JP2016205669A

JP2016205669A - refrigerator

Info

Publication number: JP2016205669A
Application number: JP2015085568A
Authority: JP
Inventors: 大平　昭義; Akiyoshi Ohira; 昭義大平; 慎一郎岡留; Shinichiro Okadome; 利広小松; Toshihiro Komatsu; 康仁福井; Yasuhito Fukui; 山下　太一郎; Taichiro Yamashita; 太一郎山下
Original assignee: Hitachi Appliances Inc
Current assignee: Hitachi Appliances Inc
Priority date: 2015-04-20
Filing date: 2015-04-20
Publication date: 2016-12-08
Anticipated expiration: 2035-04-20
Also published as: CN106066110A; CN106066110B; JP6539093B2

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator in which dew condensation suppression performance by a radiator provided at an opening edge of a box body and energy saving performance are improved.SOLUTION: A refrigerator includes a refrigeration cycle which has: a compressor 24; radiators provided at one or more places at a machine room, a side surface, a top surface and a back surface of a box body; a dew condensation suppressor 53 provided at an opening edge of the box body; a flow passage switching valve 48; and a decompression part 67. The flow passage switching valve 48 can execute: a first state in which a refrigerant flows in the radiator, from one end d side to the other f side of the dew condensation suppressor 53, and the decompression part 67 in this order; and a second state in which the refrigerant flows in the radiator, from the other f side to the one end d side of the dew condensation suppressor 53 and the decompression part 67 in this order.SELECTED DRAWING: Figure 10

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 discloses, as a refrigerant switching channel, a first switching state in which the refrigerant flows in the order of “four-way valve 24 → radiation pipe 17 → dew condensation prevention pipe 18” to give priority to energy saving performance, and “four-way valve 24”. The second switching state in which the refrigerant is flowed in the order of “dew prevention pipe 18 → heat radiation pipe 17” to give priority to dew prevention is disclosed (0014, FIGS. 1 and 2). The heat radiating pipe 17 is embedded in the back surface portion of the refrigerator main body 1, and the dew proof pipe 18 is attached to a partition portion located at the peripheral edge portion of the front opening of the storage chambers 2-6 (0010).
In the first switching state, the refrigerant whose temperature has been lowered by the heat radiating pipe 17 can be passed through the dew-proof pipe 18 (0014). In the second switching state, the refrigerant is allowed to flow through the dew prevention pipe 18 by flowing the refrigerant through the dew prevention pipe 18 before the heat radiating 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 Literature 1, the four-way valve 24 can switch whether the heat radiation pipe 17 is ahead or behind the dew-proof pipe 18 in the order in which the refrigerant flows. In the first switching state, the refrigerant radiated by the heat radiating pipe 17 flows into the dew proof pipe 18 and gradually decreases in temperature within the dew proof pipe 18, so the upstream side of the dew proof pipe 18 (the heat radiating 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 hot. On the other hand, since the refrigerant before passing through the heat radiating pipe 17 flows into the dew prevention pipe 18 in the second switching state, the refrigerant on the downstream side (heat radiating pipe 17 side) of the dew prevention pipe 18 is also basically a gas-liquid two-phase. Since it is upstream of the zone or the liquid phase zone, it is a relatively high temperature refrigerant. For this reason, in the case of the first switching state and the second switching state, the heat dissipation pipe 17 side (the upstream side of the first switching state and the downstream side of the second switching state) of the dewproof pipe 18 is compared. Since a high-temperature refrigerant flows, the amount of heat flowing into the warehouse increases, and there is room for improvement in energy saving.

上記課題に鑑みてなされた本発明は、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た結露抑制器と、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、を実行可能なことを特徴とする。 The present invention made in view of the above problems includes a compressor, a radiator provided in one or more places in a machine room, a side surface, a top surface, and a back surface of a box, and a dew condensation suppressor provided at an opening edge of the box. A refrigerator having a refrigeration cycle having a flow path switching unit and a decompression unit, wherein the flow path switching unit is configured such that the one end side to the other end side of the radiator, the dew condensation suppressor, It is possible to execute a first state in which the refrigerant flows in order, and a second state in which the refrigerant flows in the order of the radiator, the other end side of the dew condensation suppressor to the one end side, and the decompression unit.

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AA sectional view of FIG. 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 heat 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Sectional schematic diagram 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 in the heat 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 typically the state of the refrigerant | coolant in the radiator pipe of Example 1 (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 explaining the outline of the temperature distribution of the piping surface which comprises the dew condensation suppressor of Example 1. FIG. 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 combining a 1st state and a 2nd state) 実施例２の冷蔵庫の冷凍サイクルの構成図The block diagram of the refrigerating 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 the 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 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 refrigeration cycle of Example 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 refrigeration cycle of Example 3 (when decompression 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 refrigeration cycle of Example 3 (when decompression 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 accompanying 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 of each other. For example, a plurality of components are formed as a single member, and a single component is formed of a plurality of members. That a certain component is a part of another component and that a certain component and a part of another component overlap.

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 this embodiment, the temperature of the refrigerant flowing through the dew condensation suppressor provided at the opening edge of the front face of the refrigerator box is maintained at a relatively low temperature while suppressing dew condensation, and the temperature of the refrigerant flowing through the dew condensation suppressor The time average of can be made closer. Thereby, the refrigerator which improved 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。 [Refrigerator 1 and opening edge]
FIG. 1 is a front view of the refrigerator 1 according to the first embodiment. The box 10 of the refrigerator 1 has a storage room in the order of a refrigerator compartment 2 from above, an ice making room 3 provided on the left and right, an upper freezer room 4, a lower freezer room 5, and a vegetable room 6. The refrigerator 1 includes a door that opens and closes the opening of each storage chamber. These doors are divided into left and right, and are provided with refrigerating room doors 2a and 2b that open and close the opening of the refrigerating room 2, and the ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 with openings. A drawer-type ice making door 3a, an upper freezer compartment door 4a, a lower freezer compartment door 5a, and a vegetable compartment door 6a that open and close, respectively. Hereinafter, the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5 are collectively referred to as a freezing chamber 7.

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。 In the closed state of the doors 2a, 2b, 3a, 4a, 5a, and 6a, the front end portions of the heat insulating partition walls 28, 40, and 29 of the box 10 that the doors 2a, 2b, 3a, 4a, 5a, and 6a are in contact with, Partition covers 36a, 36b, and 36c are provided, respectively. A partition cover 36 d is also provided in front of the heat insulating partition wall 46 provided on the bottom surface of the refrigerator 1. In the box 10, a portion where the doors 2 a, 2 b, 3 a, 4 a, 5 a, 6 a are in contact with each other in a closed state is called an opening edge, and a partition cover (partition portion) 36 is provided at the 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, and 6a are opened, there is a possibility that dew condensation occurs because the air outside the warehouse contacts the opening. For this reason, piping (condensation suppressor 53) through which refrigerant flows is provided in the openings near these doors. By supplying the hot refrigerant to the dew condensation suppressor 53, dew condensation on the opening edge can be suppressed. The dew condensation suppressor 53 is covered with 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。 2 is a cross-sectional view taken along the line AA in FIG. The refrigerating room 2, the upper freezing room 4 and the ice making room 3 are separated by the heat insulating partition wall 28, and the lower freezing room 5 and the vegetable room 6 are separated by the heat insulating 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 freezing chamber 5, and the cold air exchanged with the cooler 14 is cooled by the fan 9 provided above the cooler 14. It is sent to each storage room of the upper freezer room 4, the lower freezer 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 the refrigerating room cooling operation for cooling the refrigerating room 2, the refrigerating room damper 20 is opened, the freezing room damper 21 is closed, and cold air is sent to the refrigerating room 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 the freezing room cooling operation for cooling the freezing room 7, the refrigerating room damper 20 is closed, the freezing room damper 21 is opened, and cold air is sent to the upper freezing room 4, the lower freezing room 5, and the ice making room 3. The temperature of the refrigerator compartment 2 and the freezer compartment 7 is detected by the refrigerator compartment temperature sensor 41 and the freezer compartment temperature sensor 42 provided in the warehouse, and the refrigerator compartment 2 and the freezer compartment 7 are simultaneously cooled according to the temperature in the warehouse. There is also an operation, and in that case, both the refrigerator compartment damper 20 and the freezer compartment damper 21 are opened, and cool air is blown to each storage compartment.

［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。 [Heatsink 50-52, Condensation suppressor 53]
FIG. 3 is a view showing the arrangement of radiators provided in the refrigerator 1. As the radiator, for example, a pipe through which a 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 in the lower part on the back 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 on a part or all of the opening edge. The second radiator 51 and the third radiator 52 may be arranged along the top surface or the back surface instead of the side surface of the refrigerator 1. Moreover, although it is preferable to provide all the 1st heat radiator 50, the 2nd heat radiator 51, and the 3rd heat radiator 52, what is necessary is just to provide any one or more.

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。 Condensation suppressor 53 is provided in the vicinity of vegetable compartment 6 (region A), in the middle of freezer compartment 5 (region B), and in the vicinity of the upper portion of freezer compartment 7 (region C), and heats the opening edge by heat radiation from the refrigerant. doing. The end portion of the dew condensation suppressor 53 may be considered as a portion where the piping through which the refrigerant flows is separated from the opening edge. In FIG. 3, the refrigerant flows from the machine room 39 side toward the opening edge below the vegetable room 6, passes through the opening edge of the freezer room 7, passes through the opening edge on the side of the freezer room 7 and the vegetable room 6, and then the machine room. The case where it flows toward the 39 side is illustrated. In this case, the dew condensation suppressor 53 is directed to a flow path switching valve 48 through one end of a point d that reaches the opening edge below the vegetable chamber 6 from the pipe 57 described later, and from the opening edge on the side of the vegetable chamber 6 through the pipe 58. The starting point f can be considered as the other end. The dew condensation suppressor 53 is provided including an opening edge that contacts the freezer compartment doors 3a, 4a, and 5a, but an opening edge that contacts the door 6a of the vegetable compartment and the doors 2a and 2b of the kannon-type refrigerator compartment. May be provided. In addition, the number of rooms in the refrigerator compartment or freezer compartment of the refrigerator 1 is not particularly limited. The door type of each storage room may be either a drawer 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 schematic cross-sectional view of the heat insulating partition walls 29 and 40 as an example of the opening edge. A pipe for the dew condensation suppressor 53 is provided so that the doors 3a, 4a, 5a are in contact with or substantially in contact with the partition covers 36b, 36c located in the vicinity. When the refrigerant flows through the dew condensation suppressor 53, the partition covers 36a, 36b, 36c can be heated by the heat 44 to suppress dew condensation. However, the dew condensation suppressor 53 also generates heat 45 that heats the freezer compartment. For this reason, it is preferable to lower the temperature of the refrigerant flowing through the dew condensation suppressor 53 in a temperature range where dew condensation can be suppressed.
Similarly to the heat insulating partition walls 29 and 40, the dew condensation suppressor 53 is also disposed on the partition covers 36a and 36d of the heat insulating partition walls 28 and 46 that are 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。 The side and back of the refrigerator 1 in which the second radiator 51 and the third radiator 52 are disposed may be provided with a heater or the like around it, but the dew condensation suppressor 53 is disposed on the opening side of the box 10. Since it is buried, it is difficult to be affected by a sudden temperature change around the refrigerator 1. By disposing the dew condensation suppressor 53 in the most downstream of the radiator 50-52 and the dew condensation suppressor 53, the temperature of the refrigerant flowing into the decompression unit 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。 [Refrigeration cycle]
FIG. 5 is a schematic diagram of the configuration of the refrigeration cycle. The refrigerator 1 generates cold air by utilizing the circulation of the refrigerant by the refrigeration cycle. A first radiator 50 is connected to a pipe 55 on the discharge side of the compressor 24 that compresses the refrigerant. In order from the first radiator 50, the second radiator 51, the third radiator 52, and the opening 74 of the flow path switching valve 48 are connected. A machine room fan 54 for cooling the first radiator 50 may be provided.

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。 A valve body 78 provided with flow paths 93 and 94 is provided inside the flow path switching valve 48. The flow path switching valve 48 has four openings 74, 75, 76, 77 and a valve body 78. As will be described later, for example, by rotating the valve body 78 with a stepping motor (not shown) or the like, the openings 74 to 77 communicating 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 a first state which will be described later. 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 passing 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 dew condensation suppressor 53 and the flow path switching valve 48. It flows out to the pipe 57. Thereafter, the refrigerant flows from one end d of the dew condensation suppressor 53 to the other end f, passes through the pipe 58 connected to the other end of the dew condensation suppressor 53 and the flow path switching valve 48, and enters the flow path switching valve 48 from the opening 77. Inflow. The refrigerant flowing 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 that has flowed out into the pipe 59 flows into the cooler 14 through the dryer 66, the decompression unit 67, and the pipe 68. Connected to the outlet side of the cooler 14 is a pipe 70 having a heat exchanging portion 69 that is arranged in the vicinity of the pressure reducing portion 67 and can exchange heat with the refrigerant flowing through the pressure reducing portion 67. The refrigerant that has 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 decompression unit 67 decompresses the refrigerant, and various known configurations such as a capillary tube and an expansion valve can be employed. The dew condensation suppressor 53 is provided on the most downstream side among the radiators 50-52 and the dew condensation suppressor 53, and is provided at a position closest to the decompression unit 67 among these.

［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 state inside the first radiator 50 (section ac), the second radiator 51, the third radiator 52 (section cd), and the dew 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, symbol a is the discharge side of the compressor 24, and symbol b is the refrigerant from the gas phase region to the gas-liquid phase. Point c becomes a two-phase region, symbol c is between first radiator 50 and second radiator 51, symbol d is one end of dew condensation suppressor 53, symbol e is a refrigerant from a liquid-gas two-phase region to a 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 flows from the one end d side of the dew condensation suppressor 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 that has been compressed by the compressor 24 to a high temperature and high pressure is a gas phase region composed of the gas phase component 71. The refrigerant is a mixture of the gas phase component 71 and the liquid phase component 72 until it passes through the first to third heat radiators 50-52 to release heat to the outside and reaches one end d of the dew condensation suppressor 53. The pipe length, the rotational 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 region composed of the gas-liquid two-phase region 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 in a gas-liquid two-phase region. Further, it is preferable that the refrigerant flowing through the other end f of the dew condensation suppressor 53 is adjusted so as to be in a liquid phase region. Here, the middle of the first radiator 50 (section ab) is a gas phase region, and the middle of the first radiator 50 to the middle of the dew condensation suppressor 53 (section be) is a gas-liquid two-phase region. Thus, adjustment is performed so that the middle of the dew condensation suppressor 53 to the other end (section ef) is in the liquid phase region. Therefore, in the refrigerant flow of FIG. 5, the temperature of the end portion 53 f on the outflow side is lower than the end portion 53 d on the inflow side of the dew condensation suppressor 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 dew condensation suppressor 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 dew condensation suppressor 53, and the pipe 58, and the dew condensation suppressor 53 flows from one end d toward the other end f. On the other hand, in the second state, the pipe 58, the dew condensation suppressor 53, and the pipe 57 flow in this order, and the dew condensation suppressor 53 flows from the other end f toward the 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 pipe length from the opening 75 to the opening 77, that is, the pipe 57, with respect to the pipe length from the discharge side end (point of symbol a in FIG. 5) of the compressor 24 to the upstream side of the decompression unit 67. The lower limit values of the lengths of the dew condensation suppressor 53 and the pipe 58 can be set to 10%, 15%, 20%, and 25%, for example. When this pipe length is increased, the refrigerant gradually becomes low temperature while flowing through the dew condensation suppressor 53, and the liquid phase refrigerant having a relatively low temperature flows on the downstream side of the dew condensation suppressor 53. The amount of heat penetration into the inside can be suppressed. On the other hand, the upper limit values of the pipe lengths of the pipe 57, the dew condensation suppressor 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 decompression unit 67. %. When this piping length is shortened, the upstream side of the dew condensation suppressor 53 is heated, for example, in a gas-liquid two-phase region or an upstream side of the liquid phase region with a relatively high temperature refrigerant to effectively suppress dew condensation. it can. That is, it is easy to heat the upstream side of the dew condensation suppressor 53 so that dew condensation can be effectively suppressed, and the downstream side suppresses heating so that the heat penetration amount can be suppressed.

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。 Further, the lower limit value of the pipe length of the dew condensation suppressor 53 can be set to, for example, 50%, 65%, and 80% with respect to the pipe lengths of the pipe 57, the dew condensation suppressor 53, and the pipe 58. When the pipe length of the dew condensation suppressor 53 is increased, refrigerant in a gas-liquid two-phase region or a liquid phase region having a relatively high temperature flows on the upstream side of the dew condensation suppressor 53, and a liquid phase region on the downstream side having a relatively low temperature. This makes it easier to obtain the above-described effects. In addition, since the liquid refrigerant having a high density flows through the downstream side of the dew condensation suppressor 53, that is, the pipe 58 in the first state and the pipe 57 in the second state, the pipes 57 and 58 are made relatively short so that the refrigeration cycle can be achieved. The amount of refrigerant to be sealed is suppressed. At this time, the pipe lengths of the pipe 57 and the pipe 58 may be substantially the same or different from each other. However, from the viewpoint of enhancing symmetry in switching between a first state and a second state described later, The same is preferable. By setting the pipe length as described above, the upstream side of the dew condensation prevention pipe 53 is either a gas-liquid two-phase region or a relatively high-temperature liquid phase region in both the first state and the second state described later. Since the refrigerant in the liquid phase region having a relatively low temperature flows on the downstream side, the temperature difference between one end and the other end of the dew condensation suppressor 53 can be increased. Thereby, it is possible to achieve both suppression of condensation and suppression of the amount of heat penetration from the opening edge into the storage chamber. Since the refrigerant flows in a part of the dew condensation suppressor 53 in the liquid phase region, a temperature difference occurs between one end and the other end of the dew condensation suppressor 53. From the viewpoint of coexistence of dew condensation suppression and heat penetration, it is preferable that the temperature difference be 1 ° C. or more.

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 illustrating the state of the refrigerant when the liquid phase region is expanded as compared to the case illustrated in FIG. 6. FIG. 8 is a Mollier diagram illustrating the refrigerant state. 8A corresponds to FIG. 6, and FIG. 8B corresponds to FIG. Points af shown in FIG. 8 correspond to the refrigerant pressure and specific enthalpy at each point af shown in FIG.
For example, when the amount of decompression by the decompression unit 67 is increased, or when the heat radiation performance of the first radiator 50 is improved by operating the machine room fan 54 at a 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 region (section ef) shown in FIG. 6 expands to the liquid phase region (section e ₁ f) shown in FIG. 7, and the liquid phase region occupying the piping of the fourth dew condensation suppressor 53 is increased. become longer. Therefore, the refrigerant temperature starts to decrease from the upstream side of the dew condensation suppressor 53, and the enthalpy of the liquid phase refrigerant at the other end f of the dew condensation suppressor 53 decreases from the point f in FIG. 8A shown in the Mollier diagram. Thus, the point f in FIG. For this reason, the specific enthalpy of the refrigerant flowing into the decompression unit 67 is lower in FIG. 8B than in FIG. Thereby, since the enthalpy difference of the refrigerant | coolant heat-exchanged in the heat exchange part 69 can be enlarged, energy saving performance improves.

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 the outline of the temperature distribution of the dew condensation suppressor 53 (section df). FIG. 9A corresponds to FIG. 6, and FIG. 9B corresponds to FIG.
9 (a) and 9 (b), the refrigerant temperature is kept constant because the upstream side (sections de and de ₁ ) of the dew condensation suppressor 53 is a gas-liquid two-phase region, but the sections ef and e _{Since 1} f is a 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 dew condensation suppressor 53 becomes TC and TC1. In the case of FIG. 9B in which the liquid phase region length in the dew condensation suppressor 53 is increased, the length of the liquid phase region in the pipe of the dew condensation suppressor 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 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 through the dew 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 is a diagram showing a first state in which the refrigerant flows from the region A including the opening edge of the vegetable compartment 6 toward the region C including the opening edge of the freezer compartment 7. FIG. 10B is a diagram illustrating a second state in which the refrigerant flows from the region C toward the region 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 refrigerant flow in the first state is as described above, the refrigerant flow in the second state will be described. In the second state, the valve element 78 provided inside the flow path switching valve 48 is rotated from the first state so that the openings 74 and 77 communicate with the flow path 94 and the openings 75 and 76 communicate with the flow path 93. ing. The refrigerant that has passed through the first to third radiators 50-52 flows into the flow path switching valve 48 from the opening 74, flows out of the pipe 58 connected to the opening 77, and other than the dew condensation suppressor 53. It flows from the region C side which is the end f toward the region A side which is the one end d. Thereafter, the refrigerant passes through the pipe 57 and flows again into the flow path switching valve 43 from the opening 75. The refrigerant flowing 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 showing an outline of the temperature distribution of the dew condensation suppressor 53. FIG. 11A shows the temperature distribution of the refrigerant flowing through the condensation suppressor 53 in the second state, and FIG. 11B shows the refrigerant flowing through the condensation suppressor 53 when the first state and the second state are combined. Temperature distribution. In addition, the temperature distribution of the refrigerant | coolant which flows through the dew condensation suppressor 53 in a 1st state is the same as that of what was shown in FIG.9 (b). Each temperature shown in FIG. 11B is a time averaged value.

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。 If the first state is maintained, all or a part of the downstream side of the dew condensation suppressor 53 through which the refrigerant in the liquid phase region flows, that is, the vicinity of the other end (region C) tends to be low temperature, and dew condensation is likely to occur. . 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 caused to flow into the region C on the upstream side of the gas-liquid two-phase region or the liquid phase region. be able to. At this time, as illustrated in FIG. 11A, the liquid phase region refrigerant (temperature TA1 <TC2) flows through the region A. When the first state and the second state are executed alternately for substantially the same time, for example, as illustrated in FIG. 11B, the temperature distribution of the dew condensation suppressor 53 is uniform compared to the first state and the second state. It becomes.

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。 Regardless of the switching state of the flow path switching valve 48, as described above, the upstream side of the dew condensation suppressor 53 is easy to heat so that dew 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 the switching between the first state and the second state, the time-average distribution of the temperature of the dew condensation suppressor 53 can exceed the dew point temperature at each point. Further, for example, the upstream side (region A) that is heated with a relatively high temperature refrigerant in the first state can also be suppressed by switching to the second state, and similarly, a relatively high temperature refrigerant in the second state. The upstream side (region C) that is being heated at can also be suppressed by switching to the first state. Therefore, the heat penetration amount can be suppressed while suppressing condensation on both the upstream side and the downstream side of the condensation suppressor 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 of switching between the first state and the second state is, for example, when the compressor 24 is stopped and the refrigerant 24 is not heated and is likely to condense, and the compressor 24 is stopped during the cooling operation or the defrosting operation of the cooler 14 is performed. It can be executed at a predetermined time such as immediately before. Specifically, for example, in a refrigerator that stops the compressor 24 when the freezer temperature sensor 42 reaches the temperature TF, the freezer temperature sensor 42 is from temperature (TF + 0.3 ° C.) to (TF + 2.0 ° C.). When the temperature reaches a predetermined temperature in the range of, for example, when the temperature becomes about 0.9 ° C. higher than the temperature TF, the first state and the second state are switched. Further, for example, the first state and the second state are switched for a predetermined time from 10 minutes before the start of the defrosting operation of the cooler 14 to 60 minutes before, 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。 Further, when each state is continued for a predetermined time in a range from 10 minutes to 60 minutes, that is, according to time, the first state and the second state can be switched. 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, priorities can be set for the first state and the second state. For example, the first state can be basically set during the cooling operation, and the second state can be set only before the compressor 24 is stopped or just before the defrosting operation. Further, for example, it is possible to always start from the first state immediately after the compressor 24 is driven. Also in the case of switching according to time, for example, the first state may be 30 minutes, the second state may be 10 minutes, and the time until the first state is switched can be lengthened.

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 more temperature sensors may be provided on the partition cover 36 on the downstream side of the dew condensation suppressor 53 (not shown), and the temperature may be switched when the temperature falls below a predetermined temperature. It is preferable that the temperature sensor and the humidity sensor are provided on one or both of the one end d and the other end f of the dew condensation suppressor 53, respectively. Moreover, you may provide in the substantially intermediate part of the dew condensation suppressor 53. FIG.

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 / humidity of the outside air. During the execution of the first state, the temperature near the other end of the dew condensation suppressor 53 is below the dew point temperature. After detection, it can be switched to the second state. Similarly, during the 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. In these cases, the switching is performed in consideration of the time from the detection that the dew point temperature has been reached or less until the dropping, for example, either immediately after detection, 20 minutes, 30 minutes, 40 minutes or 50 minutes. May be set as the lower limit and any other as the upper limit. Note that the upper limit is preferably 20 minutes or 30 minutes in consideration of the time for dew condensation to grow after the dew point temperature is reached.

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 dew condensation by suppressing the temperature decrease on both sides (region A and region C) of the dew condensation suppressor 53. Moreover, by switching the direction of the refrigerant, it is possible to suppress any part of the dew condensation suppressor 53 from becoming much hotter than the other parts, and to reduce the amount of heat entering the interior.

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 illustrating 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 can be in a third state in which the dew condensation suppressor 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 shows the 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. A valve seat 65 and a valve body 64 are provided inside the flow path switching valve 43. 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 into the flow path switching valve 43 from the opening 60 passes through the opening 61 and flows out from the flow path switching valve 43 to the pipe 57. After the refrigerant flows in the order of the pipe 57 and the one end side of the dew condensation suppressor 53 and the pipe 58, the refrigerant again flows into the flow path switching valve 64 from the opening 62 connected to the pipe 58. The refrigerant flowing into the flow path switching valve 43 is communicated between 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. 12B shows the third state. When the valve body 64 is rotated to connect the opening 60 and the opening 63, the refrigerant that has flowed into the flow path switching valve 43 from the opening 60 flows out into the pipe 59 connected to the opening 63. For this reason, it can suppress that a refrigerant | coolant flows into the dew condensation suppressor 53. FIG.

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 shows the second state. When the valve body 64 is rotated and fixed at a predetermined position, the refrigerant that has flowed into the flow path switching valve 43 from the opening 60 flows out of the pipe 58 connected to the opening 62, and the dew condensation suppressor 53. It flows from one end to the other. After the refrigerant passes through the pipe 57 connected to the dew condensation suppressor 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 between 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 is an example of a change with time in the opening edge temperature. The first state and the second state in which the refrigerant flows through the condensation suppressor 53 and heats the opening edge are referred to as a heating operation. The third state in which the dew condensation suppressor 53 is bypassed is called non-heating operation. In the present embodiment, control is performed to repeatedly switch the state according to a predetermined heating operation time and non-heating operation time. Thereby, the surface average temperature of an opening edge can be made low compared with the case of Example 1. For this reason, the heat penetration | invasion into a store | warehouse | chamber is suppressed more.

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 the heating control of the dew condensation suppressor 53, where the horizontal axis is the relative humidity and the vertical axis is the heating rate by the dew condensation suppressor 53. For example, in the case of RH2 where the relative humidity is high, there is a high possibility of dew condensation on the surface of the opening edge. Therefore, the ratio of the time (tA2) for which the refrigerant flows to the dew condensation suppressor 53 side is long, and The ratio of the time (tB2) during which the refrigerant flows is shortened. On the other hand, in the case of RH1 where the humidity is low, the possibility of dew condensation on the surface of the opening edge is reduced. Therefore, the ratio (tA1) of flowing the refrigerant to the dew condensation suppressor 53 side is short, and the refrigerant is placed on the bypass side of the dew condensation suppressor 53. It is preferable to increase the proportion of time (tB1) during which the gas flows.

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 an installation space problem or an increase in the amount of heat penetration due to interference with the door packing contacting the opening edge, the outside temperature sensor 37 and the 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 configuration diagram of the refrigeration cycle. In the refrigeration cycle of this embodiment, the decompression unit 67 and the decompression unit 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 chamber is small, for example, when the door 2-6 is not opened or closed, the compressor 24 is operated at a low speed, and the pressure reducing unit 73 having a large pressure reduction amount is selected accordingly, thereby improving energy saving. On the other hand, when the heat load in the refrigerator is large, for example, when a large amount of food stored in the refrigerator 1 is put at a time, the compressor 24 is operated at high speed and the decompression unit 67 with a small decompression amount is selected to achieve high cooling performance. It is good to show.

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. A valve seat 90 and a valve body 89 are provided inside the flow path switching valve 47. The valve seat 90 is provided with openings 82, 83, 85, 84, 86 connected to the pipes 56, 57, 58, 91, 92, respectively. The flow path switching valve 47 is a five-way valve having five openings 82-86 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。 16 and 17 are configuration diagrams showing the switching states of the refrigeration cycle. 16 (a), (b), and (c) are the same as in the strong second state and third state in which the refrigerant is flown in the same manner as in the second state of Example 1 after selecting the decompression unit 73, respectively. The strong third state in which the refrigerant is flown through, and the strong first state in which the refrigerant is flowed 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) are similar to the weak second state and the third state, respectively, in which the decompression unit 67 is selected and the other flows in the same manner as the second state of the first embodiment. The weak first state in which the refrigerant is flown in the same manner as the first state and the weak third state in which the refrigerant flows. These are collectively referred to as the weak state.

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 that has passed through the pipe 56 flows into the flow path switching valve 47 from the opening 82, passes through the opening 85, and flows out from the flow path switching valve 47 to the pipe 58. After the refrigerant has flowed from the region C side through the dew condensation suppressor 53 connected to the pipe 58, the refrigerant passes through the pipe 57 connected to the other end of the dew condensation suppressor 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 that has flowed into the flow path switching valve 47 communicates with the opening 83 and the opening 86 through the groove 88 and flows out from 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 this 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 that has passed through the pipe 56 flows into the flow path switching valve 47 from the opening 82, passes through the opening 86, and flows out from the flow path switching valve 47 to the pipe 92. 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 flow path switching valve 47 from the opening 82, passes through the opening 83, and flows out from the flow path switching valve 47 to the pipe 57. After the refrigerant flows from the region A side of the dew condensation suppressor 53 connected to the pipe 57, the refrigerant passes through the pipe 58 connected to the other end of the dew condensation suppressor 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 that has flowed into the flow path switching valve 47 communicates between the opening 85 and the opening 86 through the groove 87 and flows out from 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 that has passed through the pipe 56 flows into the flow path switching valve 47 from the opening 82, passes through the opening 85, and flows out from the flow path switching valve 47 to the pipe 58. After the refrigerant flows from the region C side of the dew condensation suppressor 53 connected to the pipe 58, the refrigerant passes through the pipe 57 connected to the other end of the dew condensation suppressor 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 that has flowed into the flow path switching valve 47 communicates with the opening 83 and the opening 84 through 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 this 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 that has passed through the pipe 56 flows into the flow path switching valve 47 from the opening 82, passes through the opening 84, and flows out from the flow path switching valve 47 to the pipe 91. 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 that has passed through the pipe 56 flows into the flow path switching valve 47 from the opening 82, passes through the opening 83, and flows out from the flow path switching valve 47 to the pipe 57. After the refrigerant flows from the region A side of the dew condensation suppressor 53 connected to the pipe 57, the refrigerant passes through the pipe 58 connected to the other end of the dew condensation suppressor 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 that has flowed into the flow path switching valve 47 communicates between the opening 85 and the opening 84 through 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 further upstream. Further, when the rotational speed of the machine room fan 54 is increased to improve the heat dissipation performance of the first radiator 50, 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, the energy saving performance can be improved by executing the strong state when the thermal load in the warehouse is small. Moreover, the same effect is acquired if a weak state is performed when the thermal load in a warehouse is large. The timing for switching between the first state and the second state 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 described above, in each embodiment that is an example of the present invention, through the switching operation of the flow path switching valve, the first state that flows from one end side to the other end side of the dew condensation suppressor and the second state that flows from the other end side to the one end side Can be realized. At this time, in both the first state and the second state, the refrigerant can flow in the order of the radiator, the dew condensation suppressor, and the decompression unit. Thereby, it can suppress that the refrigerant | coolant temperature which flows through a dew condensation inhibitor 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。 Moreover, when the 3rd state which bypasses a dew condensation inhibitor can be performed, energy-saving property can be improved further.
The first state and the second state do not necessarily exclude the presence of other components between the radiator, the dew condensation suppressor, and the decompression unit, but are referred to as the radiator, the dew condensation suppressor, and the decompression unit. For the three components, the order in which the refrigerant flows may be as described above. The third state also does not necessarily exclude the presence of other components between the radiator and the decompression unit.

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 Refrigerated room (storage room in refrigerated temperature zone)
2a, 2b Refrigeration room door 3 Ice making room 3a Ice making room 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 container 6 Vegetable room 6a Vegetable room door 6b Storage container 7 Freezer room (freezer temperature storage room)
8 Cooler storage chamber 9 Fan 10 Heat insulation box 10a Outer box 10b Inner box 11 Refrigeration room cold air duct 11a, 11b, 11c Refrigeration room cold air discharge port 12 Upper stage freezing room cold air duct 12a Outlet 13 Lower stage freezing room cold air duct 13a, 13b Discharge port 14 Cooler 15 Cover 16 Hinge cover 17 Freezing room cold air return section 18 Vegetable room cold air return duct 18a Vegetable room cold air return section 18b Vegetable room cold air return section 19 Heater 20 Cold room damper 20a Baffle 21 Freezer room damper 21a Baffle 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 Evaporating dishes 33a, 33b, 33c Door pockets 34a, 34b, 34c, 34d Shelf 35 Storage Chambers 36a, 36b, 36c, 36d Partition cover 37 Outside temperature sensor 38 Outside humidity sensor 39 Machine room 40 Insulating partition wall 41 Cold room temperature sensor (refrigerated room temperature)
42 Freezer temperature sensor (freezer temperature)
43 Channel switching valve (four-way valve)
44 Heat flow (outside)
45 Heat flow (inside the warehouse)
46 Insulation partition wall 47 Flow path switching valve (5-way valve)
48 Channel switching valve (refrigerant reverse valve)
50 First heat radiator 51 Second heat radiator 52 Third heat 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 66 Dryer 67 Pressure reducing part (first pressure reducing part)
68 Pipe 69 Heat exchange section 70 Pipe 71 Gas phase component 72 Liquid phase component 73 Decompression section (second decompression section)
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,
A radiator provided in one or more places in the machine room, side, top and back of the box;
A dew condensation suppressor provided at the opening edge of the box;
A flow path switching unit;
A refrigerator including a refrigeration cycle having a decompression unit,
The flow path switching unit is
A first state in which the refrigerant flows in the order of the radiator, the other end side from the one end side of the dew condensation suppressor, and the decompression unit;
A refrigerator capable of executing the second state in which the refrigerant flows in the order of the radiator, the other end side of the dew condensation suppressor, the one end side, and the decompression unit.

The refrigerator according to claim 1, wherein a part or all of the refrigerant flowing through the dew condensation suppressor is in a liquid phase region in both the first state and the second state.

The refrigerator according to claim 2, wherein the flow path switching unit is capable of executing a third state in which the refrigerant flows in the order of the radiator and the decompression unit to bypass the dew condensation suppressor.

The decompression unit is
A first decompression section;
Having a second decompression part having a greater decompression amount than the first decompression part,
The flow path switching unit is
For each of the first, second and third states, a weak first, weak second, weak third state in which a refrigerant flows through the first decompression section, and
The refrigerator according to claim 3, wherein the refrigerator can be executed by distinguishing between a strong first state, a strong second state, and a strong third state in which the refrigerant flows through the second decompression unit.

The sum of the lengths of the pipe connecting one end of the flow path switching unit and the dew condensation suppressor, the dew condensation suppressor, and the pipe connecting the other end of the flow path switching unit and the dew condensation suppressor is the compression The refrigerator according to any one of claims 1 to 4, wherein the refrigerator is 10% or more of a length from a discharge side of the machine to an upstream side of the decompression unit.

The length of the dew condensation suppressor is a pipe that connects one end of the flow path switching unit and the dew condensation suppressor, the dew condensation suppressor, a pipe that connects the flow path switching unit and the other end of the dew condensation suppressor, The refrigerator according to claim 1, wherein the refrigerator is 50% or more of the sum of the lengths of the refrigerators.

The temperature sensor is provided in one, two, or three portions of one end side, the other end side, and a substantially intermediate portion of the partition portion that covers the dew condensation suppressor. The refrigerator as described in any one of thru | or 4.