の放熱器５２（区間ｃｄ）、結露抑制器５３（区間ｄｆ）内部の冷媒状態を説明する。図６に示した記号ａ〜ｆは、図５中に示した冷凍サイクルでの各位置に対応しており、記号ａは圧縮機２４の吐出側、記号ｂは冷媒が気相域から気液二相域になる点、記号ｃは第一の放熱器５０と第二の放熱器５１の間、記号ｄは結露抑制器５３の一端、記号ｅは冷媒が気液二相域から液相域になる点、記号ｆは結露抑制器５３の他端を表している。記号ｄ、ｆは図３にも示している。ここでは、冷媒が結露抑制器５３の一端ｄ側から他端ｆ側に流れている場合を説明する。 [Phase state of refrigerant]
FIG. 6 schematically shows the state of the refrigerant inside the radiator. The refrigerant states in the first radiator 50 (section ac), the second radiator 51 and the third radiator 52 (section cd), and the condensation suppressor 53 (section df) will be described. Symbols a to f shown in FIG. 6 correspond to the respective positions in the refrigeration cycle shown in FIG. 5, where symbol a is the discharge side of the compressor 24 and symbol b is the gas phase from the gas phase region of the refrigerant. The point that it becomes a two-phase area, symbol c is between the first radiator 50 and the second radiator 51, the symbol d is one end of the condensation suppressor 53, the symbol e is the gas-liquid two-phase region to the liquid phase region The symbol f represents the other end of the dew condensation suppressor 53. The symbols d and f are also shown in FIG. Here, the case where the refrigerant is flowing from the one end d side of the condensation suppressing device 53 to the other end f side will be described.

圧縮機２４で圧縮されて高温高圧になった冷媒は、気相成分７１から成る気相域である。冷媒は第一乃至第三の放熱器５０−５２を通過して庫外に熱を放出し、結露抑制器５３の一端ｄに至るまでに、気相成分７１と液相成分７２の混合である気液二相域又は液相成分７２から成る液相域のうち、エンタルピが大きい状態に変化するように、配管長さや機械室ファン５４の回転数などが調整されている。結露の効果的な抑制の観点からは、結露抑制器５３の一端ｄを流れる冷媒は気液二相域が好ましい。また、結露抑制器５３の他端ｆを流れる冷媒が液相域になるように調整すると好ましい。ここでは、第一の放熱器５０の途中まで（区間ａｂ）が気相域になり、第一の放熱器５０の途中から結露抑制器５３の途中まで（区間ｂｅ）が気液二相域になり、結露抑制器５３の途中から他端まで（区間ｅｆ）が液相域になるように調整している。そのため、図５の冷媒の流れにおいて、結露抑制器５３の流入側である端部５３ｄに対し、流出側の端部５３ｆの方が温度が低くなる。 The refrigerant compressed by the compressor 24 to a high temperature and a high pressure is a gas phase region composed of the gas component 71. The refrigerant passes through the first to third radiators 50 to 52 to release the heat to the outside of the storage, and is a mixture of the gas phase component 71 and the liquid phase component 72 until it reaches one end d of the condensation suppressing device 53 The pipe length, the rotation speed of the machine room fan 54, and the like are adjusted so that the enthalpy changes to a large state in the liquid-phase area including the gas-liquid two-phase area or the liquid phase component 72. From the viewpoint of effective suppression of condensation, the refrigerant flowing through one end d of the condensation suppressor 53 is preferably a gas-liquid two-phase region. Further, it is preferable to adjust the refrigerant flowing in the other end f of the condensation suppressing device 53 to be in the liquid phase region. Here, the middle of the first radiator 50 (section ab) is a gas phase area, and the middle of the first radiator 50 to the middle of the condensation suppression unit 53 (section be) is a gas-liquid two-phase area. The interval from the middle of the condensation suppressing device 53 to the other end (section ef) is adjusted to be in the liquid phase region. Therefore, in the flow of the refrigerant in FIG. 5, the temperature of the end portion 53 f on the outflow side is lower than that of the end portion 53 d on the inflow side of the condensation suppressing device 53.

流路切換え弁４８は、後述する第一状態と第二状態とを切換えることで、パイプ５７、結露抑制器５３、及びパイプ５８を冷媒が流れる順番を変更する。すなわち、第一状態では、冷媒はパイプ５７、結露抑制器５３、パイプ５８の順番に流れ、かつ、結露抑制器５３については一端ｄから他端ｆに向けて流れる。一方、第二状態ではパイプ５８、結露抑制器５３、パイプ５７の順番に流れ、かつ、結露抑制器５３については他端ｆから一端ｄに向けて流れる。 The flow path switching valve 48 changes the order in which the refrigerant flows through the pipe 57, the condensation suppression device 53, and the pipe 58 by switching between a first state and a second state described later. That is, in the first state, the refrigerant flows in the order of the pipe 57, the condensation suppressor 53, and the pipe 58, and the condensation suppressor 53 flows from one end d to the other end f. On the other hand, in the second state, the pipe 58, the condensation suppressor 53, and the pipe 57 flow in order, and the condensation suppressor 53 flows from the other end f toward one end d.

ここで、圧縮機２４の吐出側端部（図５中の記号ａの地点）から減圧部６７上流側までの配管長さに対し、開口７５から開口７７までの配管長さ、すなわち、パイプ５７、結露抑制器５３及びパイプ５８の配管長さの下限値を、例えば１０％、１５％、２０％、２５％にできる。この配管長さを長くすると、冷媒が結露抑制器５３を流れる中で徐々に低温になり、結露抑制器５３の下流側を、比較的温度の低い液相域の冷媒が流れるようになるので庫内への熱侵入量を抑制できる。一方、パイプ５７、結露抑制器５３及びパイプ５８の配管長さの上限値は、例えば、圧縮機２４の吐出側端部から減圧部６７上流側までの配管長さの５０％、４０％、３０％にできる。この配管長さを短くすると、結露抑制器５３の上流側を、例えば気液二相域、または液相域の上流側で、比較的温度の高い冷媒で加熱して、結露を効果的に抑制できる。すなわち、結露抑制器５３の上流側は結露を効果的に抑制できるよう加熱し易くなっており、下流側は熱侵入量を抑制できるよう加熱を抑えている。 Here, the piping length from the opening 75 to the opening 77 with respect to the piping length from the discharge side end of the compressor 24 (point a in FIG. 5) to the upstream side of the pressure reducing portion 67, ie, the pipe 57 The lower limit values of the piping lengths of the condensation suppression device 53 and the pipe 58 can be set to, for example, 10%, 15%, 20%, and 25%. If this piping length is increased, the temperature of the refrigerant gradually decreases while flowing through the condensation suppressor 53, and the refrigerant of a relatively low temperature liquid phase region flows on the downstream side of the condensation suppressor 53, so It is possible to suppress the amount of heat penetration into the inside. On the other hand, the upper limit values of the pipe lengths of the pipe 57, the condensation suppression device 53 and the pipe 58 are, for example, 50%, 40%, and 30 of the pipe length from the discharge side end of the compressor 24 to the upstream side of the pressure reducing unit 67 It can be%. If the piping length is shortened, the condensation side can be effectively suppressed by heating the upstream side of the condensation suppressor 53 with a relatively high temperature refrigerant, for example, in the gas-liquid two-phase area or the upstream side of the liquid phase area. it can. That is, the upstream side of the condensation suppressor 53 is easily heated so as to effectively suppress condensation, and the downstream side is suppressed so as to suppress the amount of heat penetration.

また、パイプ５７、結露抑制器５３及びパイプ５８の配管長さに対して、結露抑制器５３の配管長さの下限値を、例えば５０％、６５％、８０％にできる。結露抑制器５３の配管長さを長くすると、結露抑制器５３の上流側を気液二相域または比較的温度の高い液相域の冷媒が流れ、下流側を比較的温度の低い液相域の冷媒が流れ、上記した効果が得やすくなる。また、結露抑制器５３の下流側、すなわち第一状態のパイプ５８、第二状態のパイプ５７は、密度の高い液冷媒が流れるので、パイプ５７、５８を比較的短くすることで、冷凍サイクルに封入する冷媒量を抑えている。このとき、パイプ５７及びパイプ５８それぞれの配管長さは互いに略同じにしても良いし異ならせても良いが、後述する第一状態と第二状態の切換での対称性を高める観点から、略同じだと好ましい。上記のように配管長さを設定することで、後述する第一状態及び第二状態の何れにおいても、結露防止パイプ５３の上流側を、気液二相域または比較的温度の高い液相域の冷媒が流れ、下流側を比較的温度の低い液相域の冷媒が流れるので、結露抑制器５３の一端及び他端の温度差を大きくできる。これにより、結露抑制と開口縁から貯蔵室内への熱侵入量の抑制を両立できる。結露抑制器５３の一部を液相域で冷媒が流れるため、結露抑制器５３の一端と他端に温度差が生じる。結露抑制と熱侵入量の抑制の両立の観点から、温度差が１℃以上生じるようにすると好ましい。 The lower limit of the piping length of the condensation suppressor 53 can be set to, for example, 50%, 65%, and 80% of the piping length of the pipe 57, the condensation suppressor 53, and the pipe 58, for example. When the piping length of the condensation suppressor 53 is increased, the refrigerant in the gas-liquid two-phase region or the liquid phase region having a relatively high temperature flows on the upstream side of the condensation suppressor 53, and the liquid phase region on the downstream side has a relatively low temperature The flow of the refrigerant makes it easy to obtain the above-mentioned effects. In the downstream side of the condensation suppression device 53, that is, the pipe 58 in the first state, and the pipe 57 in the second state, liquid refrigerant with high density flows. The amount of refrigerant to be sealed is reduced. At this time, the pipe lengths of the pipe 57 and the pipe 58 may be substantially the same or different, but from the viewpoint of enhancing the symmetry in switching between the first state and the second state described later, It is preferable that it is the same. By setting the pipe length as described above, the upstream side of the condensation prevention pipe 53 in either the first state or the second state described later can be a gas-liquid two-phase region or a liquid phase region having a relatively high temperature. Because the refrigerant of the above flows and the refrigerant of the relatively low temperature liquid phase region flows downstream, the temperature difference between one end and the other end of the dew condensation suppressor 53 can be increased. As a result, it is possible to achieve both the suppression of condensation and the suppression of the amount of heat intrusion from the opening edge into the storage room. Since the refrigerant flows in a part of the condensation suppression device 53 in the liquid phase region, a temperature difference occurs between one end and the other end of the condensation suppression device 53. From the viewpoint of achieving both suppression of condensation and suppression of the amount of heat penetration, it is preferable that a temperature difference of 1 ° C. or more be generated.

図７は、図６で例示した場合よりも液相域が拡大した場合の冷媒の状態を示す図である。図８は冷媒状態を説明するモリエル線図である。図８（ａ）は図６に対応し、図８（ｂ）は図７に対応する。図８に示す点ａ−ｆは、図５で示す各点ａ−ｆにおける冷媒の圧力と比エンタルピに対応している。
例えば、減圧部６７による減圧量を大きくした場合や、機械室ファン５４を高速運転させて第一の放熱器５０の放熱性能を向上させた場合、気液二相域から液相域に変化する冷凍サイクルでの点ｅが上流側ｅ１に移動する。そのため、図６に示した液相域（区間ｅｆ）が、図７に示した液相域（区間ｅ_１ｆ）に拡大し、第四の結露抑制器５３の配管内を占める液相域が長くなる。従って、結露抑制器５３のより上流側から冷媒の温度低下が始まり、結露抑制器５３の他端ｆの液相冷媒のエンタルピは、モリエル線図に示す図８（ａ）の点ｆから低下して、図８（ｂ）の点ｆになる。このため、図８（ａ）に比べ、図８（ｂ）の方が減圧部６７に流入する冷媒の比エンタルピが低下する。これにより、熱交換部６９で熱交換する冷媒のエンタルピ差を大きくすることができるので、省エネルギー性能が向上する。 FIG. 7 is a diagram showing the state of the refrigerant when the liquid phase region is expanded compared to the case illustrated in FIG. FIG. 8 is a Mollier diagram explaining the refrigerant state. 8 (a) corresponds to FIG. 6, and FIG. 8 (b) corresponds to FIG. Point af shown in FIG. 8 corresponds to the pressure and specific enthalpy of the refrigerant at each point af shown in FIG.
For example, when the amount of pressure reduction by the pressure reducing portion 67 is increased or when the heat dissipation performance of the first radiator 50 is improved by operating the machine room fan 54 at high speed, the gas-liquid two-phase region changes to the liquid phase region The point e in the refrigeration cycle moves to the upstream side e1. Therefore, the liquid phase area (section ef) shown in FIG. 6 is expanded to the liquid phase area (section e ₁ f) shown in FIG. 7, and the liquid phase area that occupies the inside of the piping of the fourth condensation suppressor 53 is become longer. Therefore, the temperature decrease of the refrigerant starts from the more upstream side of the condensation suppressing device 53, and the enthalpy of the liquid-phase refrigerant at the other end f of the condensation suppressing device 53 decreases from the point f in FIG. Thus, the point f in FIG. For this reason, the specific enthalpy of the refrigerant flowing into the pressure reducing portion 67 is lower in FIG. 8B compared to FIG. 8A. Thereby, the enthalpy difference of the refrigerant heat-exchanged in the heat exchange part 69 can be enlarged, and the energy saving performance is improved.

図９は結露抑制器５３（区間ｄｆ）の温度分布の概略を説明する図である。図９（ａ）は図６に対応し、図９（ｂ）は図７に対応する。
図９（ａ）、（ｂ）いずれの場合も、結露抑制器５３の上流側（区間ｄｅ、ｄｅ_１）は気液二相域のため冷媒温度は一定に保たれるが、区間ｅｆ、ｅ_１ｆは液相域のため冷媒温度は徐々に低くなり、結露抑制器５３の端部５３ｆ側に位置する開口縁の平均温度はTＣ、TＣ１となる。結露抑制器５３における液相域長さを増加させた図９（ｂ）の場合は、結露抑制器５３の配管内で液相域となっている長さが増加するので、TＣ１はTＣより低い。 FIG. 9 is a diagram for explaining an outline of the temperature distribution of the condensation prevention device 53 (section df). FIG. 9 (a) corresponds to FIG. 6, and FIG. 9 (b) corresponds to FIG.
In both cases of FIGS. 9 (a) and 9 (b), the refrigerant temperature is kept constant since the upstream side (sections de and de ₁ ) of the condensation suppressor 53 is a gas-liquid two-phase area, but sections ef and e _{Since 1} f is in the liquid phase region, the refrigerant temperature gradually decreases, and the average temperature of the opening edge located on the end 53 f side of the condensation suppressing device 53 is TC, TC 1. In the case of FIG. 9 (b) in which the liquid phase length in the dew condensation suppressor 53 is increased, the length of the liquid phase area in the piping of the dew condensation inhibitor 53 increases, so TC1 is lower than TC. .

［冷凍サイクルの切換］
図１０は冷凍サイクルの切換構成を示す図である。流路切換え弁４８は、結露抑制器５３に流す冷媒の向きを切換え可能である。 [Switching of refrigeration cycle]
FIG. 10 is a diagram showing a switching configuration of the refrigeration cycle. The flow path switching valve 48 can switch the direction of the refrigerant flowing to the condensation suppressor 53.

図１０（ａ）は、野菜室６の開口縁を含む領域Ａから冷凍室７上部の開口縁を含む領域Ｃに向かって冷媒を流す第一状態を示す図である。図１０（ｂ）は、領域Ｃから領域Ａに向かって冷媒を流す第二状態を示す図である。 FIG. 10A shows a first state in which the refrigerant flows from the area A including the opening edge of the vegetable compartment 6 toward the area C including the opening edge of the upper part of the freezing room 7. FIG. 10 (b) is a diagram showing a second state in which the refrigerant flows from the area C toward the area A.

第一状態での冷媒の流れは上述した通りであるので、第二状態での冷媒の流れについて説明する。第二状態では、流路切換え弁４８の内部に設けた弁体７８を第一状態から回転させて、開口７４、７７を流路９４と連通させ、開口７５、７６を流路９３と連通させている。第一乃至第三の放熱器５０−５２を通過した冷媒は開口７４から流路切換え弁４８の内部に流入し、開口７７に接続しているパイプ５８から流出して、結露抑制器５３の他端ｆである領域Ｃの側から一端ｄである領域Ａの側に向かって流れる。その後、冷媒はパイプ５７を通過して開口７５から流路切換え弁４３の内部に再度流入する。流路切換え弁４３の内部に流入した冷媒は流路９３を通過して、開口７６に接続されたパイプ５９に流出する。 Since the flow of the refrigerant in the first state is as described above, the flow of the refrigerant in the second state will be described. In the second state, the valve body 78 provided inside the flow path switching valve 48 is rotated from the first state to make the openings 74 and 77 communicate with the flow path 94 and communicate the openings 75 and 76 with the flow path 93 ing. The refrigerant that has passed through the first to third radiators 50 to 52 flows into the flow path switching valve 48 through the opening 74 and flows out of the pipe 58 connected to the opening 77. It flows from the side of the region C which is the end f toward the side of the region A which is the one end d. Thereafter, the refrigerant passes through the pipe 57 and flows into the flow path switching valve 43 again from the opening 75. The refrigerant that has flowed into the flow path switching valve 43 passes through the flow path 93 and flows out to the pipe 59 connected to the opening 76.

図１１は結露抑制器５３の温度分布の概略を示す図である。図１１(ａ）は第二状態における結露抑制器５３を流れる冷媒の温度分布であり、図１１（ｂ）は第一状態と第二状態を組み合わせた場合における、結露抑制器５３を流れる冷媒の温度分布である。なお、第一状態における結露抑制器５３を流れる冷媒の温度分布は、図９（ｂ）に示したものと同様である。また、図１１（ｂ）に示す各温度は時間平均した値である。 FIG. 11 is a diagram schematically showing the temperature distribution of the dew condensation suppressor 53. As shown in FIG. FIG. 11 (a) shows the temperature distribution of the refrigerant flowing through the condensation suppressor 53 in the second state, and FIG. 11 (b) shows the refrigerant flowing through the condensation suppressor 53 when the first state and the second state are combined. It is a temperature distribution. The temperature distribution of the refrigerant flowing through the dew condensation suppressor 53 in the first state is the same as that shown in FIG. Moreover, each temperature shown in FIG.11 (b) is the value averaged over time.

第一状態を維持すると、全部又は下流側の一部を液相域の冷媒が流れる結露抑制器５３の下流側、すなわち他端近傍（領域Ｃ）は低温になりやすく、結露が発生し易くなる。これに対し、第二状態に切換えて冷媒の流れる向きを変更することで、気液二相域又は液相域の上流側で、比較的温度が高い冷媒（温度ＴＣ２）を領域Ｃに流入させることができる。このとき、図１１（ａ）に例示するように、領域Ａには液相域の冷媒（温度ＴＡ１＜ＴＣ２）が流れるようになる。第一状態と第二状態とを、例えば交互に略等しい時間実行すると、図１１（ｂ）に例示するように、第一状態及び第二状態に比して結露抑制器５３の温度分布が均一化される。 When the first state is maintained, the refrigerant on the downstream side of the condensation suppressing device 53 through which the refrigerant in the liquid phase region flows in the whole or a part on the downstream side, that is, the vicinity of the other end (region C) tends to be low temperature, and condensation easily occurs . On the other hand, by switching to the second state and changing the flow direction of the refrigerant, the refrigerant (temperature TC2) having a relatively high temperature is made to flow into the area C upstream of the gas-liquid two-phase area or the liquid phase area. be able to. At this time, as illustrated in FIG. 11A, the refrigerant (temperature TA1 <TC2) in the liquid phase region flows in the region A. If the first state and the second state are executed alternately, for example, for substantially the same time, the temperature distribution of the dew condensation suppressor 53 is uniform as compared to the first state and the second state as illustrated in FIG. Be

流路切換え弁４８の切換状態がどちらの場合でも、前記したように、結露抑制器５３の上流側は結露を効果的に抑制できるよう加熱し易くなっており、下流側は熱侵入量を抑制できるよう加熱を抑制している。一方、第一状態と第二状態との切換を繰り返すことで、結露抑制器５３の温度の時間平均の分布が、各点で露点温度を超えるようにできる。また、例えば第一状態で比較的高い温度の冷媒で加熱している上流側（領域Ａ）も、第二状態に切換えることで加熱を抑制でき、同様に第二状態で比較的高い温度の冷媒で加熱している上流側（領域Ｃ）も、第一状態に切換えることで加熱を抑制できる。よって、結露抑制器５３の上流側も下流側も、結露を抑制しながら、熱侵入量を抑制することができる。 As described above, regardless of the switching state of the flow path switching valve 48, the upstream side of the condensation suppressor 53 is easily heated so that condensation can be effectively suppressed, and the downstream side suppresses the amount of heat penetration. Heating is suppressed so that it can be done. On the other hand, by repeating switching between the first state and the second state, the distribution of the time average of the temperature of the dew condensation suppressor 53 can be made to exceed the dew point temperature at each point. Also, for example, the upstream side (region A) heated with the relatively high temperature refrigerant in the first state can also suppress the heating by switching to the second state, and similarly the relatively high temperature refrigerant in the second state The heating can be suppressed by switching to the first state also on the upstream side (region C) that is heating in the above. Therefore, the amount of heat penetration can be suppressed while suppressing condensation on both the upstream side and the downstream side of the condensation suppressing device 53.

第一状態と第二状態を切換えるタイミングは、例えば、圧縮機２４が止まって冷媒による加熱が行えずに結露しやすい、冷却運転中の圧縮機２４の停止や、冷却器１４の除霜運転の直前などのあらかじめ決めた時に実行することができる。具体的には、例えば、冷凍室温度センサ４２が温度TFになった場合に圧縮機２４を停止させる冷蔵庫において、冷凍室温度センサ４２が温度（TF＋０．３℃）から（TF＋２．０℃）までの範囲の所定の温度になった場合，例えば温度TFよりも約０．９℃高温になった場合に第一状態と第二状態を切換える。また、例えば、冷却器１４の除霜運転開始１０分前から６０分前までの所定の時間，例えば除霜運転開始３０分前に第一状態と第二状態を切換える。 The timing at which the first state and the second state are switched is, for example, the stop of the compressor 24 during the cooling operation or the defrosting operation of the cooler 14 because the compressor 24 stops and heating by the refrigerant is likely to occur. It can be executed at a predetermined time such as immediately before. Specifically, for example, in a refrigerator in which the compressor 24 is stopped when the freezer compartment temperature sensor 42 reaches the temperature TF, the freezer compartment temperature sensor 42 ranges from the temperature (TF + 0.3 ° C.) to (TF + 2.0 ° C.) The first state and the second state are switched, for example, when the temperature becomes approximately 0.9 ° C. higher than the temperature TF. Also, for example, the first state and the second state are switched between a predetermined time from 10 minutes to 60 minutes before the start of the defrosting operation of the cooler 14, for example, 30 minutes before the start of the defrosting operation.

また、各状態を１０分から６０分までの範囲の所定の時間続けた場合、すなわち時間により、第一状態と第二状態を切換えることもできる。例えば，第一の状態を２０分行うと第二の状態に切換え，第二の状態を２０分行うと第一の状態に切換える。 Also, when each state is continued for a predetermined time ranging from 10 minutes to 60 minutes, that is, the first state and the second state can be switched depending on the time. For example, when the first state is performed for 20 minutes, the state is switched to the second state, and when the second state is performed for 20 minutes, the state is switched to the first state.

また、第一状態と第二状態に優先順位を設けることもできる。例えば、冷却運転中は基本的に第一状態とし、前記した圧縮機２４停止直前や除霜運転直前のみは第二状態にすることができる。また、例えば、圧縮機２４の駆動直後は常に第一状態から開始するようにすることができる。時間により切換える場合も，例えば，第一状態を３０分，第二状態を１０分と，第一状態の方が切換えるまでの時間を長くすることもできる。 Also, the first state and the second state can be prioritized. For example, during the cooling operation, the first state can basically be set, and the second state can be set only immediately before the stop of the compressor 24 or just before the defrosting operation. Also, for example, immediately after driving of the compressor 24, it is possible to always start from the first state. When switching by time, for example, the first state can be 30 minutes, the second state can be 10 minutes, and the time until the first state is switched can be extended.

また、結露抑制器５３の下流側の仕切カバー３６に温度センサをそれぞれ１つ又は２つ以上設けて（図示なし）、所定の温度以下になった時に切換えても良い。温度センサや湿度センサは、それぞれ、結露抑制器５３の一端ｄ及び他端ｆの一方又は両方に設けると好ましい。また、結露抑制器５３の略中間部分に設けても良い。 Alternatively, one or two or more temperature sensors may be provided on the downstream side partition cover 36 of the condensation suppressing device 53 (not shown), and switching may be performed when the temperature falls below a predetermined temperature. The temperature sensor and the humidity sensor are preferably provided on one or both of the one end d and the other end f of the dew condensation suppressor 53, respectively. In addition, it may be provided at a substantially middle portion of the dew condensation suppressor 53.

また、例えばヒンジカバー１６に温度センサ及び湿度センサを設けて外気の温度・湿度を測定し、第一状態の実行中、結露抑制器５３の他端近傍の温度が露点温度以下になったことを検知した後に第二状態に切換えるようにできる。同様に第二状態の実行中、結露抑制器５３の一端近傍の温度が露点温度以下になったことを検知した後に第一状態に切換えるようにできる。これらの場合の切換は、露点温度以下となったことを検知してから、滴下するまでの時間を考慮して、例えば検知直後、２０分、３０分、４０分又は５０分のうち、何れかを下限とし他のいずれかを上限として行っても良い。なお、露点温度以下になってから結露が成長する時間を考慮すると、上限は２０分又は３０分が好ましい。 Further, for example, a temperature sensor and a humidity sensor are provided on the hinge cover 16 to measure the temperature and humidity of the outside air, and during execution of the first state, the temperature near the other end of the condensation suppressing device 53 becomes below the dew point temperature It is possible to switch to the second state after detection. Similarly, during execution of the second state, it is possible to switch to the first state after detecting that the temperature near one end of the dew condensation suppressor 53 has become equal to or lower than the dew point temperature. Switching in these cases is, for example, 20 minutes, 30 minutes, 40 minutes or 50 minutes immediately after the detection, taking into consideration the time until dropping, after detecting that the temperature is lower than the dew point temperature. The lower limit may be set as the lower limit and the other upper limit may be set. The upper limit is preferably 20 minutes or 30 minutes in consideration of the time during which condensation grows after reaching the dew point temperature or lower.

本実施例によれば、結露抑制器５３の両側（領域Ａ及び領域Ｃ）の温度低下を抑制して結露を抑制できる。また、冷媒の向きを切換えることで、結露抑制器５３の何れかの部分が他の部分に比して大きく高温になることを抑制し、庫内への熱の侵入量を低減できる。 According to the present embodiment, it is possible to suppress the dew condensation by suppressing the temperature decrease of both sides (the area A and the area C) of the condensation suppressing device 53. In addition, by switching the direction of the refrigerant, it is possible to suppress that the temperature of one portion of the condensation suppressing device 53 becomes large compared to the other portions, and the amount of heat penetration into the storage can be reduced.

実施例２について説明する。実施例２の構成は、以下の点を除き、実施例１と同様にできる。
図１２は実施例２の冷凍サイクルの構成を示す図である。本実施例の流路切換え弁４３は、第一状態及び第二状態に加え、結露抑制器５３に冷媒を流さずにバイパスさせる第三状態が可能である。従って、開口縁の過熱を抑制できる。 Example 2 will be described. The configuration of the second embodiment can be the same as that of the first embodiment except for the following points.
FIG. 12 is a diagram showing the configuration of the refrigeration cycle of the second embodiment. In addition to the first state and the second state, the flow path switching valve 43 of the present embodiment is capable of a third state in which the condensation suppressing device 53 is bypassed without flowing the refrigerant. Therefore, overheating of the opening edge can be suppressed.

図１２（ａ）は第一状態を示す図である。第三の放熱器５２に接続したパイプ５６の他端は、流路切換え弁４３の入口側の開口６０に接続している。流路切換え弁４３の内部には、弁座６５と弁体６４を備えている。弁座６５にはパイプ５６、５７、５８、５９それぞれと接続している開口６０、６１、６２、６３を設けてある。第一状態では、開口６０から流路切換え弁４３の内部に流入した冷媒は、開口６１を通過して流路切換え弁４３からパイプ５７に流出する。パイプ５７、結露抑制器５３の一端側から他端側、パイプ５８の順に冷媒が流れた後、パイプ５８に接続している開口６２から再び流路切換え弁６４の内部に冷媒が流入する。流路切換え弁４３の内部に流入した冷媒は、溝８０によって開口６２と開口６３が連通されることになり、開口６３に接続されたパイプ５９に流出する。 FIG. 12A is a diagram showing a first state. The other end of the pipe 56 connected to the third radiator 52 is connected to the opening 60 on the inlet side of the flow path switching valve 43. Inside the flow path switching valve 43, a valve seat 65 and a valve body 64 are provided. The valve seat 65 is provided with openings 60, 61, 62, 63 connected to the pipes 56, 57, 58, 59 respectively. In the first state, the refrigerant flowing from the opening 60 into the flow path switching valve 43 passes through the opening 61 and flows out of the flow path switching valve 43 into the pipe 57. After the refrigerant flows in the order of the pipe 57, the one end side to the other end side of the condensation suppressing device 53, and the pipe 58, the refrigerant flows into the flow path switching valve 64 again from the opening 62 connected to the pipe 58. The refrigerant flowing into the flow path switching valve 43 communicates with the opening 62 and the opening 63 by the groove 80 and flows out to the pipe 59 connected to the opening 63.

図１２（ｂ）は第三状態を示す図である。弁体６４を回転させて開口６０と開口６３を連通させると、開口６０から流路切換え弁４３の内部に流入した冷媒は、開口６３に接続しているパイプ５９に流出する。このため、冷媒が結露抑制器５３に流れることを抑制できる。 FIG. 12 (b) shows the third state. When the valve body 64 is rotated and the opening 60 and the opening 63 are communicated, the refrigerant flowing from the opening 60 into the flow path switching valve 43 flows out to the pipe 59 connected to the opening 63. Therefore, the refrigerant can be suppressed from flowing to the condensation suppressor 53.

図１２（ｃ）は第二状態を示す図である。弁体６４を回転させて所定の位置に固定すると、開口６０から流路切換え弁４３の内部に流入した冷媒は、開口６２に接続しているパイプ５８から流出して、結露抑制器５３の他端から一端に向けて流れる。結露抑制器５３に接続したパイプ５７を冷媒が通過した後、開口６１から流路切換え弁４３の内部に流入する。流路切換え弁４３の内部に流入した冷媒は、溝８１によって開口６１と開口６３が連通されることになり、開口６３に接続されたパイプ５９から流出する。 FIG. 12C is a diagram showing a second state. When the valve body 64 is rotated and fixed at a predetermined position, the refrigerant flowing into the flow path switching valve 43 from the opening 60 flows out of the pipe 58 connected to the opening 62, It flows from one end to one end. After the refrigerant passes through the pipe 57 connected to the condensation suppressing device 53, the refrigerant flows into the flow path switching valve 43 from the opening 61. The refrigerant flowing into the flow path switching valve 43 is communicated with the opening 61 and the opening 63 by the groove 81 and flows out from the pipe 59 connected to the opening 63.

図１３は開口縁温度の経時変化の一例である。結露抑制器５３に冷媒を流して開口縁を加熱する第一状態及び第二状態を加熱運転と呼ぶ。結露抑制器５３をバイパスさせる第三状態を非加熱運転と呼ぶ。本実施例では、予め決められた加熱運転と非加熱運転の時間に応じて状態を繰り返し切換える制御を行う。これにより、開口縁の表面平均温度を実施例１の場合に比べて低くできる。このため、庫内への熱侵入をより抑えられる。 FIG. 13 shows an example of the change in opening edge temperature with time. The first state and the second state in which the refrigerant is supplied to the condensation suppressing device 53 to heat the opening edge are referred to as a heating operation. The third state in which the dew condensation suppressor 53 is bypassed is referred to as non-heating operation. In this embodiment, control is performed to repeatedly switch the state according to the predetermined heating operation and non-heating operation time. Thereby, the surface average temperature of the opening edge can be lowered compared to the case of the first embodiment. For this reason, it is possible to further suppress heat penetration into the refrigerator.

図１４は結露抑制器５３の加熱制御のイメージ図であり、横軸は相対湿度、縦軸は結露抑制器５３による加熱割合である。例えば、相対湿度が高いＲＨ２の場合、開口縁の表面で結露する可能性が高くなるので、結露抑制器５３側に冷媒を流す時間（tＡ２）の割合を長く、結露抑制器５３のバイパス側に冷媒を流す時間（tＢ２）の割合を短くする。反対に湿度が低いＲＨ１の場合、開口縁の表面で結露する可能性が低くなるので、結露抑制器５３側に冷媒を流す時間の割合（tＡ１）を短く、結露抑制器５３のバイパス側に冷媒を流す時間の割合（tＢ１）を長くすると良い。 FIG. 14 is an image diagram of heating control of the dew condensation suppressor 53, the horizontal axis is relative humidity, and the vertical axis is the heating ratio by the dew condensation suppressor 53. As shown in FIG. For example, in the case of RH2 where the relative humidity is high, there is a high possibility of condensation on the surface of the opening edge, so the ratio of the time (tA2) for flowing the refrigerant to the condensation suppressor 53 side is long and the bypass side of the condensation suppressor 53 is The proportion of time (tB2) for flowing the refrigerant is shortened. On the other hand, in the case of RH1 where the humidity is low, the possibility of condensation on the surface of the opening edge is reduced, so the proportion (tA1) of the time for flowing the refrigerant to the condensation suppressor 53 side is shortened and the refrigerant on the bypass side of the condensation suppressor 53 It is good to lengthen the ratio (tB1) of flowing time.

加熱運転と非加熱運転の制御は、実施例１と同様に冷蔵庫１に設けた庫外温度センサ３７、庫外湿度センサ３８で得られた冷蔵庫周囲の温度と湿度によって制御できる。開口縁に温湿度センサを取り付け、その検出温湿度に応じて開口縁に結露が生じないように、流路切換え弁４３によって切換え制御を行えば良い。設置スペースの問題や、開口縁と接触するドアパッキンとの干渉による熱侵入量の増加が懸念される場合は、庫外温度センサ３７、庫外湿度センサ３８を冷蔵庫１の天井面に設けても良い。 The control of the heating operation and the non-heating operation can be controlled by the temperature and humidity around the refrigerator obtained by the outside temperature sensor 37 and the outside humidity sensor 38 provided in the refrigerator 1 as in the first embodiment. A temperature / humidity sensor may be attached to the opening edge, and switching control may be performed by the flow path switching valve 43 so that condensation does not occur on the opening edge according to the detected temperature / humidity. If there is a concern about the problem of installation space or an increase in the amount of heat penetration due to interference with the door packing that contacts the opening edge, the outside temperature sensor 37 and outside humidity sensor 38 may be provided on the ceiling surface of the refrigerator 1 good.

実施例３について説明する。実施例３の構成は、以下の点を除き、実施例２と同様にできる。
図１５は冷凍サイクルの構成図である。本実施例の冷凍サイクルは、第一乃至第三状態に加えて、減圧部６７と減圧部７３を切換え可能である。 Example 3 will be described. The configuration of the third embodiment can be the same as that of the second embodiment except for the following points.
FIG. 15 is a block diagram of a refrigeration cycle. In the refrigeration cycle of this embodiment, the pressure reducing portion 67 and the pressure reducing portion 73 can be switched in addition to the first to third states.

庫内の熱負荷が小さい場合、例えばドア２−６の開閉が少ない場合は、圧縮機２４を低速運転とし、それに応じて減圧量が大きい減圧部７３を選択すると省エネルギー性が向上する。一方、庫内の熱負荷が大きい場合、例えば冷蔵庫１に保存する食品を一度にたくさん入れた場合は、圧縮機２４を高速運転とし、減圧量が小さい減圧部６７を選択して、高い冷却性能を発揮させるとよい。 When the heat load in the storage is small, for example, when the opening and closing of the door 2-6 is small, the compressor 24 is operated at a low speed, and accordingly, the pressure reducing portion 73 having a large pressure reducing amount is selected to improve energy saving. On the other hand, when the heat load in the storage is large, for example, when a large amount of food is stored in the refrigerator 1 at one time, the compressor 24 is operated at high speed and the pressure reducing portion 67 having a small pressure reducing amount is selected to achieve high cooling performance. It is good to make

第三の放熱器５２に接続したパイプ５６の他端は、流路切換え弁４７の入口側の開口８２に接続している。流路切換え弁４７の内部には、弁座９０と弁体８９を備えている。弁座９０にはパイプ５６、５７、５８、９１、９２と対応して接続している開口８２、８３、８５、８４、８６をそれぞれ設けてある。流路切換え弁４７は、パイプ５６、５７、５８、９１、９２を接続する５つの開口８２−８６を有する五方弁である。 The other end of the pipe 56 connected to the third radiator 52 is connected to the opening 82 on the inlet side of the flow path switching valve 47. Inside the flow path switching valve 47, a valve seat 90 and a valve body 89 are provided. The valve seat 90 is provided with openings 82, 83, 85, 84, 86 respectively corresponding to the pipes 56, 57, 58, 91, 92, respectively. The flow path switching valve 47 is a five-way valve having five openings 82 to 86 connecting the pipes 56, 57, 58, 91, 92.

図１６，図１７は冷凍サイクルの各切換状態を示す構成図である。図１６（ａ）、（ｂ）、（ｃ）はそれぞれ、減圧部７３を選択した上で、その他は実施例１の第二状態と同様に冷媒を流す強第二状態、第三状態と同様に冷媒を流す強第三状態、第一状態と同様に冷媒を流す強第一状態である。これらをまとめて強状態と呼ぶ。 FIG. 16 and FIG. 17 are configuration diagrams showing each switching state of the refrigeration cycle. 16 (a), (b) and (c) select the pressure reducing portion 73, respectively, and the others are the same as in the second and third states in which the refrigerant flows in the same manner as in the second state of the first embodiment. In the strong third state in which the refrigerant flows, the strong first state in which the refrigerant flows in the same manner as the first state. These are collectively called the strong state.

図１７（ａ）、（ｂ）、（ｃ）はそれぞれ、減圧部６７を選択した上で、その他は実施例１の第二状態と同様に冷媒を流す弱第二状態、第三状態と同様に冷媒を流す弱第三状態、第一状態と同様に冷媒を流す弱第一状態である。これらをまとめて弱状態と呼ぶ。 17 (a), (b) and (c) respectively select the pressure reducing portion 67, and the others are the same as in the second and third states where the refrigerant flows in the same manner as in the second state of the first embodiment. In the weak third state in which the refrigerant flows, the weak first state in which the refrigerant flows similarly to the first state. These are collectively called weak states.

強第二状態では、パイプ５６を通過した冷媒は開口８２から流路切換え弁４７の内部に流入し、開口８５を通過して流路切換え弁４７からパイプ５８に流出する。パイプ５８に接続した結露抑制器５３を領域Ｃ側から冷媒が流れた後、結露抑制器５３の他端に接続したパイプ５７を通過し、パイプ５７の他端に接続している開口８３から再び流路切換え弁４７の内部に冷媒が流入する。流路切換え弁４７の内部に流入した冷媒は、溝８８よって開口８３と開口８６が連通されることになり、開口８６に接続されたパイプ９２から流出する。パイプ９２の他端にはドライヤ６６が接続されており、前記ドライヤ６６の他端には、減圧部７３、パイプ６８、冷却器１４を順に接続してある。 In the strong second state, the refrigerant having passed through the pipe 56 flows into the flow path switching valve 47 through the opening 82, passes through the opening 85, and flows out of the flow path switching valve 47 into the pipe 58. After the refrigerant flows from the area C side to the condensation suppressing device 53 connected to the pipe 58, the refrigerant passes through the pipe 57 connected to the other end of the condensation suppressing device 53, and again from the opening 83 connected to the other end of the pipe 57 The refrigerant flows into the flow path switching valve 47. The refrigerant flowing into the flow path switching valve 47 is communicated with the opening 83 and the opening 86 by the groove 88 and flows out of the pipe 92 connected to the opening 86. A dryer 66 is connected to the other end of the pipe 92, and a decompression unit 73, a pipe 68, and a cooler 14 are connected to the other end of the dryer 66 in order.

強第三状態では、パイプ５６を通過した冷媒は開口８２から流路切換え弁４７の内部に流入し、開口８６を通過して流路切換え弁４７からパイプ９２に流出するので、結露抑制器５３をバイパスさせることができる。 In the strong third state, the refrigerant having passed through the pipe 56 flows into the inside of the flow path switching valve 47 from the opening 82, and flows out from the flow path switching valve 47 into the pipe 92 through the opening 86. Can be bypassed.

強第一状態では、パイプ５６を通過した冷媒は開口８２から流路切換え弁４７の内部に流入し、開口８３を通過して流路切換え弁４７からパイプ５７に流出する。パイプ５７に接続した結露抑制器５３の領域Ａ側から冷媒が流れた後、結露抑制器５３の他端に接続したパイプ５８を通過し、パイプ５８の他端に接続している開口８５から再び流路切換え弁４７の内部に冷媒が流入する。流路切換え弁４７の内部に流入した冷媒は、溝８７よって開口８５と開口８６が連通されることになり、開口８６に接続されたパイプ９２から流出する。 In the strong first state, the refrigerant that has passed through the pipe 56 flows into the inside of the flow path switching valve 47 through the opening 82, passes through the opening 83, and flows out of the flow path switching valve 47 into the pipe 57. After the refrigerant flows from the area A side of the condensation suppressing device 53 connected to the pipe 57, the refrigerant passes through the pipe 58 connected to the other end of the condensation suppressing device 53, and again from the opening 85 connected to the other end of the pipe 58 The refrigerant flows into the flow path switching valve 47. The refrigerant flowing into the flow path switching valve 47 communicates with the opening 85 and the opening 86 by the groove 87 and flows out of the pipe 92 connected to the opening 86.

弱第二状態では、パイプ５６を通過した冷媒は開口８２から流路切換え弁４７の内部に流入し、開口８５を通過して流路切換え弁４７からパイプ５８に流出する。パイプ５８に接続した結露抑制器５３の領域Ｃ側から冷媒が流れた後、結露抑制器５３の他端に接続したパイプ５７を通過し、パイプ５７の他端に接続している開口８３から再び流路切換え弁４７の内部に冷媒が流入する。流路切換え弁４７の内部に流入した冷媒は、溝８８よって開口８３と開口８４が連通されることになり、開口８４に接続されたパイプ９１から流出する。パイプ９１の他端にはドライヤ６６を接続し、前記ドライヤ６６の他端には、減圧部６７、パイプ６８、冷却器１４が順に接続されている。 In the weak second state, the refrigerant having passed through the pipe 56 flows into the flow path switching valve 47 through the opening 82, passes through the opening 85, and flows out of the flow path switching valve 47 into the pipe 58. After the refrigerant flows from the region C side of the condensation suppressing device 53 connected to the pipe 58, the refrigerant passes through the pipe 57 connected to the other end of the condensation suppressing device 53, and again from the opening 83 connected to the other end of the pipe 57 The refrigerant flows into the flow path switching valve 47. The refrigerant flowing into the flow path switching valve 47 communicates with the opening 83 and the opening 84 by the groove 88 and flows out from the pipe 91 connected to the opening 84. A dryer 66 is connected to the other end of the pipe 91, and a decompression unit 67, a pipe 68, and a cooler 14 are connected to the other end of the dryer 66 in order.

弱第三状態では、パイプ５６を通過した冷媒は開口８２から流路切換え弁４７の内部に流入し、開口８４を通過して流路切換え弁４７からパイプ９１に流出するので、結露抑制器５３をバイパスさせることができる。 In the weak third state, the refrigerant having passed through the pipe 56 flows into the inside of the flow path switching valve 47 from the opening 82 and flows out of the flow path switching valve 47 into the pipe 91 through the opening 84. Can be bypassed.

弱第一状態では、パイプ５６を通過した冷媒は開口８２から流路切換え弁４７の内部に流入し、開口８３を通過して流路切換え弁４７からパイプ５７に流出する。パイプ５７に接続した結露抑制器５３の領域Ａ側から冷媒が流れた後、結露抑制器５３の他端に接続したパイプ５８を通過し、パイプ５８の他端に接続している開口８５から再び流路切換え弁４７の内部に冷媒が流入する。流路切換え弁４７の内部に流入した冷媒は、溝８７よって開口８５と開口８４が連通されることになり、開口８４に接続されたパイプ９１から流出する。 In the weak first state, the refrigerant having passed through the pipe 56 flows into the inside of the flow path switching valve 47 from the opening 82, passes through the opening 83 and flows out of the flow path switching valve 47 into the pipe 57. After the refrigerant flows from the area A side of the condensation suppressing device 53 connected to the pipe 57, the refrigerant passes through the pipe 58 connected to the other end of the condensation suppressing device 53, and again from the opening 85 connected to the other end of the pipe 58 The refrigerant flows into the flow path switching valve 47. The refrigerant flowing into the flow path switching valve 47 communicates with the opening 85 and the opening 84 by the groove 87 and flows out from the pipe 91 connected to the opening 84.

強第一状態を実行すると、上述したように、より上流側で液相域に至る。また、機械室ファン５４の回転数を上げて第一の放熱器５０の放熱性能を向上させる場合も、同様に液相域が拡大する。 When the strong first state is executed, as described above, the liquid phase region is reached more upstream. Further, also in the case where the heat radiation performance of the first radiator 50 is improved by increasing the rotational speed of the machine room fan 54, the liquid phase region is similarly expanded.

上述したように、庫内の熱負荷が小さい場合に強状態を実行すると省エネルギー性能を向上できる。また、庫内の熱負荷が大きい場合に弱状態を実行すると同様の効果が得られる。強運転、弱運転共に、第一状態と第二状態を切換えるタイミングは、実施例１と同様にできる。 As described above, when the heat load in the refrigerator is small, the energy saving performance can be improved by executing the strong state. In addition, when the heat load in the storage is large, the same effect can be obtained by executing the weak state. The timing at which the first state and the second state are switched in both the strong operation and the weak operation can be the same as in the first embodiment.

［まとめ］
以上、本発明の例示である各実施形態において、流路切換え弁の切換操作を通じて、結露抑制器の一端側から他端側に流れる第一状態と、他端側から一端側に流れる第二状態とを実現できる。この際、第一状態及び第二状態の何れにおいても、放熱器、結露抑制器、減圧部の順に冷媒を流すことができる。これにより、結露抑制器を流れる冷媒温度が高くなり過ぎることを抑制し、省エネ性を改善できる。 [Summary]
As mentioned above, in each embodiment which is an illustration of the present invention, the 1st state which flows from the one end side to the other end side of a condensation control, and the 2nd state which flows from the other end side to the one end side Can be realized. Under the present circumstances, also in any of a 1st state and a 2nd state, a refrigerant | coolant can be flowed in order of a radiator, a condensation suppression apparatus, and a pressure reduction part. Thereby, it can suppress that the refrigerant | coolant temperature which flows through a dew condensation suppression device becomes high too much, and can improve energy saving property.

また、結露抑制器をバイパスさせる第三状態を実行可能な場合は、さらに省エネ性を改善できる。
なお、第一状態及び第二状態は、放熱器、結露抑制器、減圧部それぞれの間に他の構成要素が存在することを必ずしも除外するものではなく、放熱器、結露抑制器、減圧部という３つの構成要素について、冷媒が流れる順番が、上記の通りであればよい。第三状態もまた、放熱器及び減圧部の間に他の構成要素が存在することを必ずしも除外するものではない。 In addition, when it is possible to execute the third state in which the dew condensation suppressor is bypassed, energy saving can be further improved.
The first state and the second state do not necessarily exclude the presence of other components between the radiator, the condensation suppressor, and the pressure reducing unit, respectively, and are referred to as a radiator, a condensation suppressor, and a pressure reducing unit. The order in which the refrigerant flows may be as described above for the three components. The third state also does not necessarily exclude the presence of other components between the radiator and the pressure reducing portion.

１冷蔵庫
２冷蔵室（冷蔵温度帯の貯蔵室）
２ａ、２ｂ冷蔵室ドア
３製氷室
３ａ製氷室ドア
３ｂ収納容器
４上段冷凍室
４ａ上段冷凍室ドア
４ｂ収納容器
５下段冷凍室
５ａ下段冷凍室ドア
５ｂ収納容器
６野菜室
６ａ野菜室ドア
６ｂ収納容器
７冷凍室（冷凍温度帯の貯蔵室）
８冷却器収納室
９ファン
１０断熱箱体
１０ａ外箱
１０ｂ内箱
１１冷蔵室冷気ダクト
１１ａ、１１ｂ、１１ｃ冷蔵室冷気吐出口
１２上段冷凍室冷気ダクト
１２ａ吐出口
１３下段冷凍室冷気ダクト
１３ａ、１３ｂ吐出口
１４冷却器
１５カバー
１６ヒンジカバー
１７冷凍室冷気戻り部
１８野菜室冷気戻りダクト
１８ａ野菜室側の冷気戻り部
１８ｂ野菜室冷気戻り部
１９ヒータ
２０冷蔵室ダンパ
２０ａバッフル
２１冷凍室ダンパ
２１ａバッフル
２２ラジアントヒータ
２３樋
２４圧縮機
２５真空断熱材
２６操作部
２７ドレン孔
２８、２９断熱仕切り壁
３０基板カバー
３１制御基板
３２蒸発皿
３３ａ、３３ｂ、３３ｃドアポケット
３４ａ、３４ｂ、３４ｃ、３４ｄ棚
３５貯蔵室
３６ａ、３６ｂ、３６ｃ、３６ｄ仕切りカバー
３７庫外温度センサ
３８庫外湿度センサ
３９機械室
４０断熱仕切壁
４１冷蔵室温度センサ（冷蔵室温度）
４２冷凍室温度センサ（冷凍室温度）
４３流路切換え弁（四方弁）
４４熱の流れ（庫外側）
４５熱の流れ（庫内側）
４６断熱仕切り壁
４７流路切換え弁（五方弁）
４８流路切換え弁（冷媒逆転弁）
５０第一の放熱器
５１第二の放熱器
５２第三の放熱器
５３結露抑制器
５４機械室ファン
５５、５６、５７、５８、５９パイプ
６０、６１、６２、６３開口
６４弁体
６５弁座
６６ドライヤ
６７減圧部（第一の減圧部）
６８パイプ
６９熱交換部
７０パイプ
７１気相成分
７２液相成分
７３減圧部（第二の減圧部）
７４、７５、７６、７７開口
７８弁体
８０、８１溝
８２、８３、８４、８５、８６開口
８７、８８溝
８９弁体
９０弁座
９１、９２パイプ
９３、９４、９５、９６内部流路 1 refrigerator 2 cold storage room (storage room of cold storage temperature zone)
2a, 2b Cold storage door 3 Ice making room 3a Ice making door 3b Storage container 4 Upper freezing room 4a Upper freezing room door 4b Storage container 5 Lower freezing room 5a Lower freezing room door 5b Storage vessel 6 Vegetable room 6a Vegetable room door 6b Storage vessel 7 Freezer room (storage room of frozen temperature zone)
8 cooler storage room 9 fan 10 heat insulation box 10a outer box 10b inner box 11 cold room cold air ducts 11a, 11b, 11c cold room cold air outlet 12 upper freezer compartment cold air duct 12a outlet 13 lower freezer compartment cold air duct 13a, 13b Discharge port 14 Cooler 15 Cover 16 Hinge cover 17 Freezing room cold air return part 18 Vegetable room cold air return duct 18a Cold air returning part 18b for vegetable room side Cooled air room return part 19 Heater 20 cold room damper 20a baffle 21 cold room damper 21a baffle Reference Signs List 22 radiant heater 23 樋 24 compressor 25 vacuum heat insulating material 26 operation part 27 drain hole 28, 29 heat insulating partition wall 30 substrate cover 31 control substrate 32 evaporation plate 33a, 33b, 33c door pocket 34a, 34b, 34c, 34d shelf 35 storage Chamber 36a, 36b, 36c, 36d Partition cover 37 Outside temperature sensor 38 Outside humidity sensor 39 Machine room 40 Heat insulation partition wall 41 Cold storage room temperature sensor (cold storage room temperature)
42 Freezer temperature sensor (Freezer temperature)
43 Flow path switching valve (four-way valve)
44 Heat flow (outside storage)
45 Heat flow (inside)
46 thermal insulation partition wall 47 flow path switching valve (five-way valve)
48 flow path switching valve (refrigerant reverse valve)
DESCRIPTION OF SYMBOLS 50 1st radiator 51 2nd radiator 52 3rd radiator 53 Condensation suppressor 54 Machine room fan 55, 56, 57, 58, 59 Pipe 60, 61, 62, 63 Opening 64 Valve body 65 Valve seat 65 66 Dryer 67 Decompression Unit (First Decompression Unit)
68 pipe 69 heat exchange unit 70 pipe 71 gas phase component 72 liquid phase component 73 pressure reducing unit (second pressure reducing unit)
74, 75, 76, 77 Opening 78 Valve body 80, 81 Groove 82, 83, 84, 85, 86 Opening 87, 88 Groove 89 Valve body 90 Valve seat 91, 92 Pipe 93, 94, 95, 96 Internal flow path

Claims

A compressor for compressing a refrigerant ,
A radiator provided at one or more locations on the machine room, side, top and back of the box,
A condensation suppressor provided at an opening edge of the box body, through which the refrigerant compressed by the compressor flows ;
A channel switching unit,
Decompression section,
A refrigerator comprising a condenser, a refrigeration cycle having,
The flow path switching unit is
A first state in which the refrigerant flows in the order of the radiator, the one end side to the other end side of the condensation suppressor, and the pressure reducing portion in the order
It is possible to execute the second state in which the refrigerant flows in the order of the radiator, the other end side of the condensation suppressor, one end side of the condensation suppressor, and the pressure reducing unit ,
It is possible to execute the defrosting operation of the cooler,
A refrigerator, wherein the defrosting operation is started after switching from the first state to the second state .

Humidity sensor,
Temperature sensors respectively disposed on one end side and the other end side of the dew condensation suppressor;
After detecting that the temperature on the other end side has become equal to or lower than the dew point temperature, the first state is switched to the second state,
The refrigerator according to claim 1 the temperature of the one end after detecting that falls below the dew point temperature, characterized by switch between the from the second state to the first state.

The sum of the lengths of the pipe connecting the flow path switching unit and one end of the condensation suppressor, the condensation reducer, and the pipe connecting the other end of the flow path switching unit and the condensation suppressor is the compression der least 10% of the length of the to the upstream side of the pressure reducing portion from the discharge side of the machine is,
The length of the condensation suppressor is a pipe connecting the flow path switching unit and one end of the condensation suppressor, a pipe connecting the condensation suppressor, and the other end of the flow path switching unit and the condensation suppressor. the refrigerator according to claim 1 or 2, characterized in der Rukoto more than 50% of the sum of the lengths of.

  A compressor for compressing a refrigerant,
  A radiator provided at one or more locations on the machine room, side, top and back of the box,
  A condensation suppressor provided at an opening edge of the box body, through which the refrigerant compressed by the compressor flows;
  A channel switching unit,
  A refrigerator comprising: a refrigeration cycle having a pressure reducing section;
  The flow path switching unit is
  A first state in which the refrigerant flows in the order of the radiator, the one end side to the other end side of the condensation suppressor, and the pressure reducing portion in the order;
  It is possible to execute the second state in which the refrigerant flows in the order of the radiator, the other end side of the condensation suppressor, one end side of the condensation suppressor, and the pressure reducing unit,
  Humidity sensor,
  Temperature sensors respectively disposed on one end side and the other end side of the dew condensation suppressor;
  After detecting that the temperature on the other end side has become equal to or lower than the dew point temperature, the first state is switched to the second state,
  After detecting that the temperature at the one end side has become equal to or lower than the dew point temperature, the refrigerator is switched from the second state to the first state.

  A compressor for compressing a refrigerant,
  A radiator provided at one or more locations on the machine room, side, top and back of the box,
  A condensation suppressor provided at an opening edge of the box body, through which the refrigerant compressed by the compressor flows;
  A channel switching unit,
  A refrigerator comprising: a refrigeration cycle having a pressure reducing section;
  The flow path switching unit is
  A first state in which the refrigerant flows in the order of the radiator, the one end side to the other end side of the condensation suppressor, and the pressure reducing portion in the order;
  It is possible to execute the second state in which the refrigerant flows in the order of the radiator, the other end side of the condensation suppressor, one end side of the condensation suppressor, and the pressure reducing unit,
  The refrigerator is basically in the first state during the cooling operation, and is switched to the second state immediately before stopping the compressor.