JP2986664B2

JP2986664B2 - Refrigeration equipment

Info

Publication number: JP2986664B2
Application number: JP5258486A
Authority: JP
Inventors: 覚長谷川; 浩二土橋; 宏若松
Original assignee: Consejo Superior de Investigaciones Cientificas CSIC
Current assignee: Consejo Superior de Investigaciones Cientificas CSIC
Priority date: 1993-10-15
Filing date: 1993-10-15
Publication date: 1999-12-06
Anticipated expiration: 2014-12-06
Also published as: JPH07110179A

Description

DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は、冷媒としてハイドロフ
ルオロカーボン１３４ａが用いられたオイルの析出を防
止する冷蔵庫等の冷凍装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus such as a refrigerator for preventing the precipitation of oil using hydrofluorocarbon 134a as a refrigerant.

【０００２】[0002]

【従来の技術】一般に、冷蔵庫等の冷凍装置における冷
媒としては、クロロフルオロカーボン（以下、ＣＦＣと
称す）１２が用いられていた。このＣＦＣ１２を冷媒と
する従来の冷蔵庫の冷凍サイクルを図１４に示す。図１
４において、１は圧縮機、２は凝縮器、３はドライヤ、
４は絞り弁装置であるキャピラリチューブ、５は蒸発
器、６は吸入管である。そして、圧縮機１により圧縮さ
れた高温・高圧のガス冷媒は、凝縮器２により冷却され
て中温・高圧の液冷媒となる。液冷媒はドライヤ３によ
り水分等の不純物が取り除かれ、キャピラリチューブ４
を通過することにより減圧され、蒸発器５の入口での急
激な圧力低下により蒸発して低温・低圧のガス冷媒とな
る。このガス冷媒は吸入管６を通過することにより加熱
されて中温・低圧のガス冷媒となり、圧縮機１に吸収さ
れて再び高温・高圧のガス冷媒となって吐出する。2. Description of the Related Art Generally, chlorofluorocarbon (hereinafter referred to as CFC) 12 has been used as a refrigerant in a refrigerating apparatus such as a refrigerator. FIG. 14 shows a refrigeration cycle of a conventional refrigerator using the CFC 12 as a refrigerant. FIG.
In 4, 1 is a compressor, 2 is a condenser, 3 is a dryer,
Reference numeral 4 denotes a capillary tube as a throttle valve device, 5 denotes an evaporator, and 6 denotes a suction pipe. The high-temperature and high-pressure gas refrigerant compressed by the compressor 1 is cooled by the condenser 2 to become a medium-temperature and high-pressure liquid refrigerant. The liquid refrigerant is subjected to removal of impurities such as moisture by the dryer 3 and the capillary tube 4
, And evaporates due to a rapid pressure drop at the inlet of the evaporator 5 to become a low-temperature and low-pressure gas refrigerant. This gas refrigerant is heated by passing through the suction pipe 6 to become a medium-temperature and low-pressure gas refrigerant, absorbed by the compressor 1 and discharged again as a high-temperature and high-pressure gas refrigerant.

【０００３】このような冷凍サイクルを構成する各部材
のパイプおよび各部材を接続する配管パイプ７として
は、銅製、鉄製またはアルミニウム製のパイプ類が使用
されており、これらのパイプ類の製造にはパラフィン系
のプレスオイルが使用されていため、これらパイプ類の
内壁にプレスオイルが付着していることがよくある。こ
のため、付着したプレスオイルが冷媒や圧縮機油に溶け
て冷凍サイクル内を循環し、キャピラリチューブ４の出
口側のような低温かつパイプ内径の小さな箇所で二層分
離して固化（ワックス化）し、パイプ詰まりを引き起こ
して冷媒の循環を妨げる可能性があると考えられる。し
かしながら、プレスオイルは従来の冷媒であるＣＦＣ１
２およびＣＦＣ１２用圧縮機油との低温時での相溶性が
良く、通常の冷蔵庫における蒸発器５の温度程度ではＣ
ＦＣ１２やＣＦＣ１２用圧縮機油から二層分離して固化
することがない。したがって、従来においては、パイプ
類に付着したプレスオイルについてそれほど問題視され
ていなかった。[0003] Pipes made of copper, iron or aluminum are used as pipes of each member constituting such a refrigeration cycle and piping pipes 7 for connecting the respective members. Since paraffinic press oil is used, the press oil often adheres to the inner walls of these pipes. For this reason, the adhered press oil is dissolved in the refrigerant or the compressor oil and circulates in the refrigeration cycle, and is separated into two layers at a low temperature and a small pipe inner diameter such as the outlet side of the capillary tube 4 to be solidified (waxed). It is conceivable that this may cause clogging of the pipe and hinder the circulation of the refrigerant. However, press oil is a conventional refrigerant CFC1
2 and good compatibility with compressor oil for CFC12 at low temperature.
It does not separate into two layers from the compressor oil for FC12 and CFC12 and solidifies. Therefore, hitherto, the press oil attached to the pipes has not been regarded as a problem.

【０００４】[0004]

【発明が解決しようとする課題】しかしながら、従来の
冷蔵庫に使用されているＣＦＣ１２は塩素を含むため、
大気中に放出されるとオゾン層を破壊する可能性があ
り、地球温暖化の原因になると指摘されている。このた
め、地球環境の保護の風潮に反するＣＦＣ１２の使用が
規制されるようになってきた。このようなＣＦＣ１２に
代わる冷蔵庫の冷媒として、塩素を含まないハイドロフ
ルオロカーボン（以下、ＨＦＣと称す）１３４ａが取り
上げられている。However, since the CFC 12 used in the conventional refrigerator contains chlorine,
It has been pointed out that if released into the atmosphere, it may destroy the ozone layer, causing global warming. For this reason, the use of CFCs 12 that is against the trend of protecting the global environment has been regulated. A chlorine-free hydrofluorocarbon (hereinafter, referred to as HFC) 134a is taken up as a refrigerant for a refrigerator replacing the CFC 12.

【０００５】しかし、このＨＦＣ１３４ａおよびＨＦＣ
１３４ａ用圧縮機油は、上述のパイプ類に付着したプレ
スオイルとの低温時での相溶性が著しく悪いため、キャ
ピラリチューブ４の出口側で二層分離して固化（ワック
ス化）し、パイプ詰まりを引き起して冷却不良を起こす
ことが問題視されている。However, HFC134a and HFC134a
Since the 134a compressor oil has extremely poor compatibility with the above-mentioned press oil attached to the pipes at a low temperature, it is separated into two layers at the outlet side of the capillary tube 4 and solidified (waxed) to prevent clogging of the pipe. It is regarded as a problem to cause the cooling failure by causing it.

【０００６】そこで、予めパイプ類に付着しているプレ
スオイルを洗浄して除去することが考えられるが、洗浄
剤そのものが規制されているＣＦＣ１１３等であるため
使用できないといった問題がある。また、洗浄剤には通
常塩素が含有されており、この塩素がＨＦＣ１３４ａ用
圧縮機油と反応して塩素含有化合物が析出して、パイプ
詰まりを起こしてしまう。したがって、現状ではパイプ
類作成時のプレスオイル量の削減、プレスオイルとなる
材料の選定によってのみ対応しているが、冷凍サイクル
内に混在してもパイプ詰まり等の問題のないレベルまで
プレスオイルの残渣を減ずることは非常に困難である。Therefore, it is conceivable to wash and remove the press oil adhering to the pipes in advance, but there is a problem that the cleaning agent itself cannot be used because it is a regulated CFC113 or the like. Further, the cleaning agent usually contains chlorine, and this chlorine reacts with the compressor oil for HFC134a to precipitate a chlorine-containing compound, which causes pipe clogging. Therefore, at present, measures are taken only by reducing the amount of press oil when creating pipes and selecting the material to be used as the press oil. It is very difficult to reduce the residue.

【０００７】本発明は、上記に鑑み、プレスオイルの析
出によるパイプ詰まり等を防止できるＨＦＣ１３４ａを
使用した冷凍装置の提供を目的とする。[0007] In view of the above, an object of the present invention is to provide a refrigeration system using HFC134a which can prevent clogging of a pipe due to deposition of press oil.

【０００８】[0008]

【課題を解決するための手段】本発明請求項１による課
題解決手段は、図１，２の如く、冷媒としてハイドロフ
ルオロカーボン１３４ａが用いられた冷凍装置におい
て、キャピラリチューブ２３の入口側に、配管２６内に
存在するオイルを冷媒から分離して溜めるオイル溜め器
２７が設けられたものである。Means for Solving the Problems According to the first aspect of the present invention, as shown in FIGS. 1 and 2, in a refrigerating apparatus using a hydrofluorocarbon 134a as a refrigerant, a pipe 26 is provided at an inlet side of a capillary tube 23. An oil sump 27 is provided for separating and accumulating oil present in the refrigerant from the refrigerant.

【０００９】請求項２，３による課題解決手段は、図３
の如く、蒸発器２４の一部に、オイル溜め器３０が設け
られ、該オイル溜め器３０を冷却する電子冷凍素子が用
いられた冷却装置３１が設けられたものである。The means for solving the problems according to claims 2 and 3 is shown in FIG.
As described above, an oil reservoir 30 is provided in a part of the evaporator 24, and a cooling device 31 using an electronic refrigeration element for cooling the oil reservoir 30 is provided.

【００１０】請求項４による課題解決手段は、図４の如
く、オイル溜め器３０を断熱する断熱体３５が設けられ
たものである。According to a fourth aspect of the present invention, as shown in FIG. 4, a heat insulator 35 for insulating the oil reservoir 30 is provided.

【００１１】請求項５による課題解決手段は、キャピラ
リチューブ２３の冷媒入口側に析出したオイルを溶解す
るための加熱ヒータ４０と、冷凍サイクル内を循環する
オイルの析出量が正常な冷媒循環を妨げる量となる時間
よりも短い基準時間が経過すると加熱ヒータ４０を作動
制御する制御手段４１とが設けられたものである。[0011] SUMMARY According to claim 5, to dissolve the oil deposited on the refrigerant inlet side of the key Yapira <br/> Richubu 23
And because of the heater 40, circulating in the refrigeration cycle
Time during which the amount of deposited oil is such that it prevents normal refrigerant circulation
Activates the heater 40 when a shorter reference time elapses
And a control means 41 for performing control.

【００１２】請求項６，７による課題解決手段は、図６
の如く、キャピラリチューブ２３の長さを可変する長さ
可変手段４３と、圧縮機２０の駆動時間に応じてキャピ
ラリチューブ２３の長さを小とする制御手段４４とが設
けられ、長さ可変手段４３は、キャピラリチューブ２３
に直列に接続された補助キャピラリチューブ４５と、該
補助キャピラリチューブ４５に対して並列に形成された
パイパス流路４６と、冷媒を補助キャピラリチューブ４
５あるいはパイパス流路４６に導く切換弁４７とを備え
たものである。The problem solving means according to claims 6 and 7 is shown in FIG.
The length varying means 43 for varying the length of the capillary tube 23 and the control means 44 for decreasing the length of the capillary tube 23 according to the driving time of the compressor 20 are provided. 43 is a capillary tube 23
An auxiliary capillary tube 45 connected in series to the auxiliary capillary tube 45; a bypass passage 46 formed in parallel with the auxiliary capillary tube 45;
5 or a switching valve 47 for guiding to the bypass flow path 46.

【００１３】請求項８，９による課題解決手段は、図７
の如く、キャピラリチューブ２３の内径を可変する内径
可変手段５０と、圧縮機２０の駆動時間に応じてキャピ
ラリチューブ２３の内径を大とする制御手段５１とが設
けられ、内径可変手段５０は、キャピラリチューブ２３
に並列に接続されキャピラリチューブ２３よりも内径が
大である副キャピラリチューブ５２と、冷媒をキャピラ
リチューブ２３あるいは副キャピラリチューブ５２に導
く切換弁５３とを備えたものである。The means for solving the problems according to claims 8 and 9 is shown in FIG.
As described above, there is provided an inner diameter varying means 50 for varying the inner diameter of the capillary tube 23, and a control means 51 for increasing the inner diameter of the capillary tube 23 in accordance with the driving time of the compressor 20. Tube 23
A sub-capillary tube 52 having an inner diameter larger than that of the capillary tube 23 and a switching valve 53 for guiding the refrigerant to the capillary tube 23 or the sub-capillary tube 52.

【００１４】請求項１０，１１による課題解決手段は、
図８の如く、圧縮機２０で圧縮されたガス冷媒を蒸発器
２４からキャピラリチューブ２３を経て凝縮器２１に逆
循環させる冷媒逆循環手段６０と、圧縮機２０の駆動時
間に応じて冷媒逆循環手段６０を作動させる制御手段６
１とが設けられ、冷媒逆循環手段６０は、圧縮機２０の
出口側から蒸発器２４の出口側に接続された第一バイパ
ス６２と、凝縮器２１の入口側から圧縮機２０の入口側
に接続された第二バイパス６３と、前記第一バおよび第
二バイパス６２，６３の接続部分に設けられた複数の切
換弁６４ａ，６４ｂ，６４ｃ，６４ｄとを備えたもので
ある。[0014] The means for solving the problems according to claims 10 and 11 is as follows.
As shown in FIG. 8, a refrigerant recirculation means 60 for recirculating the gas refrigerant compressed by the compressor 20 from the evaporator 24 to the condenser 21 via the capillary tube 23, and a refrigerant recirculation according to the driving time of the compressor 20. Control means 6 for activating means 60
1 is provided, the refrigerant reverse circulation means 60 is connected to the first bypass 62 connected from the outlet side of the compressor 20 to the outlet side of the evaporator 24, and from the inlet side of the condenser 21 to the inlet side of the compressor 20. It has a second bypass 63 connected thereto, and a plurality of switching valves 64a, 64b, 64c, 64d provided at a connection portion between the first bar and the second bypasses 62, 63.

【００１５】請求項１２による課題解決手段は、図９の
如く、キャピラリチューブ２３の入口側あるいは出口側
の温度を検知する温度センサ７１と、キャピラリチュー
ブ２３の入口側あるいは出口側の温度が所定の温度以下
になると冷却ファン７０の風量を上げる制御手段７２と
が設けられたものである。As shown in FIG. 9, the problem solving means according to claim 12 comprises a temperature sensor 71 for detecting the temperature on the inlet side or the outlet side of the capillary tube 23, and the temperature on the inlet side or the outlet side of the capillary tube 23 being a predetermined value. A control means 72 for increasing the air volume of the cooling fan 70 when the temperature becomes lower than the temperature is provided.

【００１６】請求項１３，１４による課題解決手段は、
図１０の如く、温度センサ７１と、凝縮器２１の容量を
可変する容量可変手段８０と、キャピラリチューブ２３
の入口側あるいは出口側の温度が所定の温度以下になる
と凝縮器２１の容量を小とする制御手段８１とが設けら
れ、容量可変手段８０は、凝縮器２１に直列に接続され
た補助凝縮器８２と、該補助凝縮器８２に対して並列に
形成されたパイパス流路８３と、補助凝縮器８２とパイ
パス流路８３との接続部分に設けられた切換弁８４ａ，
８４ｂとを備えたものである。The means for solving the problems according to claims 13 and 14 is:
As shown in FIG. 10, a temperature sensor 71, a capacity variable means 80 for varying the capacity of the condenser 21, and a capillary tube 23
Control means 81 for reducing the capacity of the condenser 21 when the temperature on the inlet side or the outlet side of the condenser 21 becomes equal to or lower than a predetermined temperature, and the capacity changing means 80 comprises an auxiliary condenser connected in series to the condenser 21. 82, a bypass passage 83 formed in parallel with the auxiliary condenser 82, and a switching valve 84a provided at a connection portion between the auxiliary condenser 82 and the bypass passage 83.
84b.

【００１７】請求項１５，１６による課題解決手段は、
図１１の如く、温度センサ７１と、凝縮器２１を冷却す
るための冷却用ファン８８と、キャピラリチューブ２３
の入口側あるいは出口側の温度が所定の温度以下になる
と冷却用ファン８８の回転数を下げるあるいは冷却用フ
ァン８８の駆動を停止する制御手段８９とが設けられた
ものである。The means for solving the problems according to claims 15 and 16 is:
As shown in FIG. 11, a temperature sensor 71, a cooling fan 88 for cooling the condenser 21, and a capillary tube 23
Control means 89 for reducing the rotation speed of the cooling fan 88 or stopping the driving of the cooling fan 88 when the temperature on the inlet side or the outlet side becomes lower than a predetermined temperature.

【００１８】請求項１７，１８による課題解決手段は、
図１２の如く、温度センサ７１と、冷却用ファン８８
と、冷却用ファン８８から凝縮器２１への通風量を調節
する通風量調節手段９０と、キャピラリチューブ２３の
入口側あるいは出口側の温度が所定の温度以下になると
冷却用ファン８８から凝縮器２１への通風量を小とする
制御手段９１とが設けられ、通風量調節手段９０は、冷
却用ファン８８と凝縮器２１との間に配された通風ダク
ト９２を開閉する通風調節ダンパ９３からなるものであ
る。The means for solving the problems according to claims 17 and 18 is:
As shown in FIG. 12, a temperature sensor 71 and a cooling fan 88 are provided.
Ventilation means 90 for adjusting the amount of air flowing from the cooling fan 88 to the condenser 21; and, when the temperature on the inlet side or the outlet side of the capillary tube 23 falls below a predetermined temperature, the cooling fan 88 Control means 91 for reducing the amount of air flow into the cooling fan 88. The air flow amount adjusting means 90 comprises a ventilation adjusting damper 93 which opens and closes a ventilation duct 92 arranged between the cooling fan 88 and the condenser 21. Things.

【００１９】請求項１９による課題解決手段は、図１３
の如く、温度センサ７１と、凝縮器２１を加熱する加熱
ヒータ９５と、キャピラリチューブ２３の入口側あるい
は出口側の温度が所定の温度以下になると加熱ヒータ９
５を作動する制御手段９６とが設けられたものである。The means for solving problems according to claim 19 is shown in FIG.
, A heater 95 for heating the condenser 21 and a heater 9 when the temperature on the inlet side or the outlet side of the capillary tube 23 becomes lower than a predetermined temperature.
5 is provided with control means 96 for operating the control unit 5.

【００２０】[0020]

【作用】上記課題解決手段において、配管２６やキャピ
ラリチューブ２３等のパイプ類の作成時に使用してパイ
プ類の内壁に付着したオイルがＨＦＣ１３４ａ用圧縮機
油や冷媒に溶け込み冷凍サイクルを循環するとき、請求
項１では、オイル溜め器２７内に導かれると、断面積の
急拡大で流速が急激に低下し、密度の大きい液状のオイ
ルが分離されてオイル溜め器２７内に溜まり、密度の小
さい冷媒はそのままキャピラリチューブ２３内に流入し
て冷凍サイクルを循環する。また、請求項２，３，４で
は、オイル溜め器３０を冷却あるいは断熱することによ
り、オイルが圧縮機油や冷媒に溶け込めなくなり、オイ
ル溜め器３０に溜まる。In the above-mentioned means for solving the above problems, when oil adhering to the inner wall of pipes used in the production of pipes such as the pipe 26 and the capillary tube 23 dissolves in the compressor oil or refrigerant for the HFC134a and circulates in the refrigeration cycle, In item 1, when the oil is guided into the oil sump 27, the flow velocity sharply decreases due to the rapid expansion of the cross-sectional area, the high-density liquid oil is separated and accumulated in the oil sump 27, and the low-density refrigerant is It flows directly into the capillary tube 23 and circulates through the refrigeration cycle. Further, in the second, third, and fourth aspects, the oil reservoir 30 is cooled or insulated, whereby the oil cannot be dissolved in the compressor oil or the refrigerant, and accumulates in the oil reservoir 30.

【００２１】請求項５ないし１１では、圧縮機２０の駆
動時間に応じて加熱ヒータ４０を作動、または冷媒をパ
イパス流路４６や副キャピラリチューブ５２に導いてキ
ャピラリチューブ２３の絞り度を減少させる、または冷
媒を逆循環させて圧縮機２０からの高温の冷媒をキャピ
ラリチューブ２３に流入することにより、キャピラリチ
ューブ２３の温度を上昇させる。すると、一時的に析出
したオイルが圧縮機油や冷媒に溶け込み、パイプ詰まり
等を防止できる。According to the fifth to eleventh aspects, the heater 40 is operated in accordance with the driving time of the compressor 20, or the refrigerant is guided to the bypass passage 46 or the sub-capillary tube 52 to reduce the degree of restriction of the capillary tube 23. Alternatively, the temperature of the capillary tube 23 is increased by flowing the high-temperature refrigerant from the compressor 20 into the capillary tube 23 by circulating the refrigerant in reverse. Then, the temporarily precipitated oil dissolves in the compressor oil or the refrigerant, and it is possible to prevent the pipe from being clogged.

【００２２】請求項１２では、温度センサ７１により検
知された温度が所定の温度以下になると冷却ファン７０
の風量を上げて蒸発器２４の熱交換を活発にすることに
より、キャピラリチューブ２３の温度を上昇させる。請
求項１３ないし１９では、温度センサ７１により検知さ
れた温度が所定の温度以下になると冷媒をパイパス流路
８３に導いて凝縮器全体の容量を小とする、または冷却
用ファン８８の回転数を下げるあるいは冷却用ファン８
８の駆動を停止する、または通風調節ダンパ９３を閉状
態とする、または加熱ヒータ９５を作動することによ
り、凝縮器２１の放熱量を減少させて、キャピラリチュ
ーブ２３の温度を上昇させる。すると、一時的に析出し
たオイルが圧縮機油や冷媒に溶け込み、パイプ詰まり等
を防止できる。In the twelfth aspect, when the temperature detected by the temperature sensor 71 falls below a predetermined temperature, the cooling fan 70
The heat exchange of the evaporator 24 is activated by increasing the air volume of the evaporator 24, thereby raising the temperature of the capillary tube 23. When the temperature detected by the temperature sensor 71 becomes equal to or lower than a predetermined temperature, the refrigerant is guided to the bypass passage 83 to reduce the capacity of the entire condenser or to reduce the rotation speed of the cooling fan 88. Lowering or cooling fan 8
By stopping the drive of 8, closing the ventilation adjusting damper 93, or operating the heater 95, the heat radiation amount of the condenser 21 is reduced, and the temperature of the capillary tube 23 is increased. Then, the temporarily precipitated oil dissolves in the compressor oil or the refrigerant, and it is possible to prevent the pipe from being clogged.

【００２３】[0023]

【Example】

（第一実施例）本発明の第一実施例の家庭用あるいは業
務用の冷凍装置は、図１の如く、ガス冷媒を圧縮する圧
縮機２０と、圧縮されたガス冷媒を液化させる凝縮器２
１と、液冷媒に含まれる水分等の不純物を除去するドラ
イヤ２２と、液冷媒を減圧するキャピラリチューブ２３
と、液冷媒を蒸発させる蒸発器２４と、吸入管２５とが
配管２６により接続されて冷凍サイクルが形成され、冷
媒としてＨＦＣ１３４ａが用いられている。そして、前
記キャピラリチューブ２３の入口側に、配管２６内に存
在するプレスオイルを冷媒から密度差を利用することに
より分離して溜めるオイル溜め器２７が設けられてい
る。(First Embodiment) As shown in FIG. 1, a home or business refrigeration system according to a first embodiment of the present invention comprises a compressor 20 for compressing a gas refrigerant and a condenser 2 for liquefying the compressed gas refrigerant.
1, a dryer 22 for removing impurities such as moisture contained in the liquid refrigerant, and a capillary tube 23 for decompressing the liquid refrigerant
The evaporator 24 for evaporating the liquid refrigerant and the suction pipe 25 are connected by a pipe 26 to form a refrigeration cycle, and the HFC 134a is used as a refrigerant. On the inlet side of the capillary tube 23, there is provided an oil reservoir 27 for retaining the press oil existing in the pipe 26 by separating the refrigerant from the refrigerant by utilizing the density difference.

【００２４】このオイル溜め器２７は、図２の如く、ド
ライヤ２２とキャピラリチューブ２３との間に介在され
た中空でマフラー状の拡管部とされている。そして、ド
ライヤ２２の出口側からの配管２６がオイル溜め器２７
の底面を貫通して内部に突出し、キャピラリチューブ２
３の入口側端部２３ａがオイル溜め器２７の上面を貫通
している。また、オイル溜め器２７の底面には、オイル
溜め器２７内に溜まったプレスオイルを蒸発器２４の入
口側に導く油戻り管２８が接続されている。なお、油戻
り管２８には、開閉弁２９が配されている。As shown in FIG. 2, the oil reservoir 27 is a hollow, muffler-like expanded portion interposed between the dryer 22 and the capillary tube 23. A pipe 26 from the outlet side of the dryer 22 is connected to an oil sump 27.
Protrudes inside through the bottom surface of the capillary tube 2
The third inlet-side end 23 a passes through the upper surface of the oil reservoir 27. Further, an oil return pipe 28 that guides the press oil accumulated in the oil reservoir 27 to the inlet side of the evaporator 24 is connected to a bottom surface of the oil reservoir 27. The oil return pipe 28 is provided with an on-off valve 29.

【００２５】上記構成において、配管２６やキャピラリ
チューブ２３等のパイプ類の作成時に使用してパイプ類
の内壁に付着したプレスオイルがＨＦＣ１３４ａ用圧縮
機油や冷媒に溶け込み冷凍サイクルを循環するとき、ド
ライヤ２３の出口側から配管２６によりオイル溜め器２
７内に導かれると、断面積の急拡大で流速が急激に低下
し、密度の大きい液状のプレスオイルおよびＨＦＣ１３
４ａ用圧縮機油が分離されて落下する。落下したプレス
オイルおよび圧縮機油はオイル溜め器２７内に溜まり、
密度の小さい冷媒はそのままキャピラリチューブ２３の
入口側端部２３ａからキャピラリチューブ２３内に流入
して冷凍サイクルを循環する。オイル溜め器２７内に溜
ったプレスオイルおよび圧縮機油は、開閉弁２９の開放
により油戻り管２８から再び冷媒サイクル内に戻され循
環する。これは、圧縮機油を圧縮機２０に戻して、圧縮
機２０の油不足を解消するためである。なお、冷凍サイ
クルにおける冷媒の循環は、従来と同様であるため省略
する。In the above construction, when press oil adhering to the inner walls of the pipes used in the production of pipes such as the pipe 26 and the capillary tube 23 dissolves in the compressor oil or refrigerant for the HFC 134a and circulates through the refrigeration cycle, Oil sump 2 by piping 26 from the outlet side of
7, the flow velocity sharply decreases due to the rapid expansion of the cross-sectional area, and the liquid press oil having a high density and the HFC 13
The 4a compressor oil is separated and falls. The press oil and compressor oil that have fallen accumulate in the oil sump 27,
The low-density refrigerant flows into the capillary tube 23 from the inlet end 23a of the capillary tube 23 as it is and circulates through the refrigeration cycle. The press oil and the compressor oil accumulated in the oil reservoir 27 are returned to the refrigerant cycle from the oil return pipe 28 by the opening of the on-off valve 29 and circulated. This is for returning the compressor oil to the compressor 20 to eliminate the oil shortage of the compressor 20. The circulation of the refrigerant in the refrigeration cycle is the same as in the conventional case, and a description thereof will be omitted.

【００２６】このように、プレスオイルが冷媒やＨＦＣ
１３４ａ用圧縮機油に溶け込み冷凍サイクルを循環する
とき、キャピラリチューブ２３の入口側に設けられたオ
イル溜め器２７により除去されるため、低温かつパイプ
内径の小さなキャピラリチューブ２３を通らない。した
がって、冷媒としてＨＦＣ１３４ａを使用してもオイル
の溜まりやすいキャピラリチューブ２３の出口側にプレ
スオイルが析出して固化することを防止できる。As described above, the press oil is used as a refrigerant or HFC.
When melted in the compressor oil for 134a and circulated through the refrigeration cycle, it is removed by the oil reservoir 27 provided on the inlet side of the capillary tube 23, and therefore does not pass through the capillary tube 23 having a low temperature and a small pipe inner diameter. Therefore, even if HFC134a is used as the refrigerant, it is possible to prevent the press oil from depositing and solidifying on the outlet side of the capillary tube 23 where oil easily accumulates.

【００２７】（第二実施例）第二実施例の冷凍装置は、
第一実施例のオイル溜め器２７の代わりに、図３の如
く、蒸発器２４の一部にオイル溜め器３０が設けられ、
該オイル溜め器３０を冷却する冷却装置３１が設けられ
ている。(Second Embodiment) The refrigeration apparatus of the second embodiment is
Instead of the oil sump 27 of the first embodiment, an oil sump 30 is provided in a part of the evaporator 24 as shown in FIG.
A cooling device 31 for cooling the oil reservoir 30 is provided.

【００２８】前記オイル溜め器３０は、蒸発器２４を構
成するパイプ中に介在された中空でマフラー状の拡管部
とされている。そして、上流側のパイプ端部２４ａがオ
イル溜め器３０の底面を貫通して内部に突出し、下流側
のパイプ端部２４ｂがオイル溜め器３０の上面を貫通し
ている。なお、オイル溜め器３０の容量は、冷凍サイク
ル内に混在するプレスオイルの容量よりも大とされてい
る。前記冷却装置３１としては、ビスマス（Ｂｉ）ある
いはテルル（Ｔｅ）からなる電子冷凍素子（ペルチェ素
子）が用いられ、オイル溜め器３０の壁面に装着されて
いる。なお、その他の構成は、第一実施例と同様であ
る。The oil reservoir 30 is a hollow, muffler-like expanded portion interposed in a pipe constituting the evaporator 24. The upstream pipe end 24a penetrates through the bottom surface of the oil reservoir 30 and projects inside, and the downstream pipe end 24b penetrates the upper surface of the oil reservoir 30. The capacity of the oil reservoir 30 is set to be larger than the capacity of the press oil mixed in the refrigeration cycle. As the cooling device 31, an electronic refrigerating device (Peltier device) made of bismuth (Bi) or tellurium (Te) is used, and is mounted on the wall surface of the oil reservoir 30. The other configuration is the same as that of the first embodiment.

【００２９】上記構成において、プレスオイルがＨＦＣ
１３４ａ用圧縮機油や冷媒に溶け込み冷凍サイクルを循
環するとき、キャピラリチューブ２３を通って蒸発器２
４内のオイル溜め器３０に導かれると、オイル溜め器３
０が冷却装置３１により極低温に電子冷却されているの
で、プレスオイルが圧縮機油や冷媒に溶け込めなくなり
オイル溜め器３０に溜まる。これは、プレスオイルと冷
媒（ＨＦＣ１３４ａ）およびＨＦＣ１３４ａ用圧縮機油
との低温時での相溶性が著しく悪いためである。そし
て、この作用を繰り返すことにより、冷凍サイクル内を
循環するプレスオイルが次々にオイル溜め器３０に蓄積
され、ひいては冷凍サイクル内を循環するプレスオイル
がなくなる。In the above structure, the press oil is HFC
When the refrigerant elutes with the compressor oil or refrigerant for 134a and circulates through the refrigeration cycle, the evaporator 2 passes through the capillary tube 23.
4 is led to the oil sump 30 in the oil sump 3
Since 0 is electronically cooled to an extremely low temperature by the cooling device 31, the press oil cannot be dissolved in the compressor oil or the refrigerant, and accumulates in the oil reservoir 30. This is because the compatibility of the press oil with the refrigerant (HFC134a) and the compressor oil for HFC134a at a low temperature is extremely poor. Then, by repeating this operation, the press oil circulating in the refrigeration cycle is accumulated in the oil reservoir 30 one after another, and the press oil circulating in the refrigeration cycle disappears.

【００３０】（第三実施例）第三実施例の冷凍装置は、
図４の如く、オイル溜め器３０の外周にオイル溜め器３
０を断熱する発泡スチロール等からなる断熱体３５が配
されている。このため、オイル溜め器３０においては、
外部との熱交換が減少して極低温となり、プレスオイル
がＨＦＣ１３４ａ用圧縮機油や冷媒に溶け込めなくなっ
てオイル溜め器３０に溜まる。なお、その他の構成およ
び動作は第二実施例と同様である。(Third Embodiment) The refrigerating apparatus of the third embodiment is
As shown in FIG. 4, the oil sump 3 is provided around the oil sump 30.
A heat insulator 35 made of Styrofoam or the like that insulates the thermal insulation 0 is provided. For this reason, in the oil sump 30,
The heat exchange with the outside decreases and the temperature becomes extremely low, so that the press oil cannot be dissolved in the compressor oil or the refrigerant for the HFC 134a and accumulates in the oil reservoir 30. Other configurations and operations are the same as those of the second embodiment.

【００３１】（第四実施例）第四実施例の冷凍装置は、
図５の如く、キャピラリチューブ２３の出口側を加熱す
る電気式の加熱ヒータ４０と、圧縮機２０の積算通電時
間に応じて加熱ヒータ４０の作動を制御するマイクロコ
ンピュータからなる制御手段４１とが設けられている。
この制御手段４１には、冷凍サイクル内を循環するプレ
スオイルの析出量が正常な冷媒循環を妨げる量となる時
間よりも短い基準となる時間Ｔが予め記憶されており、
冷却温度を一定とするために圧縮機２０の通電を制御す
る機能と、圧縮機２０の積算通電時間を計測するタイマ
ー機能と、計測された積算通電時間に基づいて基準とな
る時間Ｔが経過すると加熱ヒータ４０に所定時間通電す
る機能とを有している。なお、その他の構成は、オイル
溜め器２７の構造を除いた第一実施例と同様である。(Fourth Embodiment) A refrigeration apparatus according to a fourth embodiment comprises:
As shown in FIG. 5, an electric heater 40 for heating the outlet side of the capillary tube 23 and a control means 41 comprising a microcomputer for controlling the operation of the heater 40 in accordance with the cumulative energizing time of the compressor 20 are provided. Have been.
The control means 41 stores in advance a reference time T which is shorter than the time when the amount of press oil circulating in the refrigeration cycle is an amount that prevents normal refrigerant circulation,
A function of controlling the energization of the compressor 20 in order to keep the cooling temperature constant, a timer function of measuring the accumulated energization time of the compressor 20, and a time T that is a reference based on the measured accumulated energization time elapses A function of energizing the heater 40 for a predetermined time. The other configuration is the same as that of the first embodiment except for the structure of the oil reservoir 27.

【００３２】上記構成において、プレスオイルがＨＦＣ
１３４ａ用圧縮機油や冷媒に溶け込み冷凍サイクルを循
環するとき、時間がたつにつれて低温かつパイプ内径の
小さなキャピラリチューブ２３の出口側でプレスオイル
が溶け込めなくなり析出して固化し始める。ここで、圧
縮機２０の積算通電時間に基づいて基準となる時間Ｔが
経過する度に加熱ヒータ４０に所定時間通電される。す
ると、キャピラリチューブ２３の出口側の温度が上昇
し、一時的に析出したプレスオイルが溶融して、ＨＦＣ
１３４ａ用圧縮機油や冷媒に再び溶け込んで冷凍サイク
ルを循環する。In the above configuration, the press oil is HFC
When the refrigerant melts into the compressor oil or refrigerant for 134a and circulates through the refrigeration cycle, as time passes, the press oil at the outlet side of the capillary tube 23 having a low temperature and a small inside diameter of the pipe becomes insoluble and precipitates and starts to solidify. Here, each time a reference time T elapses based on the accumulated power-on time of the compressor 20, power is supplied to the heater 40 for a predetermined time. Then, the temperature on the outlet side of the capillary tube 23 rises, and the temporarily deposited press oil is melted, and HFC
The refrigerant is re-dissolved in the compressor oil or refrigerant for 134a and circulated through the refrigeration cycle.

【００３３】このように、一時的にプレスオイルがキャ
ピラリチューブ２３の出口側に析出しても、加熱ヒータ
４０に通電してキャピラリチューブ２３の出口側の温度
を上昇させることにより、プレスオイルをクリーニング
することができる。As described above, even if the press oil is temporarily deposited on the outlet side of the capillary tube 23, the press oil is cleaned by energizing the heater 40 and increasing the temperature on the outlet side of the capillary tube 23. can do.

【００３４】（第五実施例）第五実施例の冷凍装置は、
図６の如く、キャピラリチューブ２３の長さを可変する
長さ可変手段４３と、圧縮機２０の駆動時間に応じてキ
ャピラリチューブ２３の長さを制御する制御手段４４と
が設けられている。前記長さ可変手段４３は、キャピラ
リチューブ２３の上流側に直列に接続された補助キャピ
ラリチューブ４５と、該補助キャピラリチューブ４５に
並列に接続されたパイパス流路４６と、冷媒を補助キャ
ピラリチューブ４５あるいはパイパス流路４６に導く電
磁弁からなる切換弁４７とを備えている。なお、切換弁
４７に通電されていないときには、冷媒は補助キャピラ
リチューブ４５に導かれる。(Fifth Embodiment) A refrigerating apparatus according to a fifth embodiment comprises:
As shown in FIG. 6, a length varying means 43 for varying the length of the capillary tube 23 and a control means 44 for controlling the length of the capillary tube 23 according to the driving time of the compressor 20 are provided. The length changing means 43 includes an auxiliary capillary tube 45 connected in series upstream of the capillary tube 23, a bypass flow path 46 connected in parallel to the auxiliary capillary tube 45, and a refrigerant for the auxiliary capillary tube 45 or And a switching valve 47 formed of an electromagnetic valve for guiding to the bypass flow path 46. When the switching valve 47 is not energized, the refrigerant is guided to the auxiliary capillary tube 45.

【００３５】前記制御手段４４は、第四実施例の加熱ヒ
ータ４０に所定時間通電する機能の代わりに、計測され
た積算通電時間に基づいて基準となる時間Ｔが経過する
と切換弁４７に所定時間通電して冷媒をバイパス流路４
６に導く機能を有している。なお、その他の構成は、加
熱ヒータ４０の構造を除いた第四実施例と同様である。Instead of the function of energizing the heater 40 of the fourth embodiment for a predetermined period of time, the control means 44 applies a predetermined time to the switching valve 47 when a reference time T elapses based on the measured cumulative energization time. Energize and bypass refrigerant 4
6 is provided. The other configuration is the same as that of the fourth embodiment except for the structure of the heater 40.

【００３６】上記構成において、プレスオイルがＨＦＣ
１３４ａ用圧縮機油や冷媒に溶け込み直列に接続された
補助キャピラリチューブ４５およびキャピラリチューブ
２３を通過して蒸発器２４に導かれる冷凍サイクルを循
環する。しばらくすると、キャピラリチューブ２３の出
口側でプレスオイルが溶け込めなくなり固化して析出し
始める。ここで、圧縮機２０の積算通電時間に基づいて
基準Ｔが経過する度に切換弁４７に所定時間通電され
る。すると、ＨＦＣ１３４ａ用圧縮機油や冷媒に溶け込
んだプレスオイルは、補助キャピラリチューブ４５を回
避してパイパス流路４６およびキャピラリチューブ２３
を通過して蒸発器２４に導かれる冷凍サイクルを循環す
る。これにより、キャピラリチューブ全体の長さが小と
なって絞り度が減少し、キャピラリチューブ２３の出口
側および蒸発器２４の温度が上昇し、一時的に析出した
プレスオイルが溶融して、ＨＦＣ１３４ａ用圧縮機油や
冷媒に再び溶け込んで冷凍サイクルを循環する。In the above configuration, the press oil is HFC
The refrigerant flows into the evaporator 24 through the auxiliary capillary tube 45 and the capillary tube 23 which are dissolved in the compressor oil or refrigerant for 134a and connected in series. After a while, the press oil at the outlet side of the capillary tube 23 becomes insoluble and solidifies and starts to precipitate. Here, the switching valve 47 is energized for a predetermined time every time the reference T elapses based on the integrated energizing time of the compressor 20. Then, the press oil dissolved in the compressor oil for the HFC 134a and the refrigerant bypasses the auxiliary capillary tube 45 and bypasses the bypass passage 46 and the capillary tube 23.
And circulates through a refrigeration cycle guided to the evaporator 24. As a result, the entire length of the capillary tube becomes small and the degree of squeezing decreases, the temperature of the outlet side of the capillary tube 23 and the temperature of the evaporator 24 rise, and the temporarily deposited press oil is melted and used for HFC134a. It is re-dissolved in compressor oil and refrigerant and circulated through the refrigeration cycle.

【００３７】このように、キャピラリチューブ全体の長
さを小として絞り度を減少させて、キャピラリチューブ
２３の出口側の温度を上昇させることにより、一時的に
析出したプレスオイルをクリーニングすることができ
る。As described above, by temporarily reducing the press oil that has temporarily precipitated, the entire length of the capillary tube is reduced to reduce the degree of restriction and increase the temperature at the outlet side of the capillary tube 23. .

【００３８】（第六実施例）第六実施例の冷凍装置は、
図７の如く、キャピラリチューブ２３の内径を可変する
内径可変手段５０と、圧縮機２０の駆動時間に応じてキ
ャピラリチューブ２３の内径を制御する制御手段５１と
が設けられている。前記内径可変手段５０は、キャピラ
リチューブ２３に並列に接続されキャピラリチューブ２
３よりも内径が大である副キャピラリチューブ５２と、
冷媒をキャピラリチューブ２３あるいは副キャピラリチ
ューブ５２に導く切換弁５３とを備えている。なお、切
換弁５３に通電されていないときには、冷媒はキャピラ
リチューブ２３のみに導かれる。(Sixth Embodiment) A refrigeration apparatus according to a sixth embodiment comprises:
As shown in FIG. 7, an inner diameter varying means 50 for varying the inner diameter of the capillary tube 23 and a control means 51 for controlling the inner diameter of the capillary tube 23 according to the driving time of the compressor 20 are provided. The variable inner diameter means 50 is connected to the capillary tube 23 in parallel and connected to the capillary tube 2.
A sub-capillary tube 52 having an inner diameter larger than 3;
A switching valve 53 for guiding the refrigerant to the capillary tube 23 or the sub-capillary tube 52; When the switching valve 53 is not energized, the refrigerant is guided only to the capillary tube 23.

【００３９】前記制御手段５１は、第四実施例の加熱ヒ
ータ４０に所定時間通電する機能の代わりに、計測され
た積算通電時間に基づいて基準となる時間Ｔが経過する
と切換弁５３に所定時間通電して冷媒を副キャピラリチ
ューブ５２に導く機能を有している。なお、その他の構
成は、加熱ヒータ４０の構造を除いた第四実施例と同様
である。In place of the function of energizing the heater 40 of the fourth embodiment for a predetermined time, the control means 51 causes the switching valve 53 to operate for a predetermined time after a lapse of a reference time T based on the measured integrated energization time. It has a function of conducting electricity to guide the refrigerant to the sub-capillary tube 52. The other configuration is the same as that of the fourth embodiment except for the structure of the heater 40.

【００４０】上記構成において、プレスオイルがＨＦＣ
１３４ａ用圧縮機油や冷媒に溶け込み通常の冷凍サイク
ルを循環する。圧縮機２０の積算通電時間に基づいて基
準となる時間Ｔが経過する度に切換弁５３に所定時間通
電される。すると、ＨＦＣ１３４ａ用圧縮機油や冷媒に
溶け込んだプレスオイルは、キャピラリチューブ２３を
回避して内径が大である副キャピラリチューブ５２のみ
を通過して蒸発器２４に導かれる冷凍サイクルを循環す
る。これにより、キャピラリチューブの内径が大となっ
て絞り度が減少し、キャピラリチューブ２３の出口側お
よび蒸発器２４の温度が上昇し、一時的に析出したプレ
スオイルが溶融して、ＨＦＣ１３４ａ用圧縮機油や冷媒
に再び溶け込んで冷凍サイクルを循環する。In the above structure, the press oil is HFC
It dissolves in the compressor oil and refrigerant for 134a and circulates through a normal refrigeration cycle. The switching valve 53 is energized for a predetermined time every time the reference time T elapses based on the integrated energizing time of the compressor 20. Then, the press oil dissolved in the compressor oil for the HFC 134a and the refrigerant passes through only the sub-capillary tube 52 having a large inner diameter, bypassing the capillary tube 23, and circulates in the refrigeration cycle guided to the evaporator 24. As a result, the inner diameter of the capillary tube becomes large and the degree of squeezing decreases, the temperature of the outlet side of the capillary tube 23 and the temperature of the evaporator 24 rise, and the temporarily deposited press oil is melted, and the compressor oil for HFC134a is melted. Or re-dissolves in the refrigerant and circulates through the refrigeration cycle.

【００４１】このように、キャピラリチューブの内径を
大として絞り度を減少させて、キャピラリチューブ２３
の出口側の温度を上昇させることにより、一時的に析出
したプレスオイルをクリーニングすることができる。As described above, the diameter of the capillary tube is reduced by increasing the inner diameter of the capillary tube.
By raising the temperature on the outlet side of the above, the press oil temporarily precipitated can be cleaned.

【００４２】（第七実施例）第七実施例の冷凍装置は、
図８の如く、圧縮機２０で圧縮されたガス冷媒を蒸発器
２４からキャピラリチューブ２３を経てドライヤ２２か
ら凝縮器２１に逆循環させる冷媒逆循環手段６０と、圧
縮機２０の駆動時間に応じて冷媒の循環方向を制御する
制御手段６１とが設けられている。前記冷媒逆循環手段
６０は、圧縮機２０の出口側から蒸発器２４の出口側に
接続された第一バイパス６２と、凝縮器２１の入口側か
ら圧縮機２０の入口側に接続された第二バイパス６３
と、前記第一および第二バイパス６２，６３の接続部分
に設けられた４個の切換弁６４ａ，６４ｂ，６４ｃ，６
４ｄとを備えている。なお、切換弁６４ａ，６４ｂ，６
４ｃ，６４ｄに通電されていないときには、冷媒は通常
の冷凍サイクルＡを循環する。(Seventh Embodiment) The refrigerating apparatus of the seventh embodiment is
As shown in FIG. 8, according to the driving time of the compressor 20, the refrigerant reverse circulation means 60 reversely circulates the gas refrigerant compressed by the compressor 20 from the evaporator 24 via the capillary tube 23 to the condenser 22. And control means 61 for controlling the direction of circulation of the refrigerant. The refrigerant reverse circulation means 60 includes a first bypass 62 connected from an outlet side of the compressor 20 to an outlet side of the evaporator 24, and a second bypass 62 connected from an inlet side of the condenser 21 to an inlet side of the compressor 20. Bypass 63
And four switching valves 64 a, 64 b, 64 c, 6 provided at a connection portion of the first and second bypasses 62, 63.
4d. The switching valves 64a, 64b, 6
When power is not supplied to 4c and 64d, the refrigerant circulates through the normal refrigeration cycle A.

【００４３】前記制御手段６１は、第四実施例の加熱ヒ
ータ４０に所定時間通電する機能の代わりに、計測され
た積算通電時間に基づいて基準となる時間Ｔが経過する
と切換弁６４ａ，６４ｂ，６４ｃ，６４ｄに所定時間通
電して冷媒を第一バイパス６２から逆循環して第二バイ
パス６３に導く機能を有している。なお、その他の構成
は、加熱ヒータ４０の構造を除いた第四実施例と同様で
ある。The control means 61 replaces the function of energizing the heater 40 of the fourth embodiment for a predetermined time, and switches the switching valves 64a, 64b, 64b when a reference time T elapses based on the measured integrated energizing time. A function is provided in which the refrigerant is reversely circulated from the first bypass 62 by conducting electricity to the 64c and 64d for a predetermined time and guided to the second bypass 63. The other configuration is the same as that of the fourth embodiment except for the structure of the heater 40.

【００４４】上記構成において、プレスオイルがＨＦＣ
１３４ａ用圧縮機油や冷媒に溶け込み通常の冷凍サイク
ルＡを循環する。圧縮機２０の積算通電時間に基づいて
基準となる時間Ｔが経過する度に各切換弁６４ａ，６４
ｂ，６４ｃ，６４ｄに所定時間通電される。すると、Ｈ
ＦＣ１３４ａ用圧縮機油や冷媒に溶け込んだプレスオイ
ルは、圧縮機２０から蒸発器２４、キャピラリチューブ
２３、ドライヤ２２、凝縮器２１の順に逆循環サイクル
Ｂを循環する。これにより、圧縮機２０で圧縮された高
温のガス冷媒がキャピラリチューブ２３の出口側に導か
れてこの出口側の温度が上昇し、一時的に析出したプレ
スオイルが溶融して、ＨＦＣ１３４ａ用圧縮機油や冷媒
に再び溶け込んで冷凍サイクルを循環する。In the above structure, the press oil is HFC
It dissolves in the compressor oil and refrigerant for 134a and circulates through the normal refrigeration cycle A. Each time a reference time T elapses based on the cumulative energizing time of the compressor 20, each of the switching valves 64a, 64
B, 64c and 64d are energized for a predetermined time. Then H
The press oil dissolved in the compressor oil for the FC 134a and the refrigerant circulates through the reverse circulation cycle B from the compressor 20 to the evaporator 24, the capillary tube 23, the dryer 22, and the condenser 21 in this order. As a result, the high-temperature gas refrigerant compressed by the compressor 20 is guided to the outlet side of the capillary tube 23, the temperature at the outlet side rises, and the press oil temporarily precipitated is melted, and the compressor oil for the HFC 134a is compressed. Or re-dissolves in the refrigerant and circulates through the refrigeration cycle.

【００４５】このように、冷媒を逆循環させてキャピラ
リチューブ２３の出口側の温度を上昇させることによ
り、一時的に析出したプレスオイルをクリーニングする
ことができる。As described above, by temporarily circulating the refrigerant to increase the temperature at the outlet side of the capillary tube 23, the temporarily deposited press oil can be cleaned.

【００４６】（第八実施例）第八実施例の冷凍装置は、
図９の如く、蒸発器２４で熱交換された冷気を冷凍室等
に送り出す冷却ファン７０が設けられ、キャピラリチュ
ーブ２３の出口側の温度を検知する温度センサ７１と、
該温度センサ７１からの出力信号により冷却ファン７０
の回転数を制御する制御手段７２とが設けられている。
前記温度センサ７１はサーミスタからなり、キャピラリ
チューブ２３の出口側外面に装着されている。(Eighth Embodiment) The refrigeration apparatus of the eighth embodiment is
As shown in FIG. 9, a cooling fan 70 that sends cold air heat exchanged by the evaporator 24 to a freezing room or the like is provided, and a temperature sensor 71 that detects a temperature at an outlet side of the capillary tube 23;
The output signal from the temperature sensor 71 allows the cooling fan 70
And control means 72 for controlling the number of rotations.
The temperature sensor 71 is composed of a thermistor, and is mounted on the outer surface of the capillary tube 23 on the outlet side.

【００４７】前記制御手段７２は、温度センサ７１の検
知温度が設定温度以上のとき冷却ファン７０を間引き運
転させる機能と、温度センサ７１の検知温度が設定温度
以下のとき冷却ファン７０を連続運転して風量を上げる
機能とを有している。このときの設定温度は、プレスオ
イルがＨＦＣ１３４ａ用圧縮機油や冷媒に溶け込むこと
が困難となる温度に対応した温度である。なお、その他
の構成は、オイル溜め器２７の構造を除いた第一実施例
と同様である。The control means 72 has a function of thinning out the cooling fan 70 when the temperature detected by the temperature sensor 71 is equal to or higher than the set temperature, and continuously operates the cooling fan 70 when the temperature detected by the temperature sensor 71 is equal to or lower than the set temperature. And a function to increase the air volume. The set temperature at this time is a temperature corresponding to a temperature at which it becomes difficult for the press oil to dissolve into the compressor oil for HFC134a or the refrigerant. The other configuration is the same as that of the first embodiment except for the structure of the oil reservoir 27.

【００４８】上記構成において、プレスオイルがＨＦＣ
１３４ａ用圧縮機油や冷媒に溶け込み冷凍サイクルを循
環するとき、温度センサ７１により検知された温度が設
定温度以上であれば冷却ファン７０を間引き運転させて
蒸発器２４からの冷気を冷凍室等に送り出す。一方、温
度センサ７１により検知された温度が設定温度以下とな
ると、冷却ファン７０を連続運転させて風量を上げる。
すると、蒸発器２４において熱交換が活発に行われてキ
ャピラリチューブ２３の出口側の温度が上昇する。これ
により、キャピラリチューブ２３の出口側で一時的に析
出したプレスオイルが溶融して、ＨＦＣ１３４ａ用圧縮
機油や冷媒に再び溶け込んで冷凍サイクルを循環する。
そして、キャピラリチューブ２３の出口側の温度が設定
温度以上になると、再び冷却ファン７０を間引き運転さ
せる。In the above configuration, the press oil is HFC
When the refrigerant melts in the compressor oil or refrigerant for 134a and circulates through the refrigeration cycle, if the temperature detected by the temperature sensor 71 is equal to or higher than the set temperature, the cooling fan 70 is thinned out to send cool air from the evaporator 24 to a freezing room or the like. . On the other hand, when the temperature detected by the temperature sensor 71 becomes equal to or lower than the set temperature, the cooling fan 70 is continuously operated to increase the air volume.
Then, heat exchange is actively performed in the evaporator 24, and the temperature on the outlet side of the capillary tube 23 rises. As a result, the press oil temporarily precipitated on the outlet side of the capillary tube 23 is melted, re-dissolved in the compressor oil for the HFC 134a and the refrigerant, and circulated through the refrigeration cycle.
Then, when the temperature on the outlet side of the capillary tube 23 becomes equal to or higher than the set temperature, the cooling fan 70 is again operated to thin out.

【００４９】このように、冷却ファン７０の風量を上げ
て蒸発器２４における熱交換を活発に行わせて、キャピ
ラリチューブ２３の出口側の温度を上昇させることによ
り、一時的に析出したプレスオイルをクリーニングする
ことができる。As described above, by increasing the air volume of the cooling fan 70 to activate the heat exchange in the evaporator 24 and raise the temperature at the outlet side of the capillary tube 23, the press oil temporarily precipitated can be removed. Can be cleaned.

【００５０】（第九実施例）第九実施例の冷凍装置は、
図１０の如く、第八実施例と同様の温度センサ７１と、
凝縮器２１の容量を可変する容量可変手段８０と、温度
センサ７１からの出力信号により凝縮器２１の容量を制
御する制御手段８１とが設けられている。前記容量可変
手段８０は、凝縮器２１の上流側に直列に接続された補
助凝縮器８２と、該補助凝縮器８２に並列に形成された
パイパス流路８３と、冷媒を補助凝縮器８２とパイパス
流路８３との接続部分に設けられた２個の切換弁８４
ａ，８４ｂとを備えている。なお、切換弁８４ａ，８４
ｂに通電されていないときには、冷媒は補助凝縮器８２
に導かれる。(Ninth Embodiment) The refrigeration apparatus of the ninth embodiment is
As shown in FIG. 10, a temperature sensor 71 similar to that of the eighth embodiment,
A capacity changing means 80 for changing the capacity of the condenser 21 and a control means 81 for controlling the capacity of the condenser 21 based on an output signal from the temperature sensor 71 are provided. The capacity changing means 80 includes an auxiliary condenser 82 connected in series upstream of the condenser 21, a bypass flow path 83 formed in parallel with the auxiliary condenser 82, and a refrigerant passing between the auxiliary condenser 82 and the bypass condenser 82. Two switching valves 84 provided at a connection portion with the flow path 83
a, 84b. The switching valves 84a, 84
b is not energized, the refrigerant is supplied to the auxiliary condenser 82
It is led to.

【００５１】前記制御手段８１は、温度センサ７１の検
知温度が設定温度以上になると切換弁８４に通電せずに
冷媒を補助凝縮器８２に導く機能と、温度センサ７１の
検知温度が設定温度以下になってから一定時間経過する
と切換弁８４ａ，８４ｂに通電して冷媒をパイパス流路
８３に導く機能を有している。その他の構成は、オイル
溜め器２７の構造を除いた第一実施例と同様である。The control means 81 has a function of guiding the refrigerant to the auxiliary condenser 82 without energizing the switching valve 84 when the temperature detected by the temperature sensor 71 exceeds the set temperature, and a function of detecting the temperature of the temperature sensor 71 below the set temperature. After a certain time has passed since the start of the operation, the switching valves 84a and 84b are energized to guide the refrigerant to the bypass passage 83. Other configurations are the same as those of the first embodiment except for the structure of the oil reservoir 27.

【００５２】上記構成において、プレスオイルがＨＦＣ
１３４ａ用圧縮機油や冷媒に溶け込み冷凍サイクルを循
環するとき、温度センサ７１により検知された温度が設
定温度以上であれば切換弁８４ａ，８４ｂに通電せずに
補助凝縮器８２に導く。一方、温度センサ７１により検
知された温度が設定温度以下となって一定時間経過する
と、切換弁８４ａ，８４ｂに通電してＨＦＣ１３４ａ用
圧縮機油や冷媒に溶け込んだプレスオイルをパイパス流
路８３から凝縮器２１に導く。すると、凝縮器全体の容
量が小となって放熱量が減少するため、蒸発器２４およ
びキャピラリチューブ２３の出口側の温度が上昇する。
これにより、キャピラリチューブ２３の出口側で一時的
に析出したプレスオイルが溶融して、ＨＦＣ１３４ａ用
圧縮機油や冷媒に再び溶け込んで冷凍サイクルを循環す
る。そして、キャピラリチューブ２３の出口側の温度が
設定温度以上になると、切換弁８４ａ，８４ｂへの通電
を停止してＨＦＣ１３４ａ用圧縮機油や冷媒に溶け込ん
だプレスオイルを補助凝縮器８２に導く。In the above structure, the press oil is HFC
When the refrigerant melts into the compressor oil or refrigerant for 134a and circulates through the refrigeration cycle, if the temperature detected by the temperature sensor 71 is equal to or higher than the set temperature, the temperature is guided to the auxiliary condenser 82 without energizing the switching valves 84a and 84b. On the other hand, when the temperature detected by the temperature sensor 71 becomes equal to or lower than the set temperature and a predetermined time elapses, the switching valves 84a and 84b are energized so that the compressor oil for the HFC 134a or the press oil dissolved in the refrigerant flows from the bypass passage 83 through the condenser 83. Lead to 21. Then, since the capacity of the entire condenser is reduced and the amount of heat radiation is reduced, the temperature at the outlet side of the evaporator 24 and the capillary tube 23 is increased.
As a result, the press oil temporarily precipitated on the outlet side of the capillary tube 23 is melted, re-dissolved in the compressor oil for the HFC 134a and the refrigerant, and circulated through the refrigeration cycle. When the temperature at the outlet side of the capillary tube 23 becomes equal to or higher than the set temperature, the power supply to the switching valves 84a and 84b is stopped, and the compressor oil for the HFC 134a and the press oil dissolved in the refrigerant are guided to the auxiliary condenser 82.

【００５３】このように、凝縮器全体の容量を小として
放熱量を減少させて、キャピラリチューブ２３の出口側
の温度を上昇させることにより、一時的に析出したプレ
スオイルをクリーニングすることができる。As described above, the press oil temporarily deposited can be cleaned by reducing the heat radiation amount by reducing the capacity of the entire condenser and increasing the temperature at the outlet side of the capillary tube 23.

【００５４】（第十実施例）第十実施例の冷凍装置は、
図１１の如く、第八実施例と同様の温度センサ７１と、
凝縮器２１の放熱を促進して冷却するための冷却用ファ
ン８８と、温度センサ７１からの出力信号により冷却フ
ァン８８の回転数を制御する制御手段８９とが設けられ
ている。(Tenth Embodiment) The refrigerating apparatus of the tenth embodiment is
As shown in FIG. 11, a temperature sensor 71 similar to that of the eighth embodiment,
A cooling fan 88 for promoting heat radiation of the condenser 21 for cooling and a control means 89 for controlling the rotation speed of the cooling fan 88 based on an output signal from the temperature sensor 71 are provided.

【００５５】前記制御手段８９は、温度センサ７１の検
知温度が設定温度以上のとき冷却用ファン８８を通常運
転させる機能と、温度センサ７１の検知温度が設定温度
以下になってから一定時間経過すると冷却用ファン８８
の回転数を下げる機能とを有している。また、制御手段
８９においては、冷却用ファン８８の回転数を下げる機
能の代わりに、冷却用ファン８８への通電を停止する機
能を有してもよい。なお、その他の構成は、オイル溜め
器２７の構造を除いた第一実施例と同様である。The control means 89 has a function of normally operating the cooling fan 88 when the temperature detected by the temperature sensor 71 is equal to or higher than the set temperature. Cooling fan 88
And a function of lowering the number of rotations. Further, the control means 89 may have a function of stopping the power supply to the cooling fan 88 instead of the function of reducing the rotation speed of the cooling fan 88. The other configuration is the same as that of the first embodiment except for the structure of the oil reservoir 27.

【００５６】上記構成において、プレスオイルがＨＦＣ
１３４ａ用圧縮機油や冷媒に溶け込み冷凍サイクルを循
環するとき、温度センサ７１により検知された温度が設
定温度以上であれば、冷却用ファン８８を通常運転させ
て凝縮器２１の放熱を促進させることにより、蒸発器２
４を低温にして冷却効率を上げる。一方、温度センサ７
１により検知された温度が設定温度以下となってから一
定時間経過すると、冷却用ファン８８の回転数を下げる
か冷却用ファン８８への通電を停止する。すると、凝縮
器２１において放熱量が減少し、キャピラリチューブ２
３の出口側の温度が上昇する。これにより、キャピラリ
チューブ２３の出口側で一時的に析出したプレスオイル
が溶融して、ＨＦＣ１３４ａ用圧縮機油や冷媒に再び溶
け込んで冷凍サイクルを循環する。そして、キャピラリ
チューブ２３の出口側の温度が設定温度以上になると、
再び冷却用ファン８８を通常運転させる。In the above configuration, the press oil is HFC
If the temperature detected by the temperature sensor 71 is equal to or higher than the set temperature when the refrigerant is melted in the compressor oil or refrigerant for 134a and circulates through the refrigeration cycle, the cooling fan 88 is normally operated to promote the heat radiation of the condenser 21. , Evaporator 2
4 is set to a low temperature to increase the cooling efficiency. On the other hand, the temperature sensor 7
When a certain period of time elapses after the temperature detected in step 1 becomes equal to or lower than the set temperature, the rotation speed of the cooling fan 88 is reduced or the power supply to the cooling fan 88 is stopped. Then, the heat radiation amount in the condenser 21 decreases, and the capillary tube 2
The temperature at the outlet side of 3 rises. As a result, the press oil temporarily precipitated on the outlet side of the capillary tube 23 is melted, re-dissolved in the compressor oil for the HFC 134a and the refrigerant, and circulated through the refrigeration cycle. When the temperature on the outlet side of the capillary tube 23 becomes equal to or higher than the set temperature,
The cooling fan 88 is again operated normally.

【００５７】このように、冷却用ファン８８の回転数を
下げるか冷却用ファン８８への通電を停止して凝縮器２
１における放熱量を減少させて、キャピラリチューブ２
３の出口側の温度を上昇させることにより、一時的に析
出したプレスオイルをクリーニングすることができる。As described above, the rotation speed of the cooling fan 88 is reduced or the power supply to the cooling fan 88 is stopped, and the condenser 2
1 to reduce the amount of heat radiation
By raising the temperature of the outlet side of No. 3, the temporarily deposited press oil can be cleaned.

【００５８】（第十一実施例）第十一実施例の冷凍装置
は、図１２の如く、冷却用ファン８８から凝縮器２１へ
の通風量を調節する通風量調節手段９０と、温度センサ
７１からの出力信号により通風量を制御する制御手段９
１とが設けられている。前記通風量調節手段９０は、冷
却用ファン８８と凝縮器２１との間に配された通風ダク
ト９２を開閉する通風調節ダンパ９３からなる。(Eleventh Embodiment) As shown in FIG. 12, the refrigerating apparatus of the eleventh embodiment has a ventilation amount adjusting means 90 for adjusting the ventilation amount from the cooling fan 88 to the condenser 21, and a temperature sensor 71. Control means 9 for controlling the amount of ventilation by an output signal from
1 is provided. The ventilation amount adjusting means 90 includes a ventilation adjusting damper 93 that opens and closes a ventilation duct 92 disposed between the cooling fan 88 and the condenser 21.

【００５９】前記制御手段９１は、温度センサ７１の検
知温度が設定温度以上のとき通風調節ダンパ９３を開状
態として通風量を大とする機能と、温度センサ７１の検
知温度が設定温度以下になってから一定時間経過すると
通風調節ダンパ９３を閉状態として通風量を小とする機
能とを有している。なお、その他の構成は、制御手段８
９を除いた第十実施例と同様である。The control means 91 has a function of opening the ventilation adjusting damper 93 when the temperature detected by the temperature sensor 71 is higher than the set temperature to increase the amount of air flow, and a function of detecting the temperature of the temperature sensor 71 below the set temperature. After a lapse of a certain period of time from the start, the ventilation adjusting damper 93 is closed to reduce the ventilation volume. Note that the other configuration is similar to the control unit 8
This is the same as the tenth embodiment except for No. 9.

【００６０】上記構成において、プレスオイルがＨＦＣ
１３４ａ用圧縮機油や冷媒に溶け込み冷凍サイクルを循
環するとき、温度センサ７１により検知された温度が設
定温度以上であれば、通風調節ダンパ９３を開状態とし
て冷却用ファン８８からの通風量を大とし、凝縮器２１
の放熱を促進させることにより、蒸発器２４を低温にし
て冷却効率を上げる。一方、温度センサ７１により検知
された温度が設定温度以下となってから一定時間経過す
ると、通風調節ダンパ９３を閉状態として冷却用ファン
８８からの通風量を小とする。すると、凝縮器２１にお
いて放熱量が減少し、キャピラリチューブ２３の出口側
の温度が上昇する。これにより、キャピラリチューブ２
３の出口側で一時的に析出したプレスオイルが溶融し
て、ＨＦＣ１３４ａ用圧縮機油や冷媒に再び溶け込んで
冷凍サイクルを循環する。そして、キャピラリチューブ
２３の出口側の温度が設定温度以上になると、再び通風
調節ダンパ９３を開状態とする。In the above configuration, the press oil is HFC
If the temperature detected by the temperature sensor 71 is equal to or higher than the set temperature when the refrigerant is dissolved in the compressor oil or refrigerant for 134a and circulates through the refrigeration cycle, the ventilation adjustment damper 93 is opened to increase the amount of ventilation from the cooling fan 88. , Condenser 21
The cooling efficiency is increased by lowering the temperature of the evaporator 24 by promoting the heat radiation of the evaporator. On the other hand, when a certain period of time has elapsed after the temperature detected by the temperature sensor 71 has become equal to or lower than the set temperature, the ventilation adjusting damper 93 is closed to reduce the amount of ventilation from the cooling fan 88. Then, the amount of heat radiation in the condenser 21 decreases, and the temperature on the outlet side of the capillary tube 23 increases. Thereby, the capillary tube 2
The press oil temporarily precipitated at the outlet side of No. 3 is melted, re-dissolved in the compressor oil for the HFC 134a and the refrigerant, and circulates in the refrigeration cycle. Then, when the temperature on the outlet side of the capillary tube 23 becomes equal to or higher than the set temperature, the ventilation adjusting damper 93 is opened again.

【００６１】このように、通風調節ダンパ９３を閉状態
として冷却用ファン８８からの通風量を小とし、キャピ
ラリチューブ２３の出口側の温度を上昇させることによ
り、一時的に析出したプレスオイルをクリーニングする
ことができる。As described above, by closing the ventilation adjusting damper 93 to reduce the amount of ventilation from the cooling fan 88 and raising the temperature at the outlet side of the capillary tube 23, the temporarily deposited press oil is cleaned. can do.

【００６２】（第十二実施例）第十二実施例の冷凍装置
は、図１３の如く、第八実施例と同様の温度センサ７１
と、凝縮器２１を加熱する加熱ヒータ９５と、温度セン
サ７１からの出力信号により電気式の加熱ヒータ９５の
作動を制御する制御手段９６とが設けられている。(Twelfth Embodiment) A refrigeration apparatus of a twelfth embodiment has a temperature sensor 71 similar to that of the eighth embodiment as shown in FIG.
And a heater 95 for heating the condenser 21, and control means 96 for controlling the operation of the electric heater 95 based on an output signal from the temperature sensor 71.

【００６３】この制御手段９６は、温度センサ７１の検
知温度が設定温度以上のとき加熱ヒータ９５への通電を
停止する機能と、温度センサ７１の検知温度が設定温度
以下になってから一定時間経過すると加熱ヒータ９５に
通電して凝縮器２１の周辺を加熱する機能とを有してい
る。なお、その他の構成は、オイル溜め器２７の構造を
除いた第一実施例と同様である。The control means 96 has a function of stopping power supply to the heater 95 when the temperature detected by the temperature sensor 71 is equal to or higher than the set temperature, and a function that a predetermined time has elapsed since the temperature detected by the temperature sensor 71 became equal to or lower than the set temperature. Then, it has a function of energizing the heater 95 to heat the periphery of the condenser 21. The other configuration is the same as that of the first embodiment except for the structure of the oil reservoir 27.

【００６４】上記構成において、プレスオイルがＨＦＣ
１３４ａ用圧縮機油や冷媒に溶け込み冷凍サイクルを循
環するとき、温度センサ７１により検知された温度が設
定温度以上であれば、加熱ヒータ９５に通電しない。一
方、温度センサ７１により検知された温度が設定温度以
下となってから一定時間経過すると、加熱ヒータ９５に
通電する。すると、凝縮器２１の周辺の温度が上昇して
凝縮器２１において放熱量が減少し、キャピラリチュー
ブ２３の出口側の温度が上昇する。これにより、キャピ
ラリチューブ２３の出口側で一時的に析出したプレスオ
イルが溶融して、ＨＦＣ１３４ａ用圧縮機油や冷媒に再
び溶け込んで冷凍サイクルを循環する。そして、キャピ
ラリチューブ２３の出口側の温度が設定温度以上になる
と、加熱ヒータ９５への通電を停止する。In the above configuration, the press oil is HFC
When the refrigerant melts into the compressor oil or refrigerant for 134a and circulates through the refrigeration cycle, if the temperature detected by the temperature sensor 71 is equal to or higher than the set temperature, the heater 95 is not energized. On the other hand, when a certain period of time has elapsed after the temperature detected by the temperature sensor 71 has become equal to or lower than the set temperature, the heater 95 is energized. Then, the temperature around the condenser 21 increases, the amount of heat radiation in the condenser 21 decreases, and the temperature on the outlet side of the capillary tube 23 increases. As a result, the press oil temporarily precipitated on the outlet side of the capillary tube 23 is melted, re-dissolved in the compressor oil for the HFC 134a and the refrigerant, and circulated through the refrigeration cycle. When the temperature on the outlet side of the capillary tube 23 becomes equal to or higher than the set temperature, the power supply to the heater 95 is stopped.

【００６５】このように、加熱ヒータ９５に通電して凝
縮器２１の放熱量を減少させ、キャピラリチューブ２３
の出口側の温度を上昇させることにより、一時的に析出
したプレスオイルをクリーニングすることができる。As described above, the heater 95 is energized to reduce the amount of heat radiated from the condenser 21, and the capillary tube 23
By raising the temperature on the outlet side of the above, the press oil temporarily precipitated can be cleaned.

【００６６】なお、本発明は、上記実施例に限定される
ものではなく、本発明の範囲内で上記実施例に多くの修
正および変更を加え得ることは勿論である。例えば、第
一ないし第十二実施例の冷凍装置は、冷蔵庫以外のエア
コン等のものであってもよい。また、第一実施例におけ
るオイル溜め器２７に接続された油戻り管２８を廃止し
て、ＨＦＣ１３４ａ用圧縮機油を定期的に補給すること
により冷凍サイクル内のプレスオイルをなくすようにし
てもよい。Note that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention. For example, the refrigerating apparatuses of the first to twelfth embodiments may be air conditioners other than refrigerators. Further, the oil return pipe 28 connected to the oil sump 27 in the first embodiment may be eliminated, and the press oil in the refrigeration cycle may be eliminated by periodically replenishing the compressor oil for the HFC 134a.

【００６７】第五実施例の長さ可変手段として、長さの
異なる複数のキャピラリチューブを並列に接続して、各
キャピラリチューブへの冷媒の流れを切り換える切換弁
を設けてもよい。第八実施例における冷却ファン７０の
風量を上げる手段として、冷却ファン７０の回転数を上
げるようにしてもよい。第八ないし第十二実施例におけ
る温度センサ７１をキャピラリチューブ２３の入口側の
温度を検知するように配してもよい。さらに、第九実施
例の容量可変手段として、容量の異なる凝縮器を並列に
接続して、どちらか一方の凝縮器に冷媒が導かれるよう
に切換弁を設けてもよい。As the length varying means of the fifth embodiment, a switching valve for switching the flow of the refrigerant to each capillary tube by connecting a plurality of capillary tubes having different lengths in parallel may be provided. As means for increasing the air volume of the cooling fan 70 in the eighth embodiment, the rotation speed of the cooling fan 70 may be increased. The temperature sensor 71 in the eighth to twelfth embodiments may be arranged to detect the temperature on the inlet side of the capillary tube 23. Further, as the capacity variable means of the ninth embodiment, condensers having different capacities may be connected in parallel, and a switching valve may be provided so that the refrigerant is guided to one of the condensers.

【００６８】[0068]

【発明の効果】以上の説明から明らかな通り、本発明に
よると、冷媒サイクル内にオイル溜め器を配したり、キ
ャピラリチューブの出口側の温度を上昇させることによ
り、冷媒としてハイドロフルオロカーボン１３４ａを使
用しても、冷媒等に対して低温で相溶性のよくないオイ
ルがパイプ径の小さなキャピラリチューブの出口側等に
析出することがない。したがって、パイプ類の作成時に
完全な除去が困難な配管内のオイルによる配管詰まりを
防止でき、冷媒循環を長期的に維持でき、冷却不良をな
くして信頼性を高めた冷凍装置を提供できる。As apparent from the above description, according to the present invention, the hydrofluorocarbon 134a is used as a refrigerant by disposing an oil reservoir in the refrigerant cycle or increasing the temperature at the outlet side of the capillary tube. Even if the oil has low compatibility with the refrigerant or the like at low temperature, it does not precipitate at the outlet side of the capillary tube having a small pipe diameter. Therefore, it is possible to provide a refrigeration apparatus that can prevent pipe clogging due to oil in the pipe, which is difficult to completely remove at the time of making pipes, can maintain refrigerant circulation for a long period of time, eliminates cooling defects, and increases reliability.

[Brief description of the drawings]

【図１】本発明の第一実施例の冷凍サイクル図FIG. 1 is a refrigeration cycle diagram of a first embodiment of the present invention.

【図２】同じくオイル溜め器の詳細図FIG. 2 is a detailed view of the same oil reservoir.

【図３】第二実施例の冷凍サイクルの蒸発器周りの詳細
図FIG. 3 is a detailed view around the evaporator of the refrigeration cycle of the second embodiment.

【図４】第三実施例の冷凍サイクルの要部構成図FIG. 4 is a configuration diagram of a main part of a refrigeration cycle of a third embodiment.

【図５】第四実施例の冷凍サイクル図FIG. 5 is a refrigeration cycle diagram of a fourth embodiment.

【図６】第五実施例の冷凍サイクル図FIG. 6 is a refrigeration cycle diagram of a fifth embodiment.

【図７】第六実施例の冷凍サイクル図FIG. 7 is a refrigeration cycle diagram of a sixth embodiment.

【図８】第七実施例の冷凍サイクル図FIG. 8 is a refrigeration cycle diagram of a seventh embodiment.

【図９】第八実施例の冷凍サイクルの蒸発器周りの詳細
図FIG. 9 is a detailed view around the evaporator of the refrigeration cycle of the eighth embodiment.

【図１０】第九実施例の冷凍サイクル図FIG. 10 is a refrigeration cycle diagram of a ninth embodiment.

【図１１】第十実施例の冷凍サイクル図FIG. 11 is a refrigeration cycle diagram of a tenth embodiment.

【図１２】第十一実施例の冷凍サイクル図FIG. 12 is a refrigeration cycle diagram of an eleventh embodiment.

【図１３】第十二実施例の冷凍サイクル図FIG. 13 is a refrigeration cycle diagram of a twelfth embodiment.

【図１４】従来の冷凍サイクル図FIG. 14 is a diagram of a conventional refrigeration cycle.

[Explanation of symbols]

２０圧縮機２１凝縮器２３キャピラリチューブ２４蒸発器２６配管２７，３０オイル溜め器３１冷却装置３５断熱体４０加熱ヒータ４５補助キャピラリチューブ４６バイパス流路４７切換弁５２副キャピラリチューブ５３切換弁６２第一バイパス６３第二バイパス６４ａ，６４ｂ，６４ｃ，６４ｄ切換弁７０冷却ファン７１温度センサ８２補助凝縮器８３バイパス流路８４ａ，８４ｂ切換弁８８冷却用ファン９２通風ダクト９３通風調節ダクト９５加熱ヒータ DESCRIPTION OF SYMBOLS 20 Compressor 21 Condenser 23 Capillary tube 24 Evaporator 26 Piping 27, 30 Oil reservoir 31 Cooling device 35 Heat insulator 40 Heater 45 Auxiliary capillary tube 46 Bypass flow path 47 Switching valve 52 Sub-capillary tube 53 Switching valve 62 First Bypass 63 Second bypass 64a, 64b, 64c, 64d Switching valve 70 Cooling fan 71 Temperature sensor 82 Auxiliary condenser 83 Bypass flow path 84a, 84b Switching valve 88 Cooling fan 92 Ventilation duct 93 Ventilation control duct 95 Heating heater

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.⁶ 識別記号ＦＩＦ２５Ｂ 1/00 ３８１Ｆ２５Ｂ 1/00 ３８１Ｄ３８１Ｚ３８３３８３ 43/02 43/02 ＡＤ 47/00 47/00 Ａ (56)参考文献特開平６−137724（ＪＰ，Ａ) 特開平６−207764（ＪＰ，Ａ) 特開平６−159865（ＪＰ，Ａ) 特開平６−257900（ＪＰ，Ａ) 実開昭61−27072（ＪＰ，Ｕ) 実開平２−70166（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.⁶，ＤＢ名) F25B 1/00 F25B 43/00 F25B 43/02 F25B 47/00 ──────────────────────────────────────────────────続き Continuation of the front page (51) Int.Cl. ⁶ Identification code FI F25B 1/00 381 F25B 1/00 381D 381Z 383 383 43/02 43/02 A D 47/00 47/00 A (56) Reference Document JP-A-6-137724 (JP, A) JP-A-6-207764 (JP, A) JP-A-6-159865 (JP, A) JP-A-6-257900 (JP, A) 27072 (JP, U) Japanese Utility Model 2-70166 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F25B 1/00 F25B 43/00 F25B 43/02 F25B 47/00

Claims

(57) [Claims]

A compressor for compressing a gas refrigerant, a condenser for liquefying the compressed gas refrigerant, a capillary tube for decompressing the liquid refrigerant, and an evaporator for evaporating the liquid refrigerant are connected by pipes for refrigeration. In a refrigeration system in which a cycle is formed and the hydrofluorocarbon 134a is used as the refrigerant, an oil reservoir for separating and storing oil present in the pipe from the refrigerant is provided on the inlet side of the capillary tube. Characterized refrigeration equipment.

2. A compressor that compresses a gas refrigerant, a condenser that liquefies the compressed gas refrigerant, a capillary tube that decompresses the liquid refrigerant, and an evaporator that evaporates the liquid refrigerant is connected by a pipe to refrigerate. In a refrigerating apparatus in which a cycle is formed and a hydrofluorocarbon 134a is used as the refrigerant, an oil reservoir for separating and storing oil present in the pipe from the refrigerant is provided in a part of the evaporator, A refrigeration system comprising a cooling device for cooling a reservoir.

3. A refrigeration system according to claim 2, wherein the electronic refrigeration element is used in the cooling device.

4. A refrigeration system in which a compressor for compressing a gas refrigerant, a condenser for liquefying the compressed gas refrigerant, a capillary tube for decompressing the liquid refrigerant, and an evaporator for evaporating the liquid refrigerant are connected by piping. In a refrigerating apparatus in which a cycle is formed and a hydrofluorocarbon 134a is used as the refrigerant, an oil reservoir for separating and storing oil present in the pipe from the refrigerant is provided in a part of the evaporator, A refrigerating device, comprising: a heat insulator for insulating a reservoir.

5. A refrigeration system in which a compressor for compressing a gas refrigerant, a condenser for liquefying the compressed gas refrigerant, a capillary tube for decompressing the liquid refrigerant, and an evaporator for evaporating the liquid refrigerant are connected by piping. In a refrigeration system in which a cycle is formed and hydrofluorocarbon 134a is used as the refrigerant, a refrigerant inlet of the capillary tube
And heater for dissolving the oil deposited on the side, cold
The amount of oil circulating in the freezing cycle is normal.
A reference time that is shorter than the amount of time that hinders the ring
Refrigeration system, wherein said that the heater and control means for controlling actuation is provided with.

6. A compressor that compresses a gas refrigerant, a condenser that liquefies the compressed gas refrigerant, a capillary tube that decompresses the liquid refrigerant, and an evaporator that evaporates the liquid refrigerant is connected by a pipe to refrigerate. In a refrigeration system in which a cycle is formed and a hydrofluorocarbon 134a is used as the refrigerant, a length variable means for varying a length of the capillary tube, and a length of the capillary tube is reduced according to a driving time of the compressor. And a control unit.

7. An auxiliary capillary tube connected in series to a capillary tube, a bypass flow path formed in parallel with the auxiliary capillary tube, and a refrigerant flowing through the auxiliary capillary tube or the pipeline. 7. The refrigerating apparatus according to claim 6, further comprising: a switching valve that guides the refrigerant to the flow passage, wherein the switching valve is operated so that the refrigerant is guided to the bypass flow passage in accordance with a driving time of the compressor.

8. A refrigeration system in which a compressor for compressing the gas refrigerant, a condenser for liquefying the compressed gas refrigerant, a capillary tube for decompressing the liquid refrigerant, and an evaporator for evaporating the liquid refrigerant are connected by piping. In a refrigeration system in which a cycle is formed and the hydrofluorocarbon 134a is used as the refrigerant, an inner diameter changing unit that changes an inner diameter of the capillary tube, and an inner diameter of the capillary tube is increased according to a driving time of the compressor. A refrigeration apparatus comprising a control unit.

9. The inner diameter variable means includes a sub-capillary tube connected in parallel to the capillary tube and having an inner diameter larger than the capillary tube, and a switching valve for guiding the refrigerant to the capillary tube or the sub-capillary tube, The refrigeration apparatus according to claim 8, wherein the switching valve is operated such that the refrigerant is guided to the sub-capillary tube according to a driving time of the compressor.

10. A refrigeration system in which a compressor for compressing a gas refrigerant, a condenser for liquefying the compressed gas refrigerant, a capillary tube for decompressing the liquid refrigerant, and an evaporator for evaporating the liquid refrigerant are connected by piping. A cycle is formed, and in a refrigeration system in which hydrofluorocarbon 134a is used as the refrigerant, refrigerant recirculation means for recirculating the gas refrigerant compressed by the compressor from the evaporator to the condenser through the capillary tube to the condenser. And a control means for operating the refrigerant reverse circulation means in accordance with a driving time of the compressor.

11. The refrigerant reverse circulation means includes a first bypass connected from an outlet side of the compressor to an outlet side of the evaporator, and a second bypass connected from an inlet side of the condenser to an inlet side of the compressor. A plurality of switching valves provided at a connection portion of the first and second bypasses, so that the refrigerant is reversely circulated from the first bypass and guided to the second bypass according to a drive time of the compressor. The refrigeration apparatus according to claim 10, wherein the switching valve is operated.

12. A refrigeration system in which a compressor for compressing a gas refrigerant, a condenser for liquefying the compressed gas refrigerant, a capillary tube for decompressing the liquid refrigerant, and an evaporator for evaporating the liquid refrigerant are connected by piping. A cycle is formed, a cooling fan that sends out cool air from the evaporator is provided, and in a refrigeration system using hydrofluorocarbon 134a as the refrigerant, a temperature sensor that detects a temperature on an inlet side or an outlet side of the capillary tube; A refrigerating apparatus, further comprising control means for increasing an air volume of the cooling fan when a temperature of an inlet side or an outlet side of the capillary tube becomes lower than a predetermined temperature.

13. A refrigeration system in which a compressor for compressing a gas refrigerant, a condenser for liquefying the compressed gas refrigerant, a capillary tube for decompressing the liquid refrigerant, and an evaporator for evaporating the liquid refrigerant are connected by piping. A cycle is formed, in a refrigeration system using hydrofluorocarbon 134a as the refrigerant, a temperature sensor for detecting a temperature on an inlet side or an outlet side of the capillary tube, and a capacity changing unit for changing a capacity of the condenser, A refrigerating apparatus, further comprising control means for reducing the capacity of the condenser when the temperature on the inlet side or the outlet side of the capillary tube falls below a predetermined temperature.

14. A capacity changing means, comprising: an auxiliary condenser connected in series to a condenser; a bypass flow path formed in parallel with the auxiliary condenser; 14. A switching valve for guiding to the flow path, wherein the switching valve is operated such that the refrigerant is guided to the bypass path when the temperature detected by the temperature sensor becomes equal to or lower than a predetermined temperature. Refrigeration equipment.

15. A refrigeration system in which a compressor for compressing a gas refrigerant, a condenser for liquefying the compressed gas refrigerant, a capillary tube for decompressing the liquid refrigerant, and an evaporator for evaporating the liquid refrigerant are connected by piping. A cycle is formed, in a refrigerating apparatus using hydrofluorocarbon 134a as the refrigerant, a temperature sensor for detecting a temperature on an inlet side or an outlet side of the capillary tube, and a cooling fan for cooling the condenser, A refrigerating apparatus, further comprising control means for lowering the number of revolutions of the cooling fan when the temperature on the inlet side or the outlet side of the capillary tube falls below a predetermined temperature.

16. A refrigeration system in which a compressor for compressing a gas refrigerant, a condenser for liquefying the compressed gas refrigerant, a capillary tube for reducing the pressure of the liquid refrigerant, and an evaporator for evaporating the liquid refrigerant are connected by piping. A cycle is formed, in a refrigerating apparatus using hydrofluorocarbon 134a as the refrigerant, a temperature sensor for detecting a temperature on an inlet side or an outlet side of the capillary tube, and a cooling fan for cooling the condenser, A refrigerating apparatus, further comprising control means for stopping the driving of the cooling fan when the temperature on the inlet side or the outlet side of the capillary tube falls below a predetermined temperature.

17. A refrigeration system in which a compressor for compressing a gas refrigerant, a condenser for liquefying the compressed gas refrigerant, a capillary tube for decompressing the liquid refrigerant, and an evaporator for evaporating the liquid refrigerant are connected by piping. A cycle is formed, in a refrigeration system using hydrofluorocarbon 134a as the refrigerant, a temperature sensor for detecting the temperature of the inlet side or the outlet side of the capillary tube, and a cooling fan for cooling the condenser, A flow rate adjusting means for adjusting a flow rate from the cooling fan to the condenser; and a flow rate from the cooling fan to the condenser when a temperature at an inlet side or an outlet side of the capillary tube becomes lower than a predetermined temperature. A refrigeration apparatus comprising: control means for reducing the amount.

18. A ventilation amount adjusting means comprising a ventilation adjusting damper for opening and closing a ventilation duct disposed between a cooling fan and a condenser, wherein a temperature at an inlet side or an outlet side of the capillary tube is lower than a predetermined temperature. 18. The refrigeration apparatus according to claim 17, wherein the ventilation control damper is operated so as to reduce the opening / closing amount when the temperature becomes lower.

19. A refrigeration system in which a compressor for compressing a gas refrigerant, a condenser for liquefying the compressed gas refrigerant, a capillary tube for decompressing the liquid refrigerant, and an evaporator for evaporating the liquid refrigerant are connected by piping. In a refrigerating apparatus in which a cycle is formed and a hydrofluorocarbon 134a is used as the refrigerant, a temperature sensor for detecting a temperature on an inlet side or an outlet side of the capillary tube, a heater for heating the condenser, and the capillary tube Control means for operating the heater when the temperature on the inlet side or the outlet side of the heater falls below a predetermined temperature.