JP2003035462A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a cooling speed of a refrigerating chamber, to improve also the efficiency of a refrigerating cycle and thereby to reduce the amount of power consumption, by an inexpensive constitution having a small number of components. SOLUTION: The refrigerator has a first refrigerant circuit wherein a pressure reducing device 24a for a freezing chamber, an evaporator 25a for the freezing chamber and a check valve 27 are connected in series and a second refrigerant circuit wherein a pressure reducing device 24b for a refrigerating chamber and an evaporator 25b for the refrigerating chamber are connected in series. The pressure reducing device 24a for the freezing chamber and the second refrigerant circuit are connected in parallel and a selector valve 24 is provided at an inlet-side branch part of the parallel circuits. A bypass circuit connecting the selector valve 24 with the intake piping 29 of a compressor 21 is provided and the selector valve 24 is constituted of one valve which enables execution of switchover to selective communication with the pressure reducing device 24a for the freezing chamber, the second refrigerant circuit and the bypass circuit and to a state of full closure to these refrigerant circuits. In a state wherein the compressor 21 is stopped, the selector valve 24 is controlled to be in the state of full closure to the parallel refrigerant circuits and the bypass circuit 31.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、冷蔵庫に係り、特
に冷凍室用蒸発器と冷蔵室用蒸発器を有する冷蔵庫に好
適なものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator, and particularly to a refrigerator having a freezer compartment evaporator and a refrigerator compartment evaporator.

【０００２】[0002]

【従来の技術】従来の冷蔵庫としては、特開平１０−２
０５９５８号公報の図５に係る第５実施形態例に関する
ものがある。2. Description of the Related Art A conventional refrigerator is disclosed in Japanese Patent Laid-Open No. 10-2.
There is one related to a fifth embodiment example according to FIG.

【０００３】すなわち、この冷蔵庫では、圧縮機と凝縮
器と冷媒流路と冷蔵室絞り、冷凍室絞りと冷蔵室用蒸発
器、冷凍室用蒸発器と冷蔵室入口側開閉弁、冷凍室入口
側開閉弁と冷蔵室出口側開閉弁、冷凍室出口側開閉弁
（チェック弁でも可との記載あり）等により冷凍サイク
ルを構成している。冷蔵室用蒸発器、冷凍室用蒸発器は
それぞれ冷蔵室内と冷凍室内に配置している。冷媒流路
から分岐した冷蔵室側の分岐冷媒流路に冷蔵室入口側開
閉弁と冷蔵室絞りとを直列接続し、冷蔵室絞りを冷蔵室
用蒸発器の入口側に接続し、さらに冷蔵室用蒸発器の出
口側の分岐冷媒流路に冷蔵室出口側開閉弁を接続してい
る。そして、冷蔵室用蒸発器の出口側に出口温度を検出
する冷蔵室用蒸発器出口温度センサを配置している。冷
蔵室内には、冷蔵室内温度を検出する冷蔵室庫内温度セ
ンサと、冷蔵室用蒸発器から冷蔵室へ空気を循環させる
冷蔵室ファンとを配置している。同様に、冷媒流路から
分岐した冷凍室側の分岐冷媒流路に冷凍室入口側開閉弁
と冷凍室絞りとを直列接続し、冷凍室絞りを冷凍室用蒸
発器の入口側に接続し、さらに冷凍室用蒸発器の出口側
の分岐冷媒流路に冷凍室出口側開閉弁を接続している。
そして、冷凍室用蒸発器の出口側に出口温度を検出する
冷凍室用蒸発器出口温度センサを配置している。冷凍室
内には、冷凍室内温度を検出する冷凍室庫内温度センサ
と、第蒸発器から冷凍室へ空気を循環させる冷凍室ファ
ンと、冷凍室用蒸発器に付着した霜を除霜する除霜ヒー
タとを配置している。That is, in this refrigerator, a compressor, a condenser, a refrigerant passage, a refrigerating compartment throttle, a freezing compartment constrictor and a refrigerating compartment evaporator, a freezing compartment evaporator and a refrigerating compartment inlet side opening / closing valve, a freezing compartment inlet side. A refrigeration cycle is composed of an on-off valve, a refrigerating compartment outlet side opening / closing valve, a freezing compartment outlet side opening / closing valve (there is also a check valve). The refrigerator compartment evaporator and the freezer compartment evaporator are respectively arranged in the refrigerator compartment and the freezer compartment. A refrigerating compartment inlet side opening / closing valve and a refrigerating compartment throttle are connected in series to a refrigerating compartment side branched refrigerant passage branched from the refrigerant passage, and the refrigerating compartment throttle is connected to the inlet side of the refrigerating compartment evaporator, and the refrigerating compartment is further connected. A refrigerating compartment outlet side opening / closing valve is connected to the branch refrigerant flow passage on the outlet side of the evaporator. A refrigerating compartment evaporator outlet temperature sensor for detecting the outlet temperature is arranged on the outlet side of the refrigerating compartment evaporator. Inside the refrigerating compartment, a temperature sensor inside the refrigerating compartment for detecting the temperature of the refrigerating compartment and a refrigerating compartment fan for circulating air from the evaporator for the refrigerating compartment to the refrigerating compartment are arranged. Similarly, the freezing compartment inlet side opening / closing valve and the freezing compartment throttle are connected in series to the branching refrigerant passage on the freezing compartment side branched from the refrigerant passage, and the freezing compartment throttle is connected to the inlet side of the evaporator for the freezing compartment, Further, a freezing compartment outlet side opening / closing valve is connected to the branch refrigerant flow path on the outlet side of the freezing compartment evaporator.
Then, a freezer compartment evaporator outlet temperature sensor for detecting the outlet temperature is arranged on the outlet side of the freezer compartment evaporator. In the freezer compartment, a temperature sensor inside the freezer compartment that detects the temperature of the freezer compartment, a freezer compartment fan that circulates air from the first evaporator to the freezer compartment, and defrost that defrosts frost attached to the evaporator for the freezer compartment. A heater is arranged.

【０００４】かかる冷凍サイクルを稼働することによ
り、冷蔵室用蒸発器、冷凍室用蒸発器において冷媒液が
蒸発して冷媒ガスとなる間に周囲の熱を奪い、冷蔵室と
冷凍室とを冷却する。この冷却中に、冷蔵室、冷凍室用
蒸発器出口温度センサの検出温度と、冷蔵室、冷凍室庫
内温度センサの検出温度とを比較する。そして、例え
ば、冷凍室においては出口温度の方が庫内温度より低
く、且つ冷蔵室においては出口温度の方が庫内温度より
高くなった場合には、冷蔵室では冷媒液が分岐冷媒流路
側に十分に流れていない状態を起し、冷凍室では冷媒液
が十分に流れている片流れ状態になったものと判断す
る。そこで、冷媒液が十分に流れている冷凍室側の冷凍
室入口側開閉弁を閉じて冷媒液の流れを停止させ、流れ
の悪い冷蔵室側の冷蔵室入口側開閉弁は開いたままに
し、冷蔵室用蒸発器に強制的に冷媒液を流すようにす
る。これにより、冷蔵室用蒸発器には冷媒液が十分に流
れ、冷蔵室は冷却される。その後、冷蔵室において、蒸
発器の出口温度の方が庫内温度より低くなった時点で、
冷凍室の冷凍室入口側開閉弁を開き、冷蔵室用蒸発器、
冷凍室用蒸発器にそれぞれ冷媒液が流れるようにする。
そして、冷凍室の温度が冷却終了温度に達すると、冷凍
室入口側開閉弁を閉じ、冷蔵室の運転のみを行なう。By operating such a refrigerating cycle, the refrigerating compartment evaporator and the freezing compartment evaporator deprive the surrounding heat while the refrigerant liquid evaporates and becomes a refrigerant gas, thereby cooling the refrigerating compartment and the freezing compartment. To do. During this cooling, the temperature detected by the refrigerator outlet / freezer evaporator outlet temperature sensor is compared with the temperature detected by the refrigerator / freezer internal temperature sensor. And, for example, when the outlet temperature is lower than the internal temperature in the freezing room and the outlet temperature is higher than the internal temperature in the refrigerating room, the refrigerant liquid in the refrigerating room is the branch refrigerant flow path side. Therefore, it is determined that the freezing chamber has become a one-way state in which the refrigerant liquid is sufficiently flowing. Therefore, the freezing compartment inlet side opening / closing valve on the freezing compartment side where the refrigerant liquid is sufficiently flowing is stopped to stop the flow of the refrigerant liquid, and the refrigerating compartment inlet side opening / closing valve on the refrigerating compartment side where the flow is poor is left open, Refrigerant liquid is forced to flow through the refrigerator evaporator. As a result, the refrigerant liquid sufficiently flows through the refrigerator evaporator, and the refrigerator is cooled. After that, in the refrigerating room, when the outlet temperature of the evaporator becomes lower than the internal temperature,
Open the open / close valve on the freezer side of the freezer,
Refrigerant liquid is allowed to flow to the freezer evaporators.
When the temperature of the freezing compartment reaches the cooling end temperature, the opening / closing valve on the freezing compartment inlet side is closed and only the operation of the refrigerating compartment is performed.

【０００５】そして、冷凍室の温度が冷却終了温度に達
すると、冷凍室の冷凍室入口側開閉弁を閉じて、冷凍室
のファンも停止させると共に、冷凍室の冷凍室出口側開
閉弁を閉じ、冷蔵室のみの運転を行う。冷蔵室のファン
を運転したまま、冷蔵室の冷蔵室出口側開閉弁を閉じ、
蒸発器の出口温度が庫内温度以上になったなら、冷蔵室
出口側開閉弁を開け、更に出口温度が庫内温度以下にな
ったなら、冷蔵室出口側開閉弁を閉じるという動作を、
蒸発器の出口温度が庫内温度以上になるまで、繰り返
す。その後、冷蔵室の冷蔵室出口側開閉弁を閉じ、蒸発
器出口温度が＋５℃以上になるまで、ファンを運転す
る。ファンは冷蔵室３３の温度が０℃以上であるため、
蒸発器についた霜を溶かすことができ、短時間に冷蔵室
用蒸発器の除霜ができると共に、ヒータなど電気入力に
よる除霜法に比べ、効率的であると共に、余分な加熱を
しないので保存している食品の温度を一定に保て、保存
の改善もできる。更に、冷凍室の除霜時に冷凍室の蒸発
器の前後の分岐冷媒回路を閉じることによりサイクルか
ら隔離でき、冷蔵室の冷却運転を行いながら、除霜ヒー
タで加熱してヒータ除霜を行う。When the temperature of the freezing compartment reaches the cooling end temperature, the opening / closing valve on the freezing compartment inlet side of the freezing compartment is closed, the fan of the freezing compartment is stopped, and the opening / closing valve on the freezing compartment outlet side of the freezing compartment is closed. , Operate only in the refrigerator compartment. While operating the fan in the refrigerator compartment, close the opening / closing valve on the outlet side of the refrigerator compartment,
If the outlet temperature of the evaporator becomes higher than the temperature inside the refrigerator, open the refrigerating chamber outlet side opening / closing valve, and if the outlet temperature becomes lower than the inside temperature, close the refrigerating chamber outlet side opening / closing valve.
Repeat until the outlet temperature of the evaporator reaches or exceeds the internal temperature. Then, the on-off valve of the refrigerating compartment outlet side of the refrigerating compartment is closed, and the fan is operated until the evaporator outlet temperature reaches + 5 ° C or higher. Since the temperature of the cooling chamber 33 of the fan is 0 ° C or higher,
The frost on the evaporator can be melted, the evaporator for the refrigerating room can be defrosted in a short time, and it is more efficient than the defrosting method that uses an electric input such as a heater, and it does not require extra heating for storage. The temperature of the food being maintained can be kept constant and the preservation can be improved. Further, when defrosting the freezer compartment, the branch refrigerant circuits before and after the evaporator of the freezer compartment can be closed to isolate from the cycle, and while the cooling operation of the refrigerating compartment is performed, the defrost heater is used to perform heater defrosting.

【０００６】[0006]

【発明が解決しようとする課題】従来の冷蔵庫では、冷
蔵室用蒸発器の冷蔵室入口側開閉器と冷凍室用蒸発器の
冷凍室入口側開閉弁の２個の電磁開閉弁およびそれぞれ
の制御線が必要であり、制御が面倒になると共に、原価
高を招くものであった。In a conventional refrigerator, there are two electromagnetic on-off valves, a refrigerator compartment inlet-side switch of a refrigerating compartment evaporator and a freezer compartment inlet-side opening / closing valve of a freezer compartment evaporator, and their respective controls. Lines were required, which made control cumbersome and costly.

【０００７】また、従来の冷蔵庫では、圧縮機が停止し
た状態における冷凍室用蒸発器内に冷媒が溜まることに
関しては開示されていない。すなわち、冷凍室用蒸発器
は、圧縮機が停止した状態において温度が低い冷凍室
（例えば−１８℃）の空気により冷却された状態になる
ため、冷凍サイクル中の冷媒が凝縮して溜まってしまう
という現象が発生する。これにより冷蔵室の温度が上昇
して圧縮機の運転が開始されても、停止時に冷凍室用蒸
発器の中に溜まった冷媒が多いために、直ぐには冷蔵室
用蒸発器に十分な冷媒量を供給できず、冷媒量不足を招
いてスーパーヒートし、冷蔵室の冷却速度が遅くなると
共に、冷凍サイクルの効率が低下し、消費電力量が増大
してしまうという課題があった。Further, in the conventional refrigerator, there is no disclosure about the fact that the refrigerant accumulates in the evaporator for the freezer compartment when the compressor is stopped. That is, since the evaporator for the freezer compartment is cooled by the air in the freezer compartment (for example, -18 ° C) having a low temperature when the compressor is stopped, the refrigerant in the refrigeration cycle is condensed and accumulated. The phenomenon occurs. As a result, even if the temperature of the refrigerating room rises and the compressor starts operating, a large amount of refrigerant accumulates in the freezer compartment evaporator when the compressor is stopped. However, there is a problem in that the refrigerant amount becomes insufficient and superheat occurs, the cooling rate of the refrigerating chamber becomes slow, the efficiency of the refrigeration cycle decreases, and the power consumption increases.

【０００８】また、従来の冷蔵庫では、圧縮機が停止し
た直後に冷凍室用蒸発器および冷蔵室用蒸発器内に凝縮
器から高温の冷媒が流れ込むことに関しては開示されて
いない。すなわち、圧縮機が停止した直後に凝縮器の高
温冷媒が冷凍室用蒸発器および冷蔵室用蒸発器に流れ込
みむことにより、冷凍室用蒸発器および冷蔵室用蒸発器
の温度を上昇させて熱負荷を増加させ、消費電力量が増
大してしまうという課題があった。そこで、凝縮器の高
温冷媒が冷凍室用蒸発器および冷蔵室用蒸発器に流れ込
むのを防ぐために、冷凍室用蒸発器および冷蔵室用蒸発
器の入口側を圧縮機が停止した際に同時に閉鎖すること
が考えられるが、この場合には、圧縮機前後の圧力バラ
ンスが大きい状態が維持され、圧縮機の起動不能のおそ
れが生じるという課題があった。Further, in the conventional refrigerator, there is no disclosure about the flow of the high temperature refrigerant from the condenser into the evaporator for the freezer compartment and the evaporator for the refrigerator compartment immediately after the compressor is stopped. That is, immediately after the compressor is stopped, the high-temperature refrigerant in the condenser flows into the freezer compartment evaporator and the refrigerator compartment evaporator to raise the temperature of the freezer compartment evaporator and the refrigerator compartment evaporator, and heat the refrigerant. There is a problem that the load is increased and the power consumption is increased. Therefore, in order to prevent the hot refrigerant in the condenser from flowing into the freezer compartment evaporator and the refrigerator compartment evaporator, the inlet sides of the freezer compartment evaporator and the refrigerator compartment evaporator are simultaneously closed when the compressor stops. However, in this case, there is a problem in that the pressure balance before and after the compressor is kept large and the compressor may not be started.

【０００９】本発明の第１の目的は、部品点数の少ない
安価な構成で、冷却開始時に冷蔵室および冷蔵室の冷却
速度を早くできると共に冷却運転停止時に熱負荷の増加
を防止でき、冷凍サイクルの効率を向上して消費電力量
の低減を図ることができる冷蔵庫を提供することにあ
る。A first object of the present invention is to provide an inexpensive structure with a small number of parts, which makes it possible to speed up the cooling rate of the refrigerating chamber and the refrigerating chamber at the start of cooling, prevent an increase in heat load when the cooling operation is stopped, and prevent the refrigeration cycle. Another object of the present invention is to provide a refrigerator capable of improving the efficiency of the above and reducing the power consumption.

【００１０】本発明の第２の目的は、部品点数の少ない
安価な構成で、冷却開始時に冷蔵室および冷蔵室の冷却
速度を早くできると共に冷却運転停止時に熱負荷の増加
を防止でき、冷凍サイクルの効率を向上して消費電力量
の低減を図ることができ、しかも圧縮機の起動が容易な
冷蔵庫を提供することにある。A second object of the present invention is to provide an inexpensive structure with a small number of parts, to increase the cooling rate of the refrigerating chamber and the refrigerating chamber at the start of cooling, and to prevent an increase in heat load when the cooling operation is stopped. It is to provide a refrigerator in which the efficiency can be improved to reduce the power consumption and the compressor can be easily started.

【００１１】本発明の第３の目的は、部品点数の少ない
安価な構成で、冷凍室および冷蔵室を独立して同時およ
び単独に冷却することができると共に冷蔵室の冷却運転
停止時に冷蔵室ファンによる除霜運転をすることがで
き、さらに冷却開始時に冷凍室および冷蔵室の冷却速度
を早くできると共に冷却運転停止時に熱負荷の増加を防
止でき、冷凍サイクルの効率を向上して消費電力量の低
減を図ることができ、しかも圧縮機の起動が容易な冷蔵
庫を提供することにある。る。A third object of the present invention is to provide an inexpensive structure with a small number of parts, which can cool the freezing compartment and the refrigerating compartment independently simultaneously and independently, and at the same time, the refrigerating compartment fan when the cooling operation of the refrigerating compartment is stopped. Defrosting operation can be performed, the cooling speed of the freezer compartment and the refrigerating compartment can be increased at the start of cooling, and the heat load can be prevented from increasing when the cooling operation is stopped, improving the efficiency of the refrigeration cycle and reducing the power consumption. It is an object of the present invention to provide a refrigerator which can be reduced in number and whose compressor can be started easily. It

【００１２】[0012]

【課題を解決するための手段】上記第１の目的を達成す
るための本発明の第１の特徴は、圧縮機と、凝縮器と、
冷凍室用減圧装置、冷凍室用蒸発器および逆止弁を順に
直列に接続した第１冷媒回路と、冷蔵室用減圧装置およ
び冷蔵室用蒸発器を順に直列に接続した第２冷媒回路と
を有する冷凍サイクルを備えると共に、前記冷凍サイク
ルを制御する制御装置を備えた冷蔵庫において、前記冷
凍サイクルは、前記凝縮器の出口側と前記圧縮機の入口
側との間に前記第1冷媒回路を接続し、前記冷凍室用減
圧装置および前記第２冷媒回路を並列に接続して並列冷
媒回路を形成し、この並列回路の入口側分岐部に切換弁
を設け、前記切換弁と前記圧縮機の入口側とを連通する
バイパス回路を設け、前記切換弁は、前記並列冷媒回路
および前記バイパス回路への選択的連通と、前記並列冷
媒回路および前記バイパス回路への同時閉鎖との状態に
切換え可能な一つの弁で構成し、前記制御装置は、前記
圧縮機を停止した状態で、前記切換弁を前記並列冷媒回
路および前記バイパス回路への同時閉鎖の状態に制御す
る構成にしたことにある。A first feature of the present invention for achieving the above first object is to provide a compressor, a condenser, and
A first refrigerant circuit in which a decompression device for a freezer compartment, an evaporator for a freezer compartment, and a check valve are sequentially connected in series, and a second refrigerant circuit in which a decompression device for a refrigeration compartment and an evaporator for a refrigeration room are sequentially connected in series In a refrigerator having a refrigeration cycle having, a refrigerator provided with a control device for controlling the refrigeration cycle, the refrigeration cycle connects the first refrigerant circuit between the outlet side of the condenser and the inlet side of the compressor. Then, the decompression device for the freezer compartment and the second refrigerant circuit are connected in parallel to form a parallel refrigerant circuit, and a switching valve is provided at an inlet side branch portion of the parallel circuit, and the switching valve and the inlet of the compressor. A bypass circuit communicating with the side is provided, and the switching valve is capable of switching between a state of selective communication with the parallel refrigerant circuit and the bypass circuit and a state of simultaneous closing of the parallel refrigerant circuit and the bypass circuit. Horn It is configured by a valve, and the control device is configured to control the switching valve to a state in which the parallel refrigerant circuit and the bypass circuit are simultaneously closed while the compressor is stopped.

【００１３】上記第１の目的を達成するための本発明の
第２の特徴は、圧縮機と、凝縮器と、冷凍室用減圧装
置、冷凍室用蒸発器および逆止弁を順に直列に接続した
第１冷媒回路と、冷蔵室用減圧装置および冷蔵室用蒸発
器を順に直列に接続した第２冷媒回路とを有する冷凍サ
イクルを備えると共に、前記冷凍サイクルを制御する制
御装置を備えた冷蔵庫において、前記冷凍サイクルは、
前記凝縮器の出口側と前記圧縮機の入口側との間に前記
第1冷媒回路を接続し、前記冷凍室用減圧装置および前
記第２冷媒回路を並列に接続して並列冷媒回路を形成
し、この並列回路の入口側分岐部に切換弁を設け、前記
切換弁と前記圧縮機の入口側とを連通するバイパス回路
を設け、前記切換弁は、前記並列冷媒回路および前記バ
イパス回路への選択的連通と、前記並列冷媒回路および
前記バイパス回路への同時閉鎖との状態に切換え可能な
一つの弁で構成し、前記制御装置は、前記切換弁を前記
並列冷媒回路およびバイパス回路への同時閉鎖の状態で
前記圧縮機を所定時間運転するように制御する構成にし
たことにある。A second feature of the present invention for achieving the first object is to connect a compressor, a condenser, a decompressor for a freezer compartment, an evaporator for a freezer compartment and a check valve in series in order. A refrigerator including a refrigerating cycle having a first refrigerant circuit, a second refrigerant circuit in which a refrigerating chamber decompressor and a refrigerating chamber evaporator are sequentially connected in series, and a control device for controlling the refrigerating cycle. , The refrigeration cycle
The first refrigerant circuit is connected between the outlet side of the condenser and the inlet side of the compressor, and the decompression device for the freezer compartment and the second refrigerant circuit are connected in parallel to form a parallel refrigerant circuit. , A switching valve is provided at the inlet side branch portion of the parallel circuit, and a bypass circuit is provided that connects the switching valve and the inlet side of the compressor, and the switching valve selects the parallel refrigerant circuit and the bypass circuit. A single valve that can be switched between a state of active communication and a simultaneous closing of the parallel refrigerant circuit and the bypass circuit, and the control device simultaneously closes the switching valve to the parallel refrigerant circuit and the bypass circuit. In this state, the compressor is controlled to operate for a predetermined time.

【００１４】上記第２の目的を達成するための本発明の
第３の特徴は、圧縮機と、凝縮器と、冷凍室用減圧装
置、冷凍室用蒸発器および逆止弁を順に直列に接続した
第１冷媒回路と、冷蔵室用減圧装置および冷蔵室用蒸発
器を順に直列に接続した第２冷媒回路とを有する冷凍サ
イクルを備えると共に、前記冷凍サイクルを制御する制
御装置を備えた冷蔵庫において、前記冷凍サイクルは、
前記凝縮器の出口側と前記圧縮機の入口側との間に前記
第1冷媒回路を接続し、前記冷凍室用減圧装置および前
記第２冷媒回路を並列に接続して並列冷媒回路を形成
し、この並列回路の入口側分岐部に切換弁を設け、前記
切換弁と前記圧縮機の入口側とを連通するバイパス回路
を設け、前記切換弁は、前記並列冷媒回路および前記バ
イパス回路への選択的連通と、前記並列冷媒回路および
前記バイパス回路への同時閉鎖との状態に切換え可能な
一つの弁で構成し、前記制御装置は、前記切換弁を前記
並列冷媒回路への同時閉鎖の状態に切換えてから前記並
列冷媒回路への選択的連通の状態に切換える間に、前記
切換弁を前記バイパス回路への選択的連通の状態に所定
時間切換えるように制御する構成にしたことにある。A third feature of the present invention for achieving the second object is to connect a compressor, a condenser, a decompression device for a freezer compartment, an evaporator for a freezer compartment and a check valve in series in order. A refrigerator including a refrigerating cycle having a first refrigerant circuit, a second refrigerant circuit in which a refrigerating chamber decompressor and a refrigerating chamber evaporator are sequentially connected in series, and a control device for controlling the refrigerating cycle. , The refrigeration cycle
The first refrigerant circuit is connected between the outlet side of the condenser and the inlet side of the compressor, and the decompression device for the freezer compartment and the second refrigerant circuit are connected in parallel to form a parallel refrigerant circuit. , A switching valve is provided at the inlet side branch portion of the parallel circuit, and a bypass circuit is provided that connects the switching valve and the inlet side of the compressor, and the switching valve selects the parallel refrigerant circuit and the bypass circuit. Physical communication and one valve that can be switched to a state in which the parallel refrigerant circuit and the bypass circuit are simultaneously closed, and the control device sets the switching valve to a state in which the parallel refrigerant circuit and the bypass circuit are simultaneously closed. The configuration is such that the switching valve is controlled to switch to the state of selective communication to the bypass circuit for a predetermined time while switching to the state of selective communication to the parallel refrigerant circuit after switching.

【００１５】上記第３の目的を達成するための本発明の
第４の特徴は、圧縮機と、凝縮器と、冷凍室用減圧装
置、冷凍室用蒸発器および逆止弁を順に直列に接続した
第１冷媒回路と、冷蔵室用減圧装置および冷蔵室用蒸発
器を順に直列に接続した第２冷媒回路とを有する冷凍サ
イクルを備えると共に、前記冷凍サイクルを制御する制
御装置および前記冷蔵室用蒸発器の冷気を冷蔵室に通風
する冷蔵室ファンを備えた冷蔵庫において、前記冷凍サ
イクルは、前記凝縮器の出口側と前記圧縮機の入口側と
の間に前記第1冷媒回路を接続し、前記冷凍室用減圧装
置および前記第２冷媒回路を並列に接続して並列冷媒回
路を形成し、この並列回路の入口側分岐部に切換弁を設
け、前記切換弁と前記圧縮機の入口側とを連通するバイ
パス回路を設け、前記切換弁は、前記並列冷媒回路およ
び前記バイパス回路への選択的連通と、前記並列冷媒回
路および前記バイパス回路への同時閉鎖との状態に切換
え可能な一つの弁で構成し、前記制御装置は、前記圧縮
機を停止した状態で、前記切換弁を前記並列冷媒回路お
よび前記バイパス回路への同時閉鎖の状態に制御し、前
記切換弁を前記冷凍室用減圧装置に連通し且つ前記第２
冷媒回路に閉鎖した状態としているときに、前記冷蔵室
ファンを運転するように制御し、前記切換弁を前記並列
冷媒回路およびバイパス回路への同時閉鎖の状態に切換
えた直後に前記圧縮機を短時間だけ継続して運転するよ
うに制御し、前記切換弁を前記並列冷媒回路への同時閉
鎖の状態から前記並列冷媒回路への選択的連通の状態に
移行する直前に前記切換弁を前記バイパス回路への選択
的連通の状態に短時間切換えてから移行するように制御
する構成にしたことにある。A fourth feature of the present invention for achieving the above third object is to connect a compressor, a condenser, a decompressor for a freezer compartment, an evaporator for a freezer compartment, and a check valve in series in order. And a controller for controlling the refrigerating cycle and a refrigerating cycle having a second refrigerant circuit in which a refrigerating chamber decompressor and a refrigerating chamber evaporator are sequentially connected in series. In a refrigerator equipped with a refrigerating compartment fan that ventilates the cool air of the evaporator into a refrigerating compartment, the refrigeration cycle connects the first refrigerant circuit between the outlet side of the condenser and the inlet side of the compressor, The decompression device for the freezer compartment and the second refrigerant circuit are connected in parallel to form a parallel refrigerant circuit, and a switching valve is provided at an inlet side branch portion of the parallel circuit, and the switching valve and the inlet side of the compressor are connected to each other. Bypass circuit that connects the The switching valve is configured by one valve that can be switched to a state of selective communication with the parallel refrigerant circuit and the bypass circuit, and a state of simultaneous closing of the parallel refrigerant circuit and the bypass circuit, and the control device includes: In a state in which the compressor is stopped, the switching valve is controlled to a state in which the parallel refrigerant circuit and the bypass circuit are simultaneously closed, the switching valve communicates with the decompression device for the freezer and the second
When the refrigerant circuit is in a closed state, the refrigerating compartment fan is controlled to operate, and the compressor is short-circuited immediately after the switching valve is switched to a state in which the parallel refrigerant circuit and the bypass circuit are simultaneously closed. The bypass circuit is controlled so as to operate continuously for a period of time, and the switching valve is operated immediately before the switching valve is shifted from a state of simultaneous closing to the parallel refrigerant circuit to a state of selective communication to the parallel refrigerant circuit. The configuration is such that control is performed so as to switch to the state of selective communication with the switch for a short time and then shift.

【００１６】[0016]

【発明の実施の形態】以下、本発明の一実施例を図１か
ら図５を用いて説明する。図１は本発明の一実施例の冷
蔵庫の冷凍サイクル構成図、図２は同冷凍サイクルに用
いる切換弁の切換動作説明図、図３および図４は同冷蔵
庫の動作フローチャート図、図５は同冷蔵庫の動作例の
タイムチャート図である。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. 1 is a configuration diagram of a refrigeration cycle of a refrigerator according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of a switching operation of a switching valve used in the refrigeration cycle, FIGS. 3 and 4 are operation flowchart diagrams of the refrigerator, and FIG. 5 is the same. It is a time chart figure of an operation example of a refrigerator.

【００１７】冷凍サイクルは、図１に示すように、圧縮
機２１、凝縮器２２、冷媒流路２３、キャピラリで構成
された冷凍室用減圧装置２４ａ、キャピラリで構成され
た冷蔵室用減圧装置２４ｂ、冷凍室用蒸発器２５ａ、冷
蔵室用蒸発器２５ｂ、冷媒流路２３の分岐点に介在する
切換弁である切換弁２４、冷凍室用蒸発器２５ａの出口
側に接続された逆止弁２７等より構成されている。そし
て、圧縮機２１はレシプロ型圧縮機が用いられ、冷凍室
用蒸発器２５ａは冷凍室３２を冷却するように配置さ
れ、冷蔵室用蒸発器２５ｂは冷蔵室３３を冷却するよう
に配置されている。As shown in FIG. 1, the refrigerating cycle includes a compressor 21, a condenser 22, a refrigerant flow path 23, a decompression device 24a for a freezing chamber composed of capillaries, and a decompression device 24b for a refrigerating room composed of capillaries. , Freezing compartment evaporator 25a, refrigerating compartment evaporator 25b, switching valve 24 which is a switching valve interposed at the branch point of the refrigerant passage 23, and check valve 27 connected to the outlet side of the freezing compartment evaporator 25a. Etc. A reciprocating compressor is used as the compressor 21, the freezer compartment evaporator 25a is arranged to cool the freezer compartment 32, and the refrigerating compartment evaporator 25b is arranged to cool the refrigerating room 33. There is.

【００１８】凝縮器２２の出口側に接続された冷媒流路
２３は切換弁２４の入口側に接続されている。切換弁２
４の出口側には図２に示すように冷凍室用開口Ｆと冷蔵
室用開口Ｒとバイパス回路用開口Ｂの３つがあり、冷凍
室用開口Ｆは冷凍室用減圧装置２４ａに向う冷媒流路２
３ａと連通して開口し、冷蔵室用開口Ｒは冷蔵室用減圧
装置２４ｂに向う冷媒流路２３ｂと連通して開口し、バ
イパス回路用開口Ｂはバイパス回路３１と連通するよう
に開口する。The refrigerant flow path 23 connected to the outlet side of the condenser 22 is connected to the inlet side of the switching valve 24. Switching valve 2
As shown in FIG. 2, there are three freezing compartment openings F, refrigerating compartment openings R, and bypass circuit openings B on the outlet side of the freezing compartment opening F. Road 2
3a, the refrigerating compartment opening R communicates with the refrigerant flow path 23b toward the refrigerating compartment pressure reducing device 24b, and the bypass circuit opening B communicates with the bypass circuit 31.

【００１９】そして、冷凍室用蒸発器２５ａの出口から
圧縮機２１に向かう吸込配管２９には冷媒の逆止弁２７
がある。冷凍室側冷媒通路２３ａ、冷凍室用減圧装置２
４ａ、冷凍室用蒸発器２５ａ、逆止弁２７、吸込配管２
９は、この順に直列に接続されて、第１冷媒回路を構成
している。更には、冷凍室側において、冷凍室用蒸発器
２５ａから冷凍室３２へ冷却された空気を循環させる冷
凍室ファン２６ａ、冷凍室３２内の温度を検出する冷凍
室温度センサー２８ａ、および冷凍室用蒸発器出口温度
センサ４１ａが設けられている。A check valve 27 for refrigerant is provided in a suction pipe 29 extending from the outlet of the evaporator 25a for the freezer compartment to the compressor 21.
There is. Freezer compartment side refrigerant passage 23a, freezer compartment pressure reducing device 2
4a, freezer evaporator 25a, check valve 27, suction pipe 2
9 is connected in series in this order to form a first refrigerant circuit. Further, on the freezer side, a freezer fan 26a that circulates the cooled air from the freezer evaporator 25a to the freezer 32, a freezer temperature sensor 28a that detects the temperature in the freezer 32, and a freezer room An evaporator outlet temperature sensor 41a is provided.

【００２０】また、冷蔵室側冷媒通路２３ｂ、冷蔵室用
減圧装置２４ｂ、冷蔵室用蒸発器２５ｂ、出口配管３０
は、この順に直列に接続されて、第２冷媒回路を構成し
ている。この第２冷媒回路と冷凍室用減圧装置２４ａと
は、並列に接続され、並列冷媒回路を構成している。更
には、冷蔵室側において、冷蔵室用蒸発器２５ｂから冷
蔵室３３へ空気を循環させる冷蔵室ファン２６ｂ、冷蔵
室３３内の温度を検出する冷蔵室温度センサー２８ｂ、
および冷蔵室用蒸発器２５ｂの出口温度を検出する冷蔵
室用蒸発器出口温度センサ４１ｂが設けられている。Further, the refrigerating compartment side refrigerant passage 23b, the refrigerating compartment decompressor 24b, the refrigerating compartment evaporator 25b, and the outlet pipe 30.
Are connected in series in this order to form a second refrigerant circuit. The second refrigerant circuit and the decompression device for freezer 24a are connected in parallel to form a parallel refrigerant circuit. Further, on the refrigerating compartment side, a refrigerating compartment fan 26b that circulates air from the refrigerating compartment evaporator 25b to the refrigerating compartment 33, a refrigerating compartment temperature sensor 28b that detects the temperature in the refrigerating compartment 33,
Further, a refrigerating compartment evaporator outlet temperature sensor 41b for detecting the outlet temperature of the refrigerating compartment evaporator 25b is provided.

【００２１】制御装置４０は、マイコン等で構成され、
冷凍室温度センサ２８ａ、冷蔵室温度センサ２８ｂ、冷
凍室用蒸発器出口センサ４１ａ、冷蔵室用蒸発器出口セ
ンサ４１ｂ等の各種センサの検出信号や使用者が設定す
る操作パネル（図示せず）の操作信号等に基づいて圧縮
機２１、切換弁２４、冷凍室ファン２６ａ、冷蔵室ファ
ン２６ｂ等を制御するものである。The control device 40 is composed of a microcomputer and the like,
The detection signals of various sensors such as the freezer compartment temperature sensor 28a, the refrigerator compartment temperature sensor 28b, the freezer compartment evaporator outlet sensor 41a, and the refrigerator compartment evaporator outlet sensor 41b, and the operation panel (not shown) set by the user. The compressor 21, the switching valve 24, the freezer compartment fan 26a, the refrigerating compartment fan 26b, and the like are controlled based on operation signals and the like.

【００２２】切換弁２４は、制御装置４０の制御によ
り、図２に示すように閉部が回動して冷凍室用開口Ｆ、
冷蔵室用開口Ｒ、バイパス回路用開口Ｂと第１冷媒回
路、第２冷媒回路、バイパス回路の入口側との連通を切
換えるものである。具体的には、図２（ａ）に示すよう
に冷蔵室用開口Ｒが第２冷媒回路に連通し且つ冷蔵室用
開口Ｒおよびバイパス回路用開口Ｂが閉じた冷蔵冷凍運
転状態と、図２（ｂ）に示すように冷凍室用開口Ｆが冷
凍室用減圧装置２４ａに連通し且つ冷蔵室用開口Ｒおよ
びバイパス回路用開口Ｂが閉じた冷凍運転状態と、図２
（ｃ）に示すようにバイパス回路用開口Ｂがバイパス回
路３１に連通し且つ冷蔵室用開口Ｒおよび冷凍室用開口
Ｆが閉じたバイパス開状態と、図２（ｄ）に示すように
冷凍室用開口Ｆ、冷蔵室用開口Ｒおよびバイパス回路用
開口Ｂが全て閉じた全閉状態とに切換えられる。Under the control of the control device 40, the switching valve 24 has its closed portion pivoted as shown in FIG.
The opening R for the refrigerating chamber and the opening B for the bypass circuit are switched to communicate with the first refrigerant circuit, the second refrigerant circuit, and the inlet side of the bypass circuit. Specifically, as shown in FIG. 2A, a refrigerating / freezing operation state in which the refrigerating compartment opening R communicates with the second refrigerant circuit and the refrigerating compartment opening R and the bypass circuit opening B are closed, and FIG. As shown in (b), the freezing compartment opening F communicates with the freezing compartment pressure reducing device 24a, and the refrigerating compartment opening R and the bypass circuit opening B are closed, and FIG.
As shown in FIG. 2C, the bypass circuit opening B communicates with the bypass circuit 31 and the refrigerating compartment opening R and the freezing compartment opening F are closed, and the freezing compartment as shown in FIG. 2D. The opening F for cooling, the opening R for the refrigerating compartment, and the opening B for the bypass circuit are all closed.

【００２３】この切換弁２４を用いることにより、従来
のように２個の電磁開閉弁を用いるものに比較して、一
つの切換弁の制御でよく、制御が簡単で、制御線を含め
て部品点数の少ない安価な構成とすることができる次
に、かかる冷蔵庫の動作を図３および図４を参照しなが
ら説明する。By using the switching valve 24, it is possible to control one switching valve as compared with the conventional one using two electromagnetic switching valves, the control is simple, and the parts including the control line are included. An inexpensive configuration with a small number of points can be provided. Next, the operation of the refrigerator will be described with reference to FIGS. 3 and 4.

【００２４】冷蔵庫の冷凍サイクルを稼動するために電
源を投入すると、圧縮機２１をオンすると共に（ステッ
プ５１）、切換弁２４を冷蔵冷凍運転状態とし（ステッ
プ５２）、冷凍室ファン２６ａ、冷蔵室ファン２６ｂを
オンする（ステップ５３）。これにより、切換弁２４か
ら冷蔵室用減圧装置２４ｂを通して、冷蔵室用蒸発器２
５ｂおよび冷凍室用蒸発器２５ａに冷媒が流れ、冷蔵室
ファン２６ｂおよび冷凍室ファン２６ａの運転により庫
内の空気と熱交換し冷媒液が蒸発して冷媒ガスとなる間
に周囲の熱を奪い、冷蔵室３３と冷凍室３２を同時に冷
却する。When the power is turned on to operate the refrigeration cycle of the refrigerator, the compressor 21 is turned on (step 51), the switching valve 24 is put into the refrigerating / freezing operation state (step 52), and the freezer compartment fan 26a and the refrigerating compartment are placed. The fan 26b is turned on (step 53). As a result, the cold storage evaporator 2 is passed through the switching valve 24 and the cold storage decompressor 24b.
5b and the freezer compartment evaporator 25a, the refrigerant flows, and the refrigerating compartment fan 26b and the freezer compartment fan 26a are operated to exchange heat with the air in the refrigerator to evaporate the refrigerant liquid to become the refrigerant gas and take the surrounding heat. , The refrigerator compartment 33 and the freezer compartment 32 are cooled simultaneously.

【００２５】この冷却運転中において、冷凍室温度セン
サ２８ａおよび冷蔵室温度センサ２８ｂにより冷凍室３
２および冷蔵室３３の温度を検出し（ステップ６１）、
冷凍室３２の温度が所定温度に低下しているかを判定す
る（ステップ６２）。この判定で所定温度に低下してい
る場合には、冷凍室ファン２６ａをオフして（ステップ
６４）、冷凍室３２の冷却を停止する。そして、冷蔵室
３３の温度が所定温度に低下しているかを判定する（ス
テップ６５）。この判定で、所定温度に低下していない
場合にはステップ６２に戻り、低下している場合には、
切換弁２４を全閉状態に切換え（ステップ６６）、冷蔵
室ファン２６ｂをオフし（ステップ６７）、圧縮機２１
の運転を所定時間継続して冷媒回収運転した後にオフし
て（ステップ６８）、冷凍サイクルの稼動を停止する。During this cooling operation, the freezer compartment 3 is operated by the freezer compartment temperature sensor 28a and the refrigerator compartment temperature sensor 28b.
2 and the temperature of the refrigerator compartment 33 are detected (step 61),
It is determined whether the temperature of the freezer compartment 32 has dropped to a predetermined temperature (step 62). If the temperature has dropped to the predetermined temperature in this determination, the freezer compartment fan 26a is turned off (step 64) and the cooling of the freezer compartment 32 is stopped. Then, it is determined whether the temperature of the refrigerating compartment 33 has dropped to a predetermined temperature (step 65). In this determination, if the temperature has not dropped to the predetermined temperature, the process returns to step 62, and if it has dropped,
The switching valve 24 is switched to the fully closed state (step 66), the refrigerating compartment fan 26b is turned off (step 67), and the compressor 21 is turned on.
After the refrigerant recovery operation is continued for a predetermined time, it is turned off (step 68) and the operation of the refrigeration cycle is stopped.

【００２６】このように切換弁２４を全閉状態にして圧
縮機２１の運転を所定時間継続して冷媒回収運転するこ
とにより、冷凍室用蒸発器２５ａおよび冷蔵室用蒸発器
２５ｂの冷媒を凝縮器２２内に回収することができる。
冷凍サイクルの運転を停止する際に冷媒を回収しておく
ことにより、冷凍サイクルが次に稼動して冷凍室３２お
よび冷蔵室３３の冷却運転を行なう際に、冷凍室用蒸発
器２５ａおよび冷蔵室用蒸発器２５ｂに十分な冷媒量を
直ぐに供給することができるので、冷凍室用蒸発器２５
ａおよび冷蔵室用蒸発器２５ｂのスーパーヒート（液不
足）現象を防止することができ、冷凍室３２および冷蔵
室３３の冷却を迅速に行なうことができる。これによ
り、冷凍室３２および冷蔵室３３に投入された負荷（食
品）を早く冷やすことができる。In this way, the refrigerant in the freezer compartment evaporator 25a and the refrigerating compartment evaporator 25b is condensed by operating the compressor 21 with the switching valve 24 fully closed and continuing the operation of the compressor 21 for a predetermined time. It can be collected in the container 22.
Refrigerant is recovered when the operation of the refrigeration cycle is stopped, so that the evaporator 25a for the freezing compartment and the refrigerating compartment are operated when the refrigerating cycle is operated next time to perform the cooling operation of the freezing compartment 32 and the refrigerating compartment 33. Since a sufficient amount of refrigerant can be immediately supplied to the evaporator 25b for the freezer, the evaporator 25 for the freezer compartment
It is possible to prevent the superheat (liquid shortage) phenomenon of the a and the refrigerator compartment evaporator 25b, and to quickly cool the freezing compartment 32 and the refrigerating compartment 33. Thereby, the load (food) put into the freezer compartment 32 and the refrigerator compartment 33 can be cooled quickly.

【００２７】上述したステップ６２の判定で、冷凍室３
２の温度が所定温度に低下していない場合には、冷蔵室
３３の温度が所定温度に低下しているかを判定する（ス
テップ７１）。この判定で、所定温度に低下していない
場合にはステップ６２に戻る。このように、冷凍室３２
および冷蔵室３３を運転中は、それぞれの温度が所定温
度に低下しているかを常時判定する。ステップ７１の判
定で、所定温度に低下している場合には、切換弁２４を
冷凍運転状態に切換え（ステップ７２）、冷蔵室用蒸発
器への冷媒の流れを停止する。この状態で、冷蔵室ファ
ン２６ｂの運転を継続して冷蔵室用蒸発器２５ｂの除霜
を行ない、その後に冷蔵室ファン２６ｂの運転を停止す
る（ステップ７３）。The freezing room 3 is determined by the determination in step 62 described above.
If the temperature of No. 2 has not dropped to the predetermined temperature, it is determined whether the temperature of the refrigerating compartment 33 has dropped to the predetermined temperature (step 71). In this determination, if the temperature has not dropped to the predetermined temperature, the process returns to step 62. In this way, the freezer 32
While the refrigerating room 33 is in operation, it is constantly determined whether or not each temperature has dropped to a predetermined temperature. If it is determined in step 71 that the temperature has dropped to the predetermined temperature, the switching valve 24 is switched to the freezing operation state (step 72), and the flow of the refrigerant to the refrigerator compartment evaporator is stopped. In this state, the refrigerating compartment fan 26b is continuously operated to defrost the refrigerating compartment fan 25b, and then the refrigerating compartment fan 26b is stopped (step 73).

【００２８】そして、冷凍室３２の温度が所定温度に低
下しているかを判定し（ステップ７４）、所定温度に低
下していない場合にはステップ７１に戻り、低下してい
る場合には、切換弁２４を全閉状態に切換えると共に
（ステップ７５）、冷凍室ファン２６ａをオフし（ステ
ップ７６）、圧縮機２１の運転を所定時間継続して冷媒
回収運転した後にオフして（ステップ７７）、冷凍サイ
クルの稼動を停止する。この冷媒回収運転は上述したス
テップ６８と同様である。Then, it is judged whether the temperature of the freezer compartment 32 has dropped to a predetermined temperature (step 74), and if it has not fallen to the predetermined temperature, the process returns to step 71, and if it has dropped, the switching is performed. The valve 24 is switched to the fully closed state (step 75), the freezer compartment fan 26a is turned off (step 76), the operation of the compressor 21 is continued for a predetermined time after the refrigerant recovery operation, and then turned off (step 77). Stop the operation of the refrigeration cycle. This refrigerant recovery operation is similar to step 68 described above.

【００２９】冷凍サイクルの稼動が停止すると、冷凍サ
イクル中の冷媒は温度の低い冷凍室用蒸発器内２５ａに
凝縮して溜まろうとするが、切換弁２４の全閉状態と冷
凍室用蒸発器２５ａの出口に設置された逆止弁２７とに
より、冷凍室用蒸発器２５ａおよび冷蔵室用蒸発器２５
ｂへ侵入することが出来ず、運転中に冷凍室用蒸発器２
５ａおよび冷蔵室用蒸発器２５ｂを循環していた冷媒だ
けが滞留することになる。したがって、冷蔵室３３に食
品等の新たな負荷が投入されてその温度が上昇し、圧縮
機２１の運転が開始された際に、十分な冷媒量を冷凍室
用蒸発器２５ａおよび冷蔵室用蒸発器２５ｂに供給する
ことができ、冷蔵室３３の迅速な冷却を行なうことがで
きる。When the operation of the refrigeration cycle is stopped, the refrigerant in the refrigeration cycle tries to condense and accumulate in the inside of the evaporator 25a for the freezing chamber having a low temperature, but the switching valve 24 is fully closed and the evaporator 25a for the freezing chamber is stored. And the check valve 27 installed at the outlet of the freezer compartment evaporator 25a and the refrigerator compartment evaporator 25a.
It is not possible to enter b.
Only the refrigerant circulating through 5a and the refrigerator compartment evaporator 25b will stay. Therefore, when a new load such as food is put into the refrigerating compartment 33 to raise its temperature and the operation of the compressor 21 is started, a sufficient amount of refrigerant is supplied to the freezing compartment evaporator 25a and the refrigerating compartment evaporation. It can be supplied to the container 25b, and the refrigerating chamber 33 can be rapidly cooled.

【００３０】また、圧縮機２１の運転が停止すると、凝
縮器２２の高温冷媒が冷凍室用蒸発器２５ａおよび冷蔵
室用蒸発器２５ｂに流れ込もうとするが、切換弁２４が
全閉状態に切換えられるので、凝縮器２２の高温冷媒が
冷凍室用蒸発器２５ａおよび冷蔵室用蒸発器２５ｂに流
れ込むことを防止でき、冷凍室用蒸発器２５ａおよび冷
蔵室用蒸発器２５ｂの温度上による熱負荷の増加を防止
できる。When the operation of the compressor 21 is stopped, the high temperature refrigerant of the condenser 22 tries to flow into the freezer compartment evaporator 25a and the refrigerating compartment evaporator 25b, but the switching valve 24 is fully closed. Since it is switched, the high temperature refrigerant of the condenser 22 can be prevented from flowing into the freezer compartment evaporator 25a and the refrigerator compartment evaporator 25b, and the heat load due to the temperature rise of the freezer compartment evaporator 25a and the refrigerator compartment evaporator 25b. Can be prevented from increasing.

【００３１】この冷凍サイクルの停止中においては、冷
凍室３２の温度および冷蔵室３３の温度を冷凍室温度セ
ンサ２８ａおよび冷蔵室温度センサ２８ｂにより常時検
出する（図４のステップ８１）。そして、冷凍室３２の
温度が所定温度に上昇しているかを判定する（ステップ
８２）。この判定で所定温度に上昇している場合には、
切換弁２４をバイパス開状態に切換えて所定時間この状
態を維持し、圧力バランス動作を行なわせる（ステップ
８５）。While the refrigeration cycle is stopped, the temperatures of the freezing compartment 32 and the refrigerating compartment 33 are constantly detected by the freezing compartment temperature sensor 28a and the refrigerating compartment temperature sensor 28b (step 81 in FIG. 4). Then, it is determined whether the temperature of the freezer compartment 32 has risen to a predetermined temperature (step 82). If the temperature has risen to the predetermined temperature in this judgment,
The switching valve 24 is switched to the bypass open state and maintained in this state for a predetermined time to perform the pressure balance operation (step 85).

【００３２】この圧力バランス動作は、凝縮器２２の出
口側の冷媒通路である冷媒通路２３と圧縮機２１の入口
側に接続されているバイパス回路３１とを切換弁２４の
バイパス回路用開口Ｂを介して連通し、圧縮機２１の吐
出側の冷媒が吸込側に戻されて圧力がバランスする動作
である。具体的には、凝縮器２２内の高温高圧の冷媒が
冷媒通路２３、切換弁２４のバイパス回路用開口Ｂ、バ
イパス回路３１を通して圧縮機２１の吸込側に流れ、圧
縮機２１の吐出配管２３ｃと吸込配管２９の圧力がバラ
ンスする。これにより、圧縮機２１の起動が可能とな
り、冷凍サイクルの冷却運転を開始することができる。In this pressure balancing operation, the refrigerant passage 23, which is the refrigerant passage on the outlet side of the condenser 22, and the bypass circuit 31 connected to the inlet side of the compressor 21 are connected to the bypass circuit opening B of the switching valve 24. This is an operation in which the refrigerant on the discharge side of the compressor 21 is returned to the suction side and the pressure is balanced through the communication. Specifically, the high-temperature and high-pressure refrigerant in the condenser 22 flows through the refrigerant passage 23, the bypass circuit opening B of the switching valve 24, and the bypass circuit 31 to the suction side of the compressor 21, and the discharge pipe 23c of the compressor 21. The pressure in the suction pipe 29 is balanced. As a result, the compressor 21 can be started, and the cooling operation of the refrigeration cycle can be started.

【００３３】この圧力バランス動作が終了すると、切換
弁２４を冷凍運転状態に切換え（ステップ８６）冷凍室
ファン２６ａをオンし（ステップ８７）、圧縮機２１を
オンする（ステップ８８）。これにより、第１冷媒回路
に冷媒が流れ、冷凍室３２の冷却運転が開始される。そ
して、冷蔵室３３の温度が所定温度に上昇しているかを
判定する（ステップ９０）。この判定で、所定温度に上
昇していない場合には、さらに冷凍室３２の温度が所定
温度に低下しているかを判定する（ステップ９１）。こ
の判定で、所定温度に低下している場合には、ステップ
１０６に進む。When this pressure balance operation is completed, the switching valve 24 is switched to the freezing operation state (step 86), the freezer compartment fan 26a is turned on (step 87), and the compressor 21 is turned on (step 88). As a result, the refrigerant flows into the first refrigerant circuit, and the cooling operation of the freezer compartment 32 is started. Then, it is determined whether the temperature of the refrigerating room 33 has risen to a predetermined temperature (step 90). In this determination, if the temperature has not risen to the predetermined temperature, it is further determined whether the temperature of the freezer compartment 32 has dropped to the predetermined temperature (step 91). In this determination, if the temperature has dropped to the predetermined temperature, the process proceeds to step 106.

【００３４】ステップ９０において、冷蔵室温度が所定
温度まで上昇している場合には、切換弁２４を冷蔵冷凍
状態に切換え（ステップ９６）、冷蔵室ファン２６ｂを
オンする（ステップ９７）。この状態においては、冷凍
室３２と冷蔵室３３の冷却運転が同時に行なわれること
になる。したがって、冷凍室３２と冷蔵室３３の温度状
態に合致した適切な冷却運転を行なうことができる。When the temperature of the refrigerating compartment has risen to the predetermined temperature in step 90, the switching valve 24 is switched to the refrigerating / freezing state (step 96), and the refrigerating compartment fan 26b is turned on (step 97). In this state, the cooling operation of the freezer compartment 32 and the refrigerating compartment 33 is simultaneously performed. Therefore, it is possible to perform an appropriate cooling operation that matches the temperature states of the freezer compartment 32 and the refrigerator compartment 33.

【００３５】そして、冷蔵室３３の温度が所定温度に低
下しているかを判定する（ステップ１００）。この判定
で、所定温度に低下している場合には、切換弁２４を冷
凍運転状態に切換え（ステップ１０１）、冷蔵室ファン
２６ｂの運転を継続して冷蔵室用蒸発器２５ｂの除霜を
行ない、その後に冷蔵室ファン２６ｂの運転を停止する
（ステップ１０２）。Then, it is determined whether the temperature of the refrigerating compartment 33 has dropped to a predetermined temperature (step 100). In this determination, if the temperature has dropped to the predetermined temperature, the switching valve 24 is switched to the freezing operation state (step 101), the operation of the refrigerating compartment fan 26b is continued, and the refrigerating compartment evaporator 25b is defrosted. After that, the operation of the refrigerator compartment fan 26b is stopped (step 102).

【００３６】次いで、冷凍室３２の温度が所定温度に低
下しているかを判定し（ステップ１０５）、低下してい
る場合には、切換弁２４を全閉状態に切換えると共に
（ステップ１０６）、冷凍室ファン２６ａをオフし（ス
テップ１０７）、圧縮機２１の運転を所定時間継続して
冷媒回収運転した後にオフして冷凍サイクルの稼動を停
止し（ステップ１０８）、ステップ８１に戻る。Next, it is judged whether the temperature of the freezing chamber 32 has dropped to a predetermined temperature (step 105). If it has dropped, the switching valve 24 is switched to the fully closed state (step 106), and the freezing is performed. The room fan 26a is turned off (step 107), the operation of the compressor 21 is continued for a predetermined time and the refrigerant recovery operation is performed, and then turned off to stop the operation of the refrigeration cycle (step 108), and the process returns to step 81.

【００３７】上述したステップ８２において、冷凍室３
２の室温度が所定温度に上昇していない場合には、冷蔵
室３３の温度が所定温度に上昇しているかを判定する
（ステップ１１１）。この判定で、所定温度に上昇して
いない場合にはステップ８１に戻る。また、所定温度に
上昇している場合には、切換弁２４をバイパス開状態に
切換えて所定時間この状態を維持、圧力バランス動作を
行なわせる（ステップ１１２）。この圧力バランス動作
が終了すると、切換弁２４を冷凍運転状態に切換えて第
２冷媒回路に冷媒を流すと共に（ステップ１１３）、冷
蔵室ファン２６ｂをオンする（ステップ１１４）。これ
により、冷蔵室３３の冷却運転が開始される。そして、
冷凍室３２の温度が所定温度に上昇しているかを判定す
る（ステップ１１７）。この判定で、所定温度まで上昇
している場合には、切換弁２４を冷蔵冷凍運転状態に切
換え（ステップ１１８）、冷凍室ファン２６ａをオンし
（ステップ１１９）、冷凍室３２と冷蔵室３３の冷却運
転を行い、ステップ１００に進む。In step 82 described above, the freezer compartment 3
When the chamber temperature of No. 2 has not risen to the predetermined temperature, it is determined whether the temperature of the refrigerating chamber 33 has risen to the predetermined temperature (step 111). In this determination, if the temperature has not risen to the predetermined temperature, the process returns to step 81. If the temperature has risen to the predetermined temperature, the switching valve 24 is switched to the bypass open state, this state is maintained for the predetermined time, and the pressure balancing operation is performed (step 112). When this pressure balance operation is completed, the switching valve 24 is switched to the refrigerating operation state to flow the refrigerant into the second refrigerant circuit (step 113), and the refrigerating compartment fan 26b is turned on (step 114). As a result, the cooling operation of the refrigerator compartment 33 is started. And
It is determined whether the temperature of the freezer compartment 32 has risen to a predetermined temperature (step 117). In this determination, if the temperature has risen to the predetermined temperature, the switching valve 24 is switched to the refrigerating / freezing operation state (step 118), the freezing compartment fan 26a is turned on (step 119), and the freezing compartment 32 and the refrigerating compartment 33 are turned on. The cooling operation is performed, and the process proceeds to step 100.

【００３８】かかる冷蔵庫の動作の具体的一例を図５の
タイムチャートに示す。この図５に示す例では、最初に
冷媒を冷蔵室用蒸発器２５ｂに循環させるために開口Ｒ
を開口し、続いて冷凍室用蒸発器２５ａに循環させるた
め開口Ｆを開口する。その後、冷蔵室３２、冷凍室３３
の温度が設定温度に到達すると開口Ｒ、開口Ｆを閉じ、
当初から閉塞状態の開口Ｂと合わせて全開口が閉じられ
る。ここで、一定時間圧縮機２１の運転を継続すること
により、冷凍室用蒸発器２５ａ、冷蔵室用蒸発器２５ｂ
内の冷媒は切換弁２４と逆止弁２７の中に回収した後、
圧縮機２１を停止する。その後、冷蔵庫内の温度が上昇
し所定温度に達すると、切換弁２４の開口Ｂをバイパス
回路３１に連通して圧縮機２１前後の圧力をバランスさ
せた後に、開口Ｒを第２冷媒回路に連通して圧縮機２１
を起動させる。冷蔵庫内への負荷（食品）の投入状態に
より冷凍室３３の冷却から冷蔵室３２への冷却切換え時
には一旦全開口Ｒ、Ｆ、Ｂの閉塞制御を行って冷媒を凝
縮器側に回収後に開口Ｒに切り換える。ここで冷蔵室３
２の冷却から連続して冷凍室３２の冷却切換えには冷凍
室用蒸発器２５ａの温度圧力レベルが低いために冷蔵室
側蒸発器２５ｂ内の冷媒は素早く冷凍室用蒸発器２５ａ
内に吸収され冷え遅れ（冷媒不足）現象は生じにくい。A specific example of the operation of such a refrigerator is shown in the time chart of FIG. In the example shown in FIG. 5, the opening R is first provided in order to circulate the refrigerant through the refrigerator compartment evaporator 25b.
Is opened, and then the opening F is opened for circulation to the freezer compartment evaporator 25a. Then, the refrigerator compartment 32 and the freezer compartment 33
When the temperature reaches the set temperature, the openings R and F are closed,
From the beginning, all the openings are closed together with the opening B in the closed state. Here, by continuing the operation of the compressor 21 for a certain period of time, the evaporator 25a for the freezing compartment and the evaporator 25b for the refrigerating compartment
After collecting the refrigerant in the switching valve 24 and the check valve 27,
The compressor 21 is stopped. After that, when the temperature in the refrigerator rises and reaches a predetermined temperature, the opening B of the switching valve 24 is communicated with the bypass circuit 31 to balance the pressure around the compressor 21, and then the opening R is communicated with the second refrigerant circuit. Then the compressor 21
To start. When the cooling of the freezer compartment 33 is switched to the refrigerating compartment 32 due to the state of the load (food) in the refrigerator, all the openings R, F, B are once closed and the refrigerant is recovered to the condenser side, and the opening R is opened. Switch to. Refrigerating room 3 here
When the cooling of the freezer compartment 32 is continuously switched from the cooling of 2, the temperature inside the evaporator 25a for the freezer compartment is low, so that the refrigerant in the evaporator 25b on the refrigerator compartment is quickly cooled.
The phenomenon of being delayed in cooling (insufficient refrigerant) does not easily occur.

【００３９】[0039]

【発明の効果】本発明によれば、部品点数の少ない安価
な構成で、冷却開始時に冷蔵室および冷蔵室の冷却速度
を早くできると共に冷却運転停止時に熱負荷の増加を防
止でき、冷凍サイクルの効率を向上して消費電力量の低
減を図ることができる冷蔵庫を提供することができる。According to the present invention, it is possible to increase the cooling speed of the refrigerating chamber and the refrigerating chamber at the start of cooling and to prevent an increase in heat load at the time of stopping the cooling operation with an inexpensive structure having a small number of parts, and to prevent an increase in the refrigerating cycle. A refrigerator that can improve efficiency and reduce power consumption can be provided.

【００４０】本発明によれば、部品点数の少ない安価な
構成で、冷却開始時に冷蔵室および冷蔵室の冷却速度を
早くできると共に冷却運転停止時に熱負荷の増加を防止
でき、冷凍サイクルの効率を向上して消費電力量の低減
を図ることができ、しかも圧縮機の起動が容易な冷蔵庫
を提供することができる。According to the present invention, it is possible to increase the cooling rate of the refrigerating chamber and the refrigerating chamber at the start of cooling and prevent an increase in heat load at the time of stopping the cooling operation with an inexpensive structure having a small number of parts, thereby improving the efficiency of the refrigeration cycle. It is possible to provide a refrigerator in which the power consumption can be improved and the compressor can be started easily.

【００４１】本発明によれば、部品点数の少ない安価な
構成で、冷凍室および冷蔵室を独立して同時および単独
に冷却することができると共に冷蔵室の冷却運転停止時
に冷蔵室ファンによる除霜運転をすることができ、さら
に冷却開始時に冷凍室および冷蔵室の冷却速度を早くで
きると共に冷却運転停止時に熱負荷の増加を防止でき、
冷凍サイクルの効率を向上して消費電力量の低減を図る
ことができ、しかも圧縮機の起動が容易な冷蔵庫を提供
することができる。According to the present invention, it is possible to independently and simultaneously cool the freezing compartment and the refrigerating compartment with an inexpensive structure having a small number of parts, and defrost by the refrigerating compartment fan when the cooling operation of the refrigerating compartment is stopped. It is possible to operate, it is possible to increase the cooling speed of the freezer compartment and the refrigerating compartment at the start of cooling, and to prevent an increase in heat load when the cooling operation is stopped,
It is possible to provide a refrigerator in which the efficiency of the refrigeration cycle can be improved to reduce the power consumption and the compressor can be easily started.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の第１実施例の冷蔵庫の冷凍サイクル構
成図である。FIG. 1 is a configuration diagram of a refrigeration cycle of a refrigerator according to a first embodiment of the present invention.

【図２】同冷凍サイクルに用いる切換弁の切換動作説明
図である。FIG. 2 is an explanatory diagram of a switching operation of a switching valve used in the refrigeration cycle.

【図３】同冷蔵庫の動作フローチャート図である。FIG. 3 is an operation flowchart of the refrigerator.

【図４】同冷蔵庫の動作フローチャート図（続き）であ
る。FIG. 4 is an operation flowchart diagram (continuation) of the refrigerator.

【図５】同冷蔵庫の動作例のタイムチャート図である。FIG. 5 is a time chart diagram of an operation example of the refrigerator.

【符号の説明】[Explanation of symbols]

２１…圧縮機、２２…凝縮器、２３…冷媒通路、２４…
切換弁、２４ａ…冷凍室用減圧装置、２４ｂ…冷蔵室用
減圧装置、２５ａ…冷凍室用蒸発器、２５ｂ…冷蔵室用
蒸発器、２６ａ…冷凍室ファン、２６ｂ…冷蔵室ファ
ン、２７…逆止弁、２８ａ…冷凍室温度センサ、２８ｂ
…冷蔵室温度センサ、２９…吸込配管、３０…出口配
管、３１…バイパス回路、３２…冷凍室、３３…冷蔵
室、３４…冷蔵庫箱体、４０…制御装置、４１ａ…冷凍
室用蒸発器出口温度センサ、４１ｂ…冷蔵室用蒸発器出
口温度センサ。21 ... Compressor, 22 ... Condenser, 23 ... Refrigerant passage, 24 ...
Switching valve, 24a ... Freezer decompression device, 24b ... Refrigerator decompression device, 25a ... Freezer evaporator, 25b ... Refrigerator evaporator, 26a ... Freezer fan, 26b ... Refrigerator fan, 27 ... Reverse Stop valve, 28a ... Freezer temperature sensor, 28b
Refrigerator temperature sensor, 29 ... Suction pipe, 30 ... Outlet pipe, 31 ... Bypass circuit, 32 ... Freezer compartment, 33 ... Refrigerator compartment, 34 ... Refrigerator box, 40 ... Control device, 41a ... Freezer compartment evaporator outlet Temperature sensor, 41b ... Evaporator outlet temperature sensor for cold room.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 小松 利広 栃木県下都賀郡大平町大字富田800番地 株式会社日立製作所冷熱事業部内 (72)発明者 中村 英幸 栃木県下都賀郡大平町大字富田800番地 株式会社日立製作所冷熱事業部内 (72)発明者 松嶋 弘章 茨城県土浦市神立町502番地 株式会社日 立製作所機械研究所内 Ｆターム(参考） 3L045 AA01 AA02 AA03 BA01 CA02 DA02 EA01 GA07 HA02 HA08 JA01 JA15 LA06 LA09 LA17 MA02 MA12 PA01 PA03 PA04 PA05    ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshihiro Komatsu             800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi             Hitachi Co., Ltd., Cooling & Heat Division (72) Inventor Hideyuki Nakamura             800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi             Hitachi Co., Ltd., Cooling & Heat Division (72) Inventor Hiroaki Matsushima             502 Kintatemachi, Tsuchiura City, Ibaraki Japan             Tate Seisakusho Mechanical Research Center F term (reference) 3L045 AA01 AA02 AA03 BA01 CA02                       DA02 EA01 GA07 HA02 HA08                       JA01 JA15 LA06 LA09 LA17                       MA02 MA12 PA01 PA03 PA04                       PA05

Claims (8)

【特許請求の範囲】[Claims] 【請求項１】圧縮機と、凝縮器と、冷凍室用減圧装置、
冷凍室用蒸発器および逆止弁を順に直列に接続した第１
冷媒回路と、冷蔵室用減圧装置および冷蔵室用蒸発器を
順に直列に接続した第２冷媒回路とを有する冷凍サイク
ルを備えると共に、前記冷凍サイクルを制御する制御装
置を備えた冷蔵庫において、 前記冷凍サイクルは、前記凝縮器の出口側と前記圧縮機
の入口側との間に前記第1冷媒回路を接続し、前記冷凍
室用減圧装置および前記第２冷媒回路を並列に接続して
並列冷媒回路を形成し、この並列回路の入口側分岐部に
切換弁を設け、前記切換弁と前記圧縮機の入口側とを連
通するバイパス回路を設け、 前記切換弁は、前記並列冷媒回路および前記バイパス回
路への選択的連通と、前記並列冷媒回路および前記バイ
パス回路への同時閉鎖との状態に切換え可能な一つの弁
で構成し、 前記制御装置は、前記圧縮機を停止した状態で、前記切
換弁を前記並列冷媒回路および前記バイパス回路への同
時閉鎖の状態に制御することを特徴とする冷蔵庫。1. A compressor, a condenser, a decompression device for a freezer,
First evaporator with freezer compartment evaporator and check valve connected in series
A refrigerating cycle having a refrigerant circuit and a second refrigerant circuit in which a refrigerating chamber decompressor and a refrigerating chamber evaporator are sequentially connected in series, and a refrigerator provided with a control device for controlling the refrigerating cycle, In the cycle, the first refrigerant circuit is connected between the outlet side of the condenser and the inlet side of the compressor, and the decompression device for the freezer compartment and the second refrigerant circuit are connected in parallel to form a parallel refrigerant circuit. A switching valve is provided at the inlet side branch portion of the parallel circuit, and a bypass circuit is provided that connects the switching valve and the inlet side of the compressor, and the switching valve is the parallel refrigerant circuit and the bypass circuit. And a single valve that can be switched to a state in which the parallel refrigerant circuit and the bypass circuit are simultaneously closed, and the control device has the switching valve in a state in which the compressor is stopped. Is controlled so that the parallel refrigerant circuit and the bypass circuit are simultaneously closed. 【請求項２】請求項１において、前記制御装置は、前記
冷凍室用蒸発器が冷却する冷凍室の温度が所定温度に低
下し且つ前記冷蔵室用蒸発器が冷却する冷蔵室の温度が
所定温度に低下していないときに前記切換弁を第２冷媒
回路に連通する状態とし、前記冷蔵室の温度が所定温度
に低下し且つ前記冷凍室の温度が所定温度に低下してい
ないときに前記切換弁を前記冷凍室用減圧装置に連通す
る状態とし、前記冷凍室および前記冷蔵室が所定温度に
低下しているときに前記切換弁を前記並列冷媒回路に閉
鎖する状態とするように制御することを特徴とする冷蔵
庫。2. The control device according to claim 1, wherein the temperature of the freezer compartment cooled by the evaporator for the freezer compartment drops to a predetermined temperature and the temperature of the refrigerating compartment cooled by the evaporator for the refrigerator compartment is predetermined. When the temperature has not dropped to the temperature, the switching valve is brought into a state of communicating with the second refrigerant circuit, and when the temperature of the refrigerating chamber has dropped to a predetermined temperature and the temperature of the freezing chamber has not dropped to the predetermined temperature, The switching valve is brought into communication with the decompression device for the freezing compartment, and the switching valve is controlled to be closed to the parallel refrigerant circuit when the freezing compartment and the refrigerating compartment are cooled to a predetermined temperature. A refrigerator characterized by that. 【請求項３】請求項１において、前記冷蔵室用蒸発器の
冷気を冷蔵室に通風する冷蔵室ファンを備え、前記制御
装置は、前記切換弁を前記冷凍室用減圧装置に連通し且
つ前記第２冷媒回路に閉鎖した状態としているときに、
前記冷蔵室ファンを運転するように制御することを特徴
とする冷蔵庫。3. The refrigerating compartment fan for ventilating the cold air of the refrigerating compartment evaporator to the refrigerating compartment as claimed in claim 1, wherein the controller communicates the switching valve with the decompressor for the freezing compartment and When the second refrigerant circuit is closed,
A refrigerator characterized in that the refrigerator fan is controlled to operate. 【請求項４】圧縮機と、凝縮器と、冷凍室用減圧装置、
冷凍室用蒸発器および逆止弁を順に直列に接続した第１
冷媒回路と、冷蔵室用減圧装置および冷蔵室用蒸発器を
順に直列に接続した第２冷媒回路とを有する冷凍サイク
ルを備えると共に、前記冷凍サイクルを制御する制御装
置を備えた冷蔵庫において、 前記冷凍サイクルは、前記凝縮器の出口側と前記圧縮機
の入口側との間に前記第1冷媒回路を接続し、前記冷凍
室用減圧装置および前記第２冷媒回路を並列に接続して
並列冷媒回路を形成し、この並列回路の入口側分岐部に
切換弁を設け、前記切換弁と前記圧縮機の入口側とを連
通するバイパス回路を設け、 前記切換弁は、前記並列冷媒回路および前記バイパス回
路への選択的連通と、前記並列冷媒回路および前記バイ
パス回路への同時閉鎖との状態に切換え可能な一つの弁
で構成し、 前記制御装置は、前記切換弁を前記並列冷媒回路および
バイパス回路への同時閉鎖の状態で前記圧縮機を所定時
間運転するように制御することを特徴とする冷蔵庫。4. A compressor, a condenser, a decompression device for a freezer compartment,
First evaporator with freezer compartment evaporator and check valve connected in series
A refrigerating cycle having a refrigerant circuit and a second refrigerant circuit in which a refrigerating chamber decompressor and a refrigerating chamber evaporator are sequentially connected in series, and a refrigerator provided with a control device for controlling the refrigerating cycle, In the cycle, the first refrigerant circuit is connected between the outlet side of the condenser and the inlet side of the compressor, and the decompression device for the freezer compartment and the second refrigerant circuit are connected in parallel to form a parallel refrigerant circuit. A switching valve is provided at the inlet side branch portion of the parallel circuit, and a bypass circuit is provided that connects the switching valve and the inlet side of the compressor, and the switching valve is the parallel refrigerant circuit and the bypass circuit. To the parallel refrigerant circuit and the bypass circuit at the same time can be switched to a state of being simultaneously closed, the control device, the control device, the switching valve the parallel refrigerant circuit and the bypass. A refrigerator characterized in that the compressor is controlled so as to operate for a predetermined time in a state where the pass circuits are simultaneously closed. 【請求項５】請求項４において、前記制御装置は、前記
切換弁を前記並列冷媒回路およびバイパス回路への同時
閉鎖の状態に切換えた直後に前記圧縮機を短時間だけ継
続して運転するように制御することを特徴とする冷蔵
庫。5. The control device according to claim 4, wherein the control device continuously operates the compressor for a short period of time immediately after switching the switching valve to a state in which the parallel refrigerant circuit and the bypass circuit are simultaneously closed. Refrigerator characterized by controlling to. 【請求項６】圧縮機と、凝縮器と、冷凍室用減圧装置、
冷凍室用蒸発器および逆止弁を順に直列に接続した第１
冷媒回路と、冷蔵室用減圧装置および冷蔵室用蒸発器を
順に直列に接続した第２冷媒回路とを有する冷凍サイク
ルを備えると共に、前記冷凍サイクルを制御する制御装
置を備えた冷蔵庫において、 前記冷凍サイクルは、前記凝縮器の出口側と前記圧縮機
の入口側との間に前記第1冷媒回路を接続し、前記冷凍
室用減圧装置および前記第２冷媒回路を並列に接続して
並列冷媒回路を形成し、この並列回路の入口側分岐部に
切換弁を設け、前記切換弁と前記圧縮機の入口側とを連
通するバイパス回路を設け、 前記切換弁は、前記並列冷媒回路および前記バイパス回
路への選択的連通と、前記並列冷媒回路および前記バイ
パス回路への同時閉鎖との状態に切換え可能な一つの弁
で構成し、 前記制御装置は、前記切換弁を前記並列冷媒回路への同
時閉鎖の状態に切換えてから前記並列冷媒回路への選択
的連通の状態に切換える間に、前記切換弁を前記バイパ
ス回路への選択的連通の状態に所定時間切換えるように
制御することを特徴とする冷蔵庫。6. A compressor, a condenser, a decompression device for a freezer compartment,
First evaporator with freezer compartment evaporator and check valve connected in series
A refrigerating cycle having a refrigerant circuit and a second refrigerant circuit in which a refrigerating chamber decompressor and a refrigerating chamber evaporator are sequentially connected in series, and a refrigerator provided with a control device for controlling the refrigerating cycle, In the cycle, the first refrigerant circuit is connected between the outlet side of the condenser and the inlet side of the compressor, and the decompression device for the freezer compartment and the second refrigerant circuit are connected in parallel to form a parallel refrigerant circuit. A switching valve is provided at the inlet side branch portion of the parallel circuit, and a bypass circuit is provided that connects the switching valve and the inlet side of the compressor, and the switching valve is the parallel refrigerant circuit and the bypass circuit. To the parallel refrigerant circuit and the bypass circuit at the same time can be switched to the state of switching to one of the valves, the control device, the control device, the switching valve simultaneous closing of the parallel refrigerant circuit The switching valve is controlled to switch to a state of selective communication to the bypass circuit for a predetermined time while switching to a state of chain and then to a state of selective communication to the parallel refrigerant circuit. refrigerator. 【請求項７】請求項６において、前記制御装置は、前記
切換弁を前記並列冷媒回路への同時閉鎖の状態から前記
並列冷媒回路への選択的連通の状態に移行する直前に、
前記切換弁を前記バイパス回路への連通の状態に短時間
切換えてから移行するように制御することを特徴とする
冷蔵庫。7. The control device according to claim 6, wherein, immediately before shifting the switching valve from a state in which the switching valve is simultaneously closed to the parallel refrigerant circuit to a state in which it is in selective communication with the parallel refrigerant circuit,
A refrigerator characterized in that the switching valve is controlled to switch to a state of communication with the bypass circuit for a short time and then to shift. 【請求項８】圧縮機と、凝縮器と、冷凍室用減圧装置、
冷凍室用蒸発器および逆止弁を順に直列に接続した第１
冷媒回路と、冷蔵室用減圧装置および冷蔵室用蒸発器を
順に直列に接続した第２冷媒回路とを有する冷凍サイク
ルを備えると共に、前記冷凍サイクルを制御する制御装
置および前記冷蔵室用蒸発器の冷気を冷蔵室に通風する
冷蔵室ファンを備えた冷蔵庫において、 前記冷凍サイクルは、前記凝縮器の出口側と前記圧縮機
の入口側との間に前記第1冷媒回路を接続し、前記冷凍
室用減圧装置および前記第２冷媒回路を並列に接続して
並列冷媒回路を形成し、この並列回路の入口側分岐部に
切換弁を設け、前記切換弁と前記圧縮機の入口側とを連
通するバイパス回路を設け、 前記切換弁は、前記並列冷媒回路および前記バイパス回
路への選択的連通と、前記並列冷媒回路および前記バイ
パス回路への同時閉鎖との状態に切換え可能な一つの弁
で構成し、 前記制御装置は、前記圧縮機を停止した状態で、前記切
換弁を前記並列冷媒回路および前記バイパス回路への同
時閉鎖の状態に制御し、前記切換弁を前記冷凍室用減圧
装置に連通し且つ前記第２冷媒回路に閉鎖した状態とし
ているときに、前記冷蔵室ファンを運転するように制御
し、前記切換弁を前記並列冷媒回路およびバイパス回路
への同時閉鎖の状態に切換えた直後に前記圧縮機を短時
間だけ継続して運転するように制御し、前記切換弁を前
記並列冷媒回路への同時閉鎖の状態から前記並列冷媒回
路への選択的連通の状態に移行する直前に前記切換弁を
前記バイパス回路への選択的連通の状態に短時間切換え
てから移行するように制御することを特徴とする冷蔵
庫。8. A compressor, a condenser, a decompression device for a freezer compartment,
First evaporator with freezer compartment evaporator and check valve connected in series
A refrigerating cycle having a refrigerant circuit and a second refrigerant circuit in which a refrigerating chamber depressurizing device and a refrigerating chamber evaporator are sequentially connected in series is provided, and a control device for controlling the refrigerating cycle and the refrigerating chamber evaporator are provided. In a refrigerator equipped with a refrigerating compartment fan that ventilates cold air into a refrigerating compartment, the refrigeration cycle connects the first refrigerant circuit between the outlet side of the condenser and the inlet side of the compressor, and the refrigerating compartment. Pressure reducing device and the second refrigerant circuit are connected in parallel to form a parallel refrigerant circuit, a switching valve is provided at an inlet side branch portion of the parallel circuit, and the switching valve communicates with the inlet side of the compressor. A bypass circuit is provided, and the switching valve is a single valve capable of switching between a state in which the parallel refrigerant circuit and the bypass circuit are selectively communicated and a state in which the parallel refrigerant circuit and the bypass circuit are simultaneously closed. Then, the control device controls the switching valve to a state of simultaneously closing the parallel refrigerant circuit and the bypass circuit in a state where the compressor is stopped, and connects the switching valve to the decompression device for the freezer compartment. And, when the second refrigerant circuit is in the closed state, it is controlled to operate the refrigerating compartment fan, and immediately after the switching valve is switched to the state in which the parallel refrigerant circuit and the bypass circuit are simultaneously closed. The compressor is controlled so as to be continuously operated only for a short time, and the switching valve is switched immediately before the switching valve is switched from the simultaneous closed state to the parallel refrigerant circuit to the selective communication state to the parallel refrigerant circuit. A refrigerator characterized in that the valve is controlled to switch to a state of selective communication with the bypass circuit for a short time and then to shift.