JP2001201190A - Ammonia refrigerating apparatus - Google Patents
Ammonia refrigerating apparatusInfo
- Publication number
- JP2001201190A JP2001201190A JP2000009049A JP2000009049A JP2001201190A JP 2001201190 A JP2001201190 A JP 2001201190A JP 2000009049 A JP2000009049 A JP 2000009049A JP 2000009049 A JP2000009049 A JP 2000009049A JP 2001201190 A JP2001201190 A JP 2001201190A
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- JP
- Japan
- Prior art keywords
- ammonia
- evaporator
- pipe
- compressor
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、アンモニア冷凍装
置に関し、詳細にはアンモニアを主成分とする冷媒を用
いた冷凍装置に関するものである。The present invention relates to an ammonia refrigeration apparatus, and more particularly to a refrigeration apparatus using a refrigerant containing ammonia as a main component.
【０００２】[0002]
【従来の技術】アンモニア冷凍装置の改善技術を提案し
たものに、例えば特許第 2977046号公報がある。そし
て、同公報の背景技術の項には従来のアンモニア冷凍装
置について「従来、冷凍装置の冷媒としてはフロンが広
く用いられてきたが、フロンは大気中に放出され蓄積さ
れると、太陽の紫外線によって分解し塩素原子を生じ、
地球を太陽の強い紫外線から守る働きをもつオゾン層を
破壊することから、その使用が制限されるようになって
きた。そこで、近年フロンの代替冷媒としてアンモニア
が見直されてきている。上記アンモニア冷媒は、フロン
のような地球環境破壊のおそれはなく、その冷凍効果は
フロンのそれとほとんど変わらず、また安価である。た
だ、アンモニアは特異な臭気を有し可燃性であり、また
圧縮機の潤滑油として使用する鉱物油に非溶解性であ
り、更に圧縮機よりの吐出温度が高いなどの欠点を有す
るために、これらの欠点により不具合が生じないような
冷凍システム構成がとられている。」と説明した上で、
更に従来のアンモニア冷凍装置の具体的な構成を図６
（公報の第６図に該当）及び図７（公報の第７図に該
当）に基づいて次のように説明されている。2. Description of the Related Art For example, Japanese Patent No. 2977046 discloses a technique for improving an ammonia refrigeration system. In the background art section of the publication, the conventional ammonia refrigerating apparatus is described as follows. "Conventionally, chlorofluorocarbon has been widely used as a refrigerant for the refrigeration apparatus. Decomposes to produce chlorine atoms,
The destruction of the ozone layer, which protects the Earth from the sun's strong ultraviolet radiation, has limited its use. Thus, ammonia has recently been reviewed as an alternative refrigerant to CFCs. The ammonia refrigerant has no risk of destruction of the global environment like CFCs, and its refrigeration effect is almost the same as that of CFCs and is inexpensive. However, since ammonia has a peculiar odor and is flammable, it is insoluble in mineral oil used as a lubricating oil for a compressor, and it has drawbacks such as a higher discharge temperature from the compressor. A refrigeration system configuration that does not cause problems due to these drawbacks is adopted. "
FIG. 6 shows a specific configuration of a conventional ammonia refrigeration apparatus.
(Corresponding to FIG. 6 of the gazette) and FIG. 7 (corresponding to FIG. 7 of the gazette) as follows.
【０００３】50は蒸発器側で例えば−10℃、凝縮器側で
＋35℃前後の熱を得るための単段圧縮タイプの直接膨張
式冷凍システムで、その構成を作用を中心に説明する
と、冷媒圧縮機51で圧縮された油混合アンモニア冷媒
は、油分離器52で油を分離した後、凝縮器53内で冷却水
64との熱交換（取得熱：35℃前後）により凝縮器53内で
凝縮液化される。Reference numeral 50 denotes a single-stage compression type direct expansion refrigeration system for obtaining heat of, for example, -10.degree. C. on the evaporator side and about + 35.degree. C. on the condenser side. The oil-mixed ammonia refrigerant compressed by the compressor 51 is separated into oil by the oil separator 52 and then cooled by the cooling water in the condenser 53.
It is condensed and liquefied in the condenser 53 by heat exchange with the 64 (acquisition heat: around 35 ° C.).
【０００４】そして、該凝縮時に液化分離した油を更に
高圧受液器54底部に設けた油溜め55で分離した後、アン
モニア冷媒を膨張弁56により減圧気化させ、蒸発器57内
でファン58より供給された送風負荷と熱交換（取得熱：
−10℃）した後、更にアンモニア液／油分離器59を介し
て圧縮機51の吸気側に吸引され前記冷凍サイクルを繰り
返す。[0004] After the oil liquefied and separated at the time of the condensation is further separated by an oil reservoir 55 provided at the bottom of the high-pressure receiver 54, the ammonia refrigerant is decompressed and vaporized by an expansion valve 56, and is sent from a fan 58 in an evaporator 57. Heat exchange with supplied blast load (acquired heat:
(−10 ° C.), and further sucked into the suction side of the compressor 51 via the ammonia liquid / oil separator 59 to repeat the refrigeration cycle.
【０００５】そして、前記油分離器52、高圧受液器54底
部の油溜め55及び蒸発器57の底部溜まった油は何れも油
抜き弁60a, 60b, 60c, 60dを介して油受液器61に溜ま
り、再度圧縮機51の油噴射部52a より前記圧縮機51内に
戻入れされ、可動部分の潤滑、シール及び冷却等を行
う。[0005] The oil separator 52, the oil sump 55 at the bottom of the high-pressure receiver 54 and the oil collected at the bottom of the evaporator 57 are all passed through oil drain valves 60a, 60b, 60c and 60d. The fluid accumulates at 61 and is returned into the compressor 51 from the oil injection section 52a of the compressor 51 again to perform lubrication, sealing, cooling, and the like of the movable part.
【０００６】なお、前記冷凍装置50は凝縮器53側より熱
を取り出すことによりヒートポンプ装置として応用でき
ることは周知であり、従ってこれらを総称して冷凍装置
という。It is well known that the refrigerating device 50 can be applied as a heat pump device by extracting heat from the condenser 53 side. Therefore, these are collectively called a refrigerating device.
【０００７】さて前記潤滑油には一般にパラフィン系、
ナフテン系等の鉱物系潤滑油を用いているが、これらの
潤滑油はアンモニアと溶解しないために、前記圧縮機の
吐出側に油分離器を設け、前記圧縮機より吐出されたア
ンモニアガスと潤滑油を分離し、更に前記分離器を設け
ていてもミスト状化した潤滑油を完全に取り切れず、
又、前記圧縮機は高温化しているために、アンモニア中
に潤滑油が僅かに溶解若しくはミストが混入し、該アン
モニアに同伴して冷凍サイクル内に入り込み、そしてサ
イクル内に入り込んだ潤滑油は、アンモニアに対し非溶
解で且つ比重が重いために、前記サイクルの配管経路に
溜まりやすく、このため前記高圧受液部54の底部、蒸発
器57の下部入口側に夫々油抜き部55、60を、又圧縮機51
の吸気側にも油分離器59を設けねばならず、しかもこれ
らの分離油は油受液器61で回収した後、再度圧縮機に戻
す必要があり、構成が極めて煩雑化する。[0007] The lubricating oils are generally paraffinic,
Although mineral lubricating oils such as naphthenic oils are used, since these lubricating oils do not dissolve in ammonia, an oil separator is provided on the discharge side of the compressor, and the lubricating oil is lubricated with the ammonia gas discharged from the compressor. Separates oil, and even if the separator is provided, mist-like lubricating oil cannot be completely removed,
Further, since the compressor is heated to a high temperature, the lubricating oil is slightly dissolved or mist mixed in the ammonia, enters the refrigeration cycle with the ammonia, and the lubricating oil that has entered the cycle is Because it is insoluble in ammonia and has a high specific gravity, it is easy to accumulate in the piping path of the cycle, and therefore, at the bottom of the high-pressure liquid receiving part 54, the oil draining parts 55 and 60 at the lower inlet side of the evaporator 57, respectively. Also compressor 51
The oil separator 59 must also be provided on the intake side of the oil tank, and it is necessary to collect these separated oils in the oil receiver 61 and then return the oil to the compressor again, which makes the configuration extremely complicated.
【０００８】又前記のように潤滑油が冷媒に対し非溶解
であることは、凝縮器53や蒸発器57内の熱交換コイル壁
面に前記油が付着し伝熱効率が低下するのみならず、特
に低温度の蒸発器においては、油の粘度が高くなり且つ
油抜き流動性が下がり、伝熱効率が一層低下する。In addition, the fact that the lubricating oil is not dissolved in the refrigerant as described above means that the oil adheres to the wall of the heat exchange coil in the condenser 53 and the evaporator 57, thereby lowering the heat transfer efficiency. In a low-temperature evaporator, the viscosity of the oil increases and the oil drainage fluidity decreases, and the heat transfer efficiency further decreases.
【０００９】このため前記非溶解性の油を蒸発器57の入
口側で極力分離する必要があるが、それには膨張弁56通
過後の減圧冷媒を蒸発器57の上方より導入しようとする
と、例え特別な分離器を用いても比重差により蒸発器57
内に入り込むので防ぐことができず、このため前記構成
のシステムにおいては蒸発器57の底側に導入部を設けた
いわゆるボトムフィード構造を取らざるを得ない。For this reason, it is necessary to separate the insoluble oil at the inlet side of the evaporator 57 as much as possible. For example, when the decompressed refrigerant after passing through the expansion valve 56 is introduced from above the evaporator 57, for example, Even if a special separator is used, the evaporator 57
Therefore, in the system having the above-described structure, a so-called bottom feed structure in which an introduction portion is provided on the bottom side of the evaporator 57 has to be adopted.
【００１０】しかしながらボトムフィード構造を取る
と、必然的に冷媒を蒸発器57の高さに対応する重力に抗
して蒸発器上端より排出可能な、いわゆる満液構造を取
らざるを得ず、結果として冷凍サイクル内に多くの冷媒
を必要とする。However, when the bottom feed structure is employed, a so-called full structure, in which the refrigerant is necessarily discharged from the upper end of the evaporator against the gravity corresponding to the height of the evaporator 57, must be employed. Requires many refrigerants in the refrigeration cycle.
【００１１】さて前記したアンモニア冷凍システムはそ
の使用限界が−20℃前後であるが、近年産業用プロセス
の温度が著しく低下し、特に食品業界においては解凍時
の脂肪の融出防止その他の品質保持の面より要求冷凍温
度が−30℃から以下が殆どであり、特にマグロ等の高価
格食品においては冷凍保存温度は−50℃〜−60℃と大幅
に低くなっている。The above-mentioned ammonia refrigeration system has a service limit of about -20 ° C. However, in recent years, the temperature of industrial processes has been remarkably reduced, and especially in the food industry, prevention of melting of fat at the time of thawing and other quality maintenance are required. In most cases, the required freezing temperature is from −30 ° C. to the following. In particular, in the case of high-priced foods such as tuna, the frozen storage temperature is significantly low at −50 ° C. to −60 ° C.
【００１２】そしてこのような凍結温度は前記のような
単段圧縮機では得ることができず、通常は２段圧縮機を
用いているが、前記従来技術のように、前記蒸発器温度
が−40℃以下に冷却した場合、潤滑油の流動性が大幅に
低下し、蒸発器内に詰まり等が生じやすい。[0012] Such a freezing temperature cannot be obtained by the single-stage compressor as described above, and usually a two-stage compressor is used. When the temperature is cooled to 40 ° C. or lower, the fluidity of the lubricating oil is significantly reduced, and the evaporator is easily clogged.
【００１３】かかる欠点を解消するために、図７に示す
ような極低温アンモニア二段圧縮式液ポンプ再循環シス
テムが提案されている。In order to solve such a drawback, a cryogenic ammonia two-stage compression type liquid pump recirculation system as shown in FIG. 7 has been proposed.
【００１４】その構成を前記従来技術の差異を中心に簡
単に説明するに、高圧受液器54より液管66に排出された
凝縮液は膨張弁67により中間冷却器68内を冷却し、一方
前記液管66の終端側は、中間冷却器68内の過冷却管69内
に導入され、該過冷却管69内で−10℃前後に冷却した
後、膨張弁67により減圧気化させて低圧受液器70内に導
入する。この結果前記受液器70内には−40℃〜−50℃以
下に冷却された冷媒液が貯溜されることになる。The structure will be briefly described focusing on the difference from the above-mentioned prior art. The condensate discharged from the high-pressure receiver 54 to the liquid pipe 66 cools the inside of the intercooler 68 by the expansion valve 67. The terminal end of the liquid pipe 66 is introduced into a supercooling pipe 69 in an intercooler 68, and after cooling to about −10 ° C. in the supercooling pipe 69, the liquid is cooled down and vaporized by an expansion valve 67 to receive a low pressure. It is introduced into the liquid container 70. As a result, the refrigerant liquid cooled to −40 ° C. to −50 ° C. or lower is stored in the receiver 70.
【００１５】そしてこの冷媒液を液ポンプ71及び流量調
整弁72を介して蒸発器73に導き、該蒸発器73内でファン
74より供給された送風負荷との熱交換（取得熱例：−40
℃）により蒸発した冷媒は、再度低圧受液器70内に導入
されて冷却且つ凝縮液化される。The refrigerant liquid is led to an evaporator 73 via a liquid pump 71 and a flow control valve 72.
Heat exchange with blast load supplied from 74 (Example of acquired heat: -40
The refrigerant evaporated by (° C) is again introduced into the low-pressure receiver 70 to be cooled and condensed and liquefied.
【００１６】一方前記低圧受液器70内の気化冷媒は、低
段圧縮機75に吸入され且つ圧縮されてその圧縮ガスは中
間冷却器68内で冷却されて、中間冷却器68内の熱交換用
過冷却管69に導入されて前記液管66よりの凝縮冷媒を−
10℃前後に過冷却し、膨張弁67により減圧気化させて低
圧受液器70内に導入する。そして中間冷却器68内の気化
冷媒は、高段圧縮機51' で圧縮されて前記サイクルを繰
り返す。On the other hand, the vaporized refrigerant in the low-pressure liquid receiver 70 is sucked into the low-stage compressor 75 and compressed, and the compressed gas is cooled in the intercooler 68 and heat exchange in the intercooler 68 is performed. The condensed refrigerant introduced into the liquid supercooling pipe 69 and flowing from the liquid pipe 66 is
It is supercooled to about 10 ° C., decompressed and vaporized by the expansion valve 67, and introduced into the low-pressure receiver 70. Then, the vaporized refrigerant in the intercooler 68 is compressed by the high-stage compressor 51 ', and the cycle is repeated.
【００１７】そして前記高圧受液器54、中間冷却器68、
低圧受液器70のいずれの底部にも油溜まり55, 68a, 70a
を設け、これらの分離油は油受液器61で回収した後、再
度圧縮機51', 75 側の油噴射器51a, 75aに戻す。なお、
図中76は液面フロート弁である。The high-pressure receiver 54, the intercooler 68,
Oil pool 55, 68a, 70a at any bottom of low pressure receiver 70
After collecting these separated oils in the oil receiver 61, they are returned to the oil injectors 51a and 75a on the compressors 51 'and 75 side again. In addition,
In the figure, reference numeral 76 denotes a liquid level float valve.
【００１８】しかしながら、かかる従来技術において
も、油回収構成の煩雑化や、伝熱効率の低下等の基本的
な欠点が解消されないのみならず、特に前記低圧受液器
70側では、−40℃〜−50℃に冷却された冷媒液が貯溜さ
れることになるために、その油溜めに貯溜された潤滑油
も同じく−40℃〜−50℃前後に冷却され、流動性が大幅
に低下し前記油抜きを行うには油の温度を一時的に上げ
ねばならず、結果として冷凍サイクルの連続運転に支障
が生じ、前記油が所定量貯溜される毎に前記サイクルを
停止し油回収を図るためのメンテナンスが必要となる。However, even in the prior art, not only the basic drawbacks such as the complicated oil recovery structure and the decrease in heat transfer efficiency are not solved, but also the low-pressure receiver is particularly difficult.
On the 70 side, the refrigerant liquid cooled to -40 ° C to -50 ° C is stored, so the lubricating oil stored in the oil reservoir is also cooled to about -40 ° C to -50 ° C, In order to perform the oil removal, the oil temperature has to be temporarily increased so that the continuous operation of the refrigeration cycle is hindered, and the cycle is repeated every time a predetermined amount of the oil is stored. And maintenance is required to recover the oil.
【００１９】[0019]
【発明が解決しようとする課題】上記特許第 2977046号
公報では、従来のアンモニア冷凍装置について上記のよ
うに説明した上で、その改善策として、アンモニア冷媒
と相溶性が極めて良好で、しかも潤滑性及び安定性にも
優れた潤滑油とアンモニア冷媒とを混合した冷凍機用作
動流体組成物が提案されるとともに、その冷凍機用作動
流体組成物を用いた冷凍装置が提案されている。In the above-mentioned Japanese Patent No. 2977046, the conventional ammonia refrigerating apparatus is described as above, and as a measure for improving the refrigerating apparatus, the compatibility with the ammonia refrigerant is extremely good and the lubricating property is improved. In addition, a working fluid composition for a refrigerating machine in which a lubricating oil excellent in stability and an ammonia refrigerant are mixed is proposed, and a refrigerating apparatus using the working fluid composition for a refrigerating machine is proposed.
【００２０】上記提案の冷凍装置では、潤滑油がアンモ
ニア冷媒に溶解していることから、従来の冷凍装置のよ
うに配管経路に潤滑油が分離して溜まることがなくな
り、これにより油回収システムが不要で、構成が簡素化
される利点を有するものの、アンモニア冷媒に溶解する
油（ポリアルキレングリコールやポリエーテル）は、吸
湿性が高く、水分が冷凍システム内に入りやすい。水分
が冷凍システム内に入ると、冷凍機油を劣化させたり、
膨張弁で氷結したり、吸い込みフィルタ部で氷結した
り、様々な問題を引き起こすことが懸念される。In the refrigeration system proposed above, since the lubricating oil is dissolved in the ammonia refrigerant, the lubricating oil does not separate and accumulate in the piping path unlike the conventional refrigeration system. Although it is unnecessary and has the advantage of simplifying the structure, oil (polyalkylene glycol or polyether) dissolved in the ammonia refrigerant has high hygroscopicity and water easily enters the refrigeration system. When moisture enters the refrigeration system, it can degrade refrigeration oil,
It is feared that ice may be frozen at the expansion valve, ice may be frozen at the suction filter unit, and various problems may occur.
【００２１】そこで、本発明は、上述の如き冷凍装置の
問題点に着目してなしたものであって、その目的は、上
記のようなアンモニア冷媒に溶解する油（冷凍機用作動
流体組成物）を用いることなく非溶解の油を用いるとと
もに、冷凍サイクルを停止して油回収を図ることなく連
続運転が可能なアンモニア冷凍装置を提供するものであ
る。Accordingly, the present invention has been made in view of the above-mentioned problems of the refrigeration apparatus, and has as its object to provide an oil (a working fluid composition for a refrigerator) which is dissolved in an ammonia refrigerant as described above. The present invention provides an ammonia refrigeration apparatus that uses undissolved oil without using) and allows continuous operation without stopping the refrigeration cycle and recovering oil.
【００２２】[0022]
【課題を解決するための手段】上記の目的を達成するた
めに本発明者が調査検討した結果、圧縮機、油分離器、
凝縮器、膨張弁、蒸発器をこの順に備え、アンモニアを
冷媒として使用するアンモニア冷凍装置においては、ア
ンモニア冷媒に溶解しない非溶解性の油（例えばパラフ
ィン系、ナフテン系等の鉱物系潤滑油）は、アンモニア
と溶解しないために、その比重差（アンモニア：40℃液
の比重約0.58、−40℃液の比重約0.69、鉱物系潤滑油の
比重約0.9)により凝縮器から膨張弁、更には蒸発器に至
る間の機器又は／及び管路等の下部に溜まることが確認
された。そして、本発明者が更に調査検討したところに
よれば、これら分離油が溜まる位置の圧力は、冷凍装置
が稼働しているときは、圧縮機の入側管路の圧力や、圧
縮機の吸込ポート及び吐出ポートに連通しないとじ込み
位置の圧力よりも高いことが判明した。As a result of investigations and studies by the present inventor to achieve the above object, a compressor, an oil separator,
In an ammonia refrigerating apparatus that includes a condenser, an expansion valve, and an evaporator in this order and uses ammonia as a refrigerant, insoluble oils that do not dissolve in the ammonia refrigerant (for example, mineral lubricating oils such as paraffinic and naphthenic) are used. Due to its specific gravity difference (ammonia: specific gravity of 40 ° C liquid about 0.58, specific gravity of -40 ° C liquid about 0.69, mineral lubricating oil about 0.9), it does not dissolve with ammonia, so the expansion valve from the condenser and further evaporation It has been confirmed that the liquid accumulates in the lower part of the equipment or / and the pipeline etc. leading to the vessel. According to further investigations and examinations by the present inventors, the pressure at the position where these separated oils accumulate is, when the refrigeration apparatus is operating, the pressure in the inlet pipe of the compressor or the suction pressure of the compressor. It was found that the pressure was higher than the pressure at the snap-in position unless communicating with the port and the discharge port.
【００２３】本発明は上記の如き知見に基づいてなした
ものであって、請求項１に係る本発明のアンモニア冷凍
装置は、圧縮機、油分離器、凝縮器、膨張弁、蒸発器を
この順に備え、アンモニアを冷媒として使用するアンモ
ニア冷凍装置において、凝縮器から膨張弁に至る間の機
器又は／及び管路と圧縮機のとじ込み位置との間に、凝
縮器から膨張弁に至る間の機器又は／及び管路に溜まる
冷凍機油を戻す管路が設けられてなるものである。The present invention has been made based on the above findings, and the ammonia refrigeration apparatus of the present invention according to claim 1 comprises a compressor, an oil separator, a condenser, an expansion valve, and an evaporator. In an ammonia refrigeration system using ammonia as a refrigerant, a device between the condenser and the expansion valve or / and a device between the condenser and the expansion valve between the pipe and the binding position of the compressor. And / or a pipe for returning the refrigerating machine oil accumulated in the pipe is provided.
【００２４】請求項２に係る本発明のアンモニア冷凍装
置は、請求項１に記載のアンモニア冷凍装置において、
圧縮機が二段圧縮機であって、冷凍機油を戻す管路が一
段目圧縮機のとじ込み位置に接続されてなるものであ
る。According to a second aspect of the present invention, there is provided the ammonia refrigeration apparatus according to the first aspect.
The compressor is a two-stage compressor, and a pipeline for returning the refrigerating machine oil is connected to a binding position of the first-stage compressor.
【００２５】請求項３に係る本発明のアンモニア冷凍装
置は、請求項１に記載のアンモニア冷凍装置において、
圧縮機が二段圧縮機であって、冷凍機油を戻す管路が二
段目圧縮機のとじ込み位置に接続されてなるものであ
る。According to a third aspect of the present invention, there is provided the ammonia refrigeration apparatus according to the first aspect.
The compressor is a two-stage compressor, and a pipeline for returning refrigerating machine oil is connected to a binding position of the second-stage compressor.
【００２６】請求項４に係る本発明のアンモニア冷凍装
置は、請求項１に記載のアンモニア冷凍装置において、
圧縮機が二段圧縮機であって、冷凍機油を戻す管路が一
段目圧縮機と二段目圧縮機の間に接続されてなるもので
ある。According to a fourth aspect of the present invention, there is provided the ammonia refrigerating apparatus according to the first aspect.
The compressor is a two-stage compressor, and a pipeline for returning refrigerating machine oil is connected between the first-stage compressor and the second-stage compressor.
【００２７】請求項５に係る本発明のアンモニア冷凍装
置は、圧縮機、油分離器、凝縮器、膨張弁、蒸発器をこ
の順に備え、アンモニアを冷媒として使用するアンモニ
ア冷凍装置において、膨張弁と蒸発器の間の管路と蒸発
器と圧縮機の間の管路との間に、膨張弁と蒸発器の間の
管路に溜まる冷凍機油を戻す管路が設けられてなるもの
である。According to a fifth aspect of the present invention, there is provided an ammonia refrigerating apparatus including a compressor, an oil separator, a condenser, an expansion valve, and an evaporator in this order. Between the pipe between the evaporator and the pipe between the evaporator and the compressor, a pipe for returning the refrigerating machine oil accumulated in the pipe between the expansion valve and the evaporator is provided.
【００２８】請求項６に係る本発明のアンモニア冷凍装
置は、請求項１乃至４に記載の何れかのアンモニア冷凍
装置において、膨張弁と蒸発器の間の管路と蒸発器と圧
縮機の間の管路との間に、膨張弁と蒸発器の間の管路に
溜まる冷凍機油を戻す管路が設けられてなるものであ
る。According to a sixth aspect of the present invention, there is provided the ammonia refrigeration apparatus according to any one of the first to fourth aspects, wherein a line between the expansion valve and the evaporator and a line between the evaporator and the compressor are provided. Between the expansion valve and the evaporator, a pipe for returning the refrigerating machine oil accumulated in the pipe between the expansion valve and the evaporator.
【００２９】請求項７に係る本発明のアンモニア冷凍装
置は、圧縮機、油分離器、凝縮器、膨張弁、蒸発器をこ
の順に備え、アンモニアを冷媒として使用するアンモニ
ア冷凍装置において、蒸発器が直膨式蒸発器であって、
その直膨式蒸発器の管路と蒸発器と圧縮機の間の管路と
の間に、直膨式蒸発器の管路に溜まる冷凍機油を戻す管
路が設けられてなるものである。According to a seventh aspect of the present invention, there is provided an ammonia refrigerating apparatus including a compressor, an oil separator, a condenser, an expansion valve, and an evaporator in this order. A direct expansion evaporator,
Between the pipe line of the direct expansion type evaporator and the pipe line between the evaporator and the compressor, a pipe line for returning the refrigerating machine oil accumulated in the pipe line of the direct expansion type evaporator is provided.
【００３０】請求項８に係る本発明のアンモニア冷凍装
置は、請求項１乃至４に記載の何れかのアンモニア冷凍
装置において、蒸発器が直膨式蒸発器であって、その直
膨式蒸発器の管路と蒸発器と圧縮機の間の管路との間
に、直膨式蒸発器の管路に溜まる冷凍機油を戻す管路が
設けられてなるものである。According to an eighth aspect of the present invention, there is provided the ammonia refrigerating apparatus according to any one of the first to fourth aspects, wherein the evaporator is a direct expansion type evaporator, and the direct expansion type evaporator is provided. And a pipe for returning the refrigerating machine oil accumulated in the pipe of the direct expansion type evaporator is provided between the pipe and the pipe between the evaporator and the compressor.
【００３１】[0031]
【発明の実施の形態】以下、本発明の実施形態を図面に
基づいて説明する。図１は、本発明に係るアンモニア冷
凍装置の模式図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of an ammonia refrigeration apparatus according to the present invention.
【００３２】この例のアンモニア冷凍装置Ａは、単段ス
クリュ圧縮機１、油分離器２、凝縮器３、膨張弁４、蒸
発器５をこの順に備えるとともに、これら各機器との間
には管路６〜10が設けられて構成され、更に、本例で
は、凝縮器３の下部11と単段スクリュ圧縮機１のとじ込
み位置12との間、及び凝縮器３と膨張弁４の間で分離油
が溜まりやすい位置の管路８の下部（図では液溜まりと
なる低い所を管断面で示す）13と単段スクリュ圧縮機１
のとじ込み位置12との間のそれぞれに、凝縮器３の下部
11と管路８の下部13に分離して溜まった冷凍機油を戻す
管路14, 15を設けて構成した。The ammonia refrigerating apparatus A of this example includes a single-stage screw compressor 1, an oil separator 2, a condenser 3, an expansion valve 4, and an evaporator 5 in this order, and a pipe is provided between these devices. In the present embodiment, furthermore, in the present example, the separation between the lower part 11 of the condenser 3 and the binding position 12 of the single-stage screw compressor 1 and the separation between the condenser 3 and the expansion valve 4 are performed. The lower part of the pipe 8 at the position where the oil easily accumulates (the lower part where the liquid pool is shown in the figure is a cross section of the pipe) 13 and the single-stage screw compressor 1
Between the binding position 12 and the lower part of the condenser 3
Pipes 14 and 15 for returning the refrigerating machine oil separated and accumulated in the pipe 11 and the lower portion 13 of the pipe 8 are provided.
【００３３】上記構成のアンモニア冷凍装置Ａでは、冷
凍稼働中、単段スクリュ圧縮機１のとじ込み位置12の圧
力は約0.35MPa であるのに対して凝縮器３内と管路８内
の圧力は約1.4MPaと高く、この圧力差により凝縮器３の
下部11と管路８の下部13に分離して溜まった冷凍機油は
加圧され管路14及び15内をそれぞれ単段スクリュ圧縮機
１のとじ込み位置12へと戻される。このように圧力差が
大きい場合には管路14及び15内にオリフィス（図示せ
ず）を設けて油の戻し量を調整するようにしてもよい。In the ammonia refrigerating apparatus A having the above-described structure, during the freezing operation, the pressure at the binding position 12 of the single-stage screw compressor 1 is about 0.35 MPa, whereas the pressure in the condenser 3 and the pressure in the pipe 8 are The pressure difference is as high as about 1.4 MPa, and due to this pressure difference, the refrigerating machine oil separated and accumulated in the lower part 11 of the condenser 3 and the lower part 13 of the pipe 8 is pressurized and flows through the pipes 14 and 15 in the single-stage screw compressor 1 respectively. It is returned to the binding position 12. When the pressure difference is large as described above, orifices (not shown) may be provided in the pipes 14 and 15 to adjust the oil return amount.
【００３４】上記アンモニア冷凍装置Ａでは、凝縮器３
の下部11と管路８の下部13に分離して溜まった冷凍機油
は、上記のようにして管路14及び15内をそれぞれ単段ス
クリュ圧縮機１のとじ込み位置12へと戻されるので、ア
ンモニア冷凍装置Ａを停止させることなく冷凍運転状態
で溜まった冷凍機油を戻すことができ、アンモニア冷凍
装置Ａの連続運転が可能で稼働率の向上が期待できる。In the ammonia refrigerating apparatus A, the condenser 3
The refrigerating machine oil separated and accumulated in the lower part 11 of the pipe 8 and the lower part 13 of the pipe 8 is returned to the binding position 12 of the single-stage screw compressor 1 through the pipes 14 and 15 as described above. It is possible to return the refrigerating machine oil accumulated in the refrigerating operation state without stopping the refrigerating apparatus A, and it is possible to continuously operate the ammonia refrigerating apparatus A and to expect an improvement in the operation rate.
【００３５】なお、上記アンモニア冷凍装置Ａの例で
は、分離した冷凍機油の戻し管路を凝縮器３の下部11と
管路８の下部13の二箇所に設けた例を説明したが、油の
溜まりやすいいずれか一箇所であってもよいし、図１に
二点鎖線で併せて図示するように、膨張弁４と蒸発器５
の間の管路９と蒸発器５と単段スクリュ圧縮機１の間の
管路10との間に、膨張弁４と蒸発器５の間の管路９の下
部（図では液溜まりとなる低い所を管断面で示す）16に
溜まる冷凍機油を戻す管路17を設け、この管路17を前記
凝縮器３の下部11と管路８の下部13の二箇所に設けた管
路14, 15と併せて又は単独で設けるように構成してもよ
い。このように管路17を設けても膨張弁４と蒸発器５の
間の管路９の下部16に溜まった冷凍機油をアンモニア冷
凍装置Ａを停止させることなく冷凍運転状態で戻すこと
ができ、アンモニア冷凍装置Ａの連続運転が可能で稼働
率の向上が期待できる。In the above-described example of the ammonia refrigerating apparatus A, an example has been described in which return pipes for the separated refrigerating machine oil are provided at two places, a lower part 11 of the condenser 3 and a lower part 13 of the pipe 8. It may be any one of the locations where it is easy to accumulate, or as shown in FIG.
Between the expansion valve 4 and the evaporator 5 between the pipe 9 between the evaporator 5 and the single-stage screw compressor 1 (a liquid pool in the figure). A pipe 17 for returning the refrigerating machine oil accumulated in 16 is provided, and the pipe 17 is provided at two places, a lower part 11 of the condenser 3 and a lower part 13 of the pipe 8. You may comprise so that it may be provided together with 15 or independently. Thus, even if the pipe 17 is provided, the refrigerating machine oil accumulated in the lower portion 16 of the pipe 9 between the expansion valve 4 and the evaporator 5 can be returned in a refrigeration operation state without stopping the ammonia refrigeration apparatus A, The continuous operation of the ammonia refrigeration system A is possible, and an improvement in the operation rate can be expected.
【００３６】図２は、本発明に係る別の実施形態のアン
モニア冷凍装置の模式図である。FIG. 2 is a schematic view of an ammonia refrigeration apparatus according to another embodiment of the present invention.
【００３７】この例のアンモニア冷凍装置Ｂは、上記例
のアンモニア冷凍装置Ａにおける単段スクリュ圧縮機１
を二段スクリュ圧縮機18に変更した外は基本的にアンモ
ニア冷凍装置Ａと同様の構成であって、二段スクリュ圧
縮機18、油分離器19、凝縮器20、膨張弁21、蒸発器22を
この順に備えるとともに、これら各機器との間には管路
23〜27が設けられて構成され、更に、本例では、凝縮器
20の下部28と二段スクリュ圧縮機18の一段目スクリュ圧
縮機18a のとじ込み位置29a との間、及び凝縮器20と膨
張弁21の間で分離油が溜まりやすい位置の管路25の下部
（図では液溜まりとなる低い所を管断面で示す）30と一
段目スクリュ圧縮機18a のとじ込み位置29a との間のそ
れぞれに、凝縮器20の下部28と管路25の下部30に分離し
て溜まった冷凍機油を戻す管路31, 32を設けて構成し
た。The ammonia refrigerating apparatus B of this example is a single-stage screw compressor 1 of the ammonia refrigerating apparatus A of the above example.
The configuration is basically the same as that of the ammonia refrigerating apparatus A except that the two-stage screw compressor 18 is replaced with a two-stage screw compressor 18, an oil separator 19, a condenser 20, an expansion valve 21, and an evaporator 22. Are installed in this order, and a pipeline is connected between these devices.
23 to 27 are provided and further, in this example, a condenser
The lower part of the conduit 25 between the lower part 28 of the second 20 and the binding position 29a of the first-stage screw compressor 18a of the second-stage screw compressor 18 and the position where the separated oil easily accumulates between the condenser 20 and the expansion valve 21 ( In the figure, the lower part that becomes a liquid pool is shown in the cross section of the pipe) 30 and the lower part 28 of the condenser 20 and the lower part 30 of the pipe line 25, respectively, between the stapling position 29a of the first screw compressor 18a Pipes 31 and 32 for returning the accumulated refrigerating machine oil were provided.
【００３８】上記構成のアンモニア冷凍装置Ｂでは、冷
凍稼働中、二段スクリュ圧縮機18のとじ込み位置29a の
圧力は約0.1MPaであるのに対して凝縮器20内と管路25内
の圧力は約1.4MPaと高く、この圧力差により凝縮器20の
下部28と管路25の下部30に分離して溜まった冷凍機油は
加圧され管路31及び32内をそれぞれ二段スクリュ圧縮機
18の一段目スクリュ圧縮機18a のとじ込み位置29a へと
戻される。このように圧力差が大きい場合には管路31及
び32内にオリフィス（図示せず）を設けて油の戻し量を
調整するようにしてもよい。In the ammonia refrigerating apparatus B having the above-described structure, the pressure at the binding position 29a of the two-stage screw compressor 18 during the freezing operation is about 0.1 MPa, while the pressure in the condenser 20 and the pressure in the pipe 25 are Refrigeration oil separated and accumulated in the lower part 28 of the condenser 20 and the lower part 30 of the pipe 25 is pressurized by this pressure difference, and is pressurized in the pipes 31 and 32, respectively.
It is returned to the binding position 29a of the first-stage screw compressor 18a. When the pressure difference is large, orifices (not shown) may be provided in the conduits 31 and 32 to adjust the amount of oil returned.
【００３９】上記アンモニア冷凍装置Ｂでも、上記アン
モニア冷凍装置Ａ同様に凝縮器20の下部28と管路25の下
部30に分離して溜まった冷凍機油は、上記のようにして
管路31及び32内をそれぞれ二段スクリュ圧縮機18の一段
目スクリュ圧縮機18a のとじ込み位置29a へと戻される
ので、アンモニア冷凍装置Ｂを停止させることなく冷凍
運転状態で溜まった冷凍機油を戻すことができ、アンモ
ニア冷凍装置Ｂの連続運転が可能で稼働率の向上が期待
できる。In the ammonia refrigerating apparatus B, the refrigerating machine oil separated and accumulated in the lower part 28 of the condenser 20 and the lower part 30 of the pipe 25 in the same manner as the ammonia refrigerating apparatus A is supplied to the pipes 31 and 32 as described above. Is returned to the binding position 29a of the first-stage screw compressor 18a of the two-stage screw compressor 18, so that the refrigerating machine oil accumulated in the refrigerating operation state can be returned without stopping the ammonia refrigeration apparatus B, and the ammonia can be returned. Continuous operation of the refrigeration system B is possible, and an improvement in the operation rate can be expected.
【００４０】なお、上記アンモニア冷凍装置Ｂの例で
は、分離した冷凍機油の戻し管路を凝縮器20の下部28と
管路25の下部30の二箇所に設けた例を説明したが、油の
溜まりやすいいずれか一箇所であってもよいし、図２に
二点鎖線で併せて図示するように、膨張弁21と蒸発器22
の間の管路26と蒸発器22と二段スクリュ圧縮機18の間の
管路27との間に、膨張弁21と蒸発器22の間の管路26の下
部（図では液溜まりとなる低い所を管断面で示す）33に
溜まる冷凍機油を戻す管路34を設け、この管路34を前記
凝縮器20の下部28と管路25の下部30の二箇所に設けた管
路31, 32と併せて又は単独で設けるように構成してもよ
い。このように管路34を設けても膨張弁21と蒸発器22の
間の管路26の下部33に溜まった冷凍機油をアンモニア冷
凍装置Ｂを停止させることなく冷凍運転状態で戻すこと
ができ、アンモニア冷凍装置Ｂの連続運転が可能で稼働
率の向上が期待できる。In the example of the ammonia refrigerating apparatus B, an example is described in which return pipes for the separated refrigerating machine oil are provided at two places, a lower part 28 of the condenser 20 and a lower part 30 of the pipe 25. It may be located at any one of the locations where it is likely to accumulate, or as shown in FIG.
Between the expansion valve 21 and the evaporator 22 between the evaporator 22 and the two-stage screw compressor 18 between the evaporator 22 and the evaporator 22. A pipe 34 is provided for returning the refrigerating machine oil accumulated in 33), and the pipe 34 is provided in two places, a lower part 28 of the condenser 20 and a lower part 30 of the pipe 25. It may be configured so as to be provided in combination with 32 or alone. Thus, even if the pipe 34 is provided, the refrigerating machine oil accumulated in the lower portion 33 of the pipe 26 between the expansion valve 21 and the evaporator 22 can be returned in the refrigeration operation state without stopping the ammonia refrigeration apparatus B, Continuous operation of the ammonia refrigeration system B is possible, and an improvement in the operation rate can be expected.
【００４１】また、上記アンモニア冷凍装置Ｂの例で
は、分離した冷凍機油の戻し管路を凝縮器20の下部28と
管路25の下部30の二箇所に設け、その管路31, 32をそれ
ぞれ二段スクリュ圧縮機18の一段目スクリュ圧縮機18a
のとじ込み位置29a に接続した例を説明したが、本発明
はこの例に限定されるものではなく、例えば図３に示す
ように、管路31, 32をそれぞれ二段スクリュ圧縮機18の
一段目スクリュ圧縮機18a と二段目スクリュ圧縮機18b
の間に接続してもよく、この位置に接続しても圧力差に
よって、アンモニア冷凍装置Ｂを停止させることなく冷
凍運転状態で溜まった冷凍機油を戻すことができ、アン
モニア冷凍装置Ｂの連続運転が可能で稼働率の向上が期
待できる。また、図４に示すように、管路31, 32をそれ
ぞれ二段スクリュ圧縮機18の二段目スクリュ圧縮機18b
のとじ込み位置29b に接続してもよく、このとじ込み位
置29b に接続しても圧力差によって、アンモニア冷凍装
置Ｂを停止させることなく冷凍運転状態で溜まった冷凍
機油を戻すことができ、アンモニア冷凍装置Ｂの連続運
転が可能で稼働率の向上が期待できる。In the example of the ammonia refrigerating apparatus B, return pipes for the separated refrigerating machine oil are provided at two places, a lower part 28 of the condenser 20 and a lower part 30 of the pipe 25, and the pipes 31, 32 are respectively provided. First-stage screw compressor 18a for two-stage screw compressor 18
Although an example was described in which the connection was made to the binding position 29a of the first embodiment, the present invention is not limited to this example. For example, as shown in FIG. Screw compressor 18a and second stage screw compressor 18b
The refrigeration oil accumulated in the refrigeration operation state can be returned without stopping the ammonia refrigeration apparatus B due to the pressure difference even when connected to this position. It is possible to improve the operation rate. As shown in FIG. 4, the pipes 31 and 32 are respectively connected to the second-stage screw compressor 18b of the two-stage screw compressor 18.
The refrigerating machine oil accumulated in the refrigerating operation state can be returned without stopping the ammonia refrigerating device B due to the pressure difference even when the refrigerating machine oil is connected to the rejecting position 29b. Continuous operation of B is possible, and an improvement in the operation rate can be expected.
【００４２】なお、上記図３及び図４に示すアンモニア
冷凍装置Ｂにおいても、二点鎖線で併せて図示するよう
に、膨張弁21と蒸発器22の間の管路26と蒸発器22と二段
スクリュ圧縮機18の間の管路27との間に、膨張弁21と蒸
発器22の間の管路26の下部（図では液溜まりとなる低い
所を管断面で示す）33に溜まる冷凍機油を戻す管路34を
設け、この管路34を前記凝縮器20の下部28と管路25の下
部30の二箇所に設けた管路31, 32と併せて又は単独で設
けるように構成してもよい。The ammonia refrigerating apparatus B shown in FIGS. 3 and 4 also has a pipe 26 between the expansion valve 21 and the evaporator 22, the evaporator 22 and the Refrigeration that accumulates in the lower part of the pipe 26 between the expansion valve 21 and the evaporator 22 (the lower part that becomes a liquid pool is shown by a pipe cross section) 33 between the pipe 27 between the stage screw compressor 18 and the pipe 27. A pipeline 34 for returning the machine oil is provided, and the pipeline 34 is configured so as to be provided together with or independently of the pipelines 31 and 32 provided at the lower portion 28 of the condenser 20 and the lower portion 30 of the pipeline 25. You may.
【００４３】図５は、本発明に係る別の実施形態のアン
モニア冷凍装置の模式図である。FIG. 5 is a schematic view of an ammonia refrigerating apparatus according to another embodiment of the present invention.
【００４４】この例のアンモニア冷凍装置Ｃは、上記例
のアンモニア冷凍装置ＡやＢにおける蒸発器５と22に代
えて直膨式蒸発器35を採用した外は基本的に同構成とす
るものである。そして、このような直膨式蒸発器35を採
用した場合には、上記アンモニア冷凍装置Ａ（Ｂ）にお
いて膨張弁４(21)と蒸発器５(22)の間の管路９(26)と蒸
発器５(22)とスクリュ圧縮機１(18)の間の管路10(27)と
の間に設けた、膨張弁４(21)と蒸発器４(22)の間の管路
９(26)の下部16(33)に溜まる冷凍機油を戻す管路17(34)
に代えて、直膨式蒸発器35内の管路36と直膨式蒸発器35
とスクリュ圧縮機１(18)の間の管路10(27)との間に、直
膨式蒸発器35内の管路36に溜まる冷凍機油を戻す管路37
を設けることができる。The ammonia refrigeration system C of this embodiment has basically the same configuration except that a direct expansion type evaporator 35 is employed in place of the evaporators 5 and 22 in the above-described ammonia refrigeration systems A and B. is there. When such a direct expansion type evaporator 35 is employed, the line 9 (26) between the expansion valve 4 (21) and the evaporator 5 (22) in the ammonia refrigeration system A (B) is provided. A pipe 9 () provided between the expansion valve 4 (21) and the evaporator 4 (22), provided between the evaporator 5 (22) and the pipe 10 (27) between the screw compressor 1 (18). Line 17 (34) for returning refrigeration oil accumulated in the lower part 16 (33) of 26)
Instead of the pipe 36 in the direct expansion type evaporator 35 and the direct expansion type
A pipe 37 for returning the refrigerating machine oil accumulated in a pipe 36 in the direct expansion type evaporator 35 between the pipe compressor 10 and a pipe 10 (27) between the screw compressor 1 (18).
Can be provided.
【００４５】[0045]
【発明の効果】以上説明したように、本発明に係るアン
モニア冷凍装置によれば、従来のアンモニア冷凍装置の
ように高圧受液器等の各機器の底部に油溜まりを設けた
り、更にその油溜まりの分離油を油受液器で回収するな
どの煩雑な油回収構成を採ることなく、凝縮器から膨張
弁に至る間の機器又は／及び管路に溜まった冷凍機油を
凝縮器から膨張弁に至る間の機器又は／及び管路と圧縮
機のとじ込み位置に、アンモニア冷凍装置を停止させる
ことなく冷凍運転状態で戻すことができ、アンモニア冷
凍装置の連続運転が可能で稼働率の向上が期待される。As described above, according to the ammonia refrigeration system according to the present invention, an oil reservoir is provided at the bottom of each device such as a high-pressure receiver as in the conventional ammonia refrigeration system, The refrigeration oil collected in the equipment or / and the pipeline between the condenser and the expansion valve is removed from the condenser and the expansion valve without employing a complicated oil recovery structure such as collecting the separated oil in the pool with an oil receiver. The ammonia refrigeration system can be returned to the stuck position of the equipment and / or pipeline and the compressor during the refrigeration operation without stopping the operation, and continuous operation of the ammonia refrigeration system is possible, which is expected to improve the operation rate. Is done.
【図１】本発明に係るアンモニア冷凍装置の模式図であ
る。FIG. 1 is a schematic diagram of an ammonia refrigeration apparatus according to the present invention.
【図２】本発明に係る別の実施形態のアンモニア冷凍装
置の模式図である。FIG. 2 is a schematic diagram of an ammonia refrigeration apparatus according to another embodiment of the present invention.
【図３】本発明に係る別の実施形態のアンモニア冷凍装
置の模式図である。FIG. 3 is a schematic view of an ammonia refrigeration apparatus according to another embodiment of the present invention.
【図４】本発明に係る別の実施形態のアンモニア冷凍装
置の模式図である。FIG. 4 is a schematic diagram of an ammonia refrigeration apparatus according to another embodiment of the present invention.
【図５】本発明に係る別の実施形態のアンモニア冷凍装
置の模式図である。FIG. 5 is a schematic diagram of an ammonia refrigeration apparatus according to another embodiment of the present invention.
【図６】従来のアンモニア冷凍装置の模式図である。FIG. 6 is a schematic diagram of a conventional ammonia refrigeration apparatus.
【図７】従来のアンモニア冷凍装置の模式図である。FIG. 7 is a schematic diagram of a conventional ammonia refrigeration apparatus.
１：単段スクリュ圧縮機 ２：油分離器
３：凝縮器 ４：膨張弁 ５：蒸発器 ６
〜10：管路 11：凝縮器の下部 12：とじ込み位置 1
3, 16：管路の下部 14, 15, 17：戻し管路 18：二段スクリュ圧縮機 18a ：一段目スクリュ圧縮機 18b ：二段目スクリュ圧縮機 19：油分離器 20：凝縮器 2
1：膨張弁 22：蒸発器 23〜27：管路 2
8：凝縮器の下部 29, 29a, 29b：とじ込み位置 30, 33：管路の下部 31, 32, 34：戻し管路 3
5：直膨式蒸発器 36：管路 37：戻し管路 Ａ，Ｂ，Ｃ：アンモニア冷凍装置1: Single-stage screw compressor 2: Oil separator
3: Condenser 4: Expansion valve 5: Evaporator 6
~ 10: Pipe line 11: Lower part of condenser 12: Binding position 1
3, 16: Lower part of pipeline 14, 15, 17: Return pipeline 18: Two-stage screw compressor 18a: First-stage screw compressor 18b: Second-stage screw compressor 19: Oil separator 20: Condenser 2
1: Expansion valve 22: Evaporator 23-27: Pipe line 2
8: Lower part of condenser 29, 29a, 29b: Binding position 30, 33: Lower part of pipeline 31, 32, 34: Return pipeline 3
5: Direct expansion type evaporator 36: Line 37: Return line A, B, C: Ammonia refrigeration unit
Claims (8)
発器をこの順に備え、アンモニアを冷媒として使用する
アンモニア冷凍装置において、凝縮器から膨張弁に至る
間の機器又は／及び管路と圧縮機のとじ込み位置との間
に、凝縮器から膨張弁に至る間の機器又は／及び管路に
溜まる冷凍機油を戻す管路が設けられてなることを特徴
とするアンモニア冷凍装置。1. An ammonia refrigerating apparatus comprising a compressor, an oil separator, a condenser, an expansion valve, and an evaporator in this order, and using ammonia as a refrigerant, a device or / and a pipe between the condenser and the expansion valve. An ammonia refrigerating apparatus characterized in that a line for returning refrigeration oil accumulated in a device or / and a line from a condenser to an expansion valve is provided between a passage and a binding position of a compressor.
おいて、圧縮機が二段圧縮機であって、冷凍機油を戻す
管路が一段目圧縮機のとじ込み位置に接続されてなるア
ンモニア冷凍装置。2. The ammonia refrigerating apparatus according to claim 1, wherein the compressor is a two-stage compressor, and a pipe for returning refrigerating machine oil is connected to a binding position of the first-stage compressor.
おいて、圧縮機が二段圧縮機であって、冷凍機油を戻す
管路が二段目圧縮機のとじ込み位置に接続されてなるア
ンモニア冷凍装置。3. The ammonia refrigerating apparatus according to claim 1, wherein the compressor is a two-stage compressor, and a pipe for returning refrigerating machine oil is connected to a binding position of the second-stage compressor. .
おいて、圧縮機が二段圧縮機であって、冷凍機油を戻す
管路が一段目圧縮機と二段目圧縮機の間に接続されてな
るアンモニア冷凍装置。4. The ammonia refrigerating apparatus according to claim 1, wherein the compressor is a two-stage compressor, and a pipe for returning refrigerating machine oil is connected between the first-stage compressor and the second-stage compressor. Ammonia refrigeration equipment.
発器をこの順に備え、アンモニアを冷媒として使用する
アンモニア冷凍装置において、膨張弁と蒸発器の間の管
路と蒸発器と圧縮機の間の管路との間に、膨張弁と蒸発
器の間の管路に溜まる冷凍機油を戻す管路が設けられて
なることを特徴とするアンモニア冷凍装置。5. An ammonia refrigerating apparatus comprising a compressor, an oil separator, a condenser, an expansion valve, and an evaporator in this order, and using ammonia as a refrigerant, comprises a pipe between the expansion valve and the evaporator, an evaporator, An ammonia refrigerating apparatus, wherein a pipe for returning refrigerating machine oil accumulated in a pipe between an expansion valve and an evaporator is provided between a pipe between compressors.
ニア冷凍装置において、膨張弁と蒸発器の間の管路と蒸
発器と圧縮機の間の管路との間に、膨張弁と蒸発器の間
の管路に溜まる冷凍機油を戻す管路が設けられてなるア
ンモニア冷凍装置。6. The ammonia refrigeration apparatus according to claim 1, wherein an expansion valve is provided between a pipe between the expansion valve and the evaporator and a pipe between the evaporator and the compressor. An ammonia refrigerating apparatus provided with a pipe for returning refrigerating machine oil accumulated in a pipe between evaporators.
発器をこの順に備え、アンモニアを冷媒として使用する
アンモニア冷凍装置において、蒸発器が直膨式蒸発器で
あって、その直膨式蒸発器の管路と蒸発器と圧縮機の間
の管路との間に、直膨式蒸発器の管路に溜まる冷凍機油
を戻す管路が設けられてなることを特徴とするアンモニ
ア冷凍装置。7. An ammonia refrigerating apparatus including a compressor, an oil separator, a condenser, an expansion valve, and an evaporator in this order, and using ammonia as a refrigerant, wherein the evaporator is a direct expansion evaporator, Ammonia, characterized in that a line for returning refrigeration oil accumulated in the line of the direct expansion type evaporator is provided between the line of the expansion type evaporator and the line between the evaporator and the compressor. Refrigeration equipment.
ニア冷凍装置において、蒸発器が直膨式蒸発器であっ
て、その直膨式蒸発器の管路と蒸発器と圧縮機の間の管
路との間に、直膨式蒸発器の管路に溜まる冷凍機油を戻
す管路が設けられてなることを特徴とするアンモニア冷
凍装置。8. The ammonia refrigerating apparatus according to claim 1, wherein the evaporator is a direct expansion type evaporator, and a pipe line of the direct expansion type evaporator, and between the evaporator and the compressor. An ammonia refrigeration apparatus, wherein a pipeline for returning refrigeration oil accumulated in the pipeline of the direct expansion type evaporator is provided between the ammonia refrigeration system and the pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000009049A JP2001201190A (en) | 2000-01-18 | 2000-01-18 | Ammonia refrigerating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000009049A JP2001201190A (en) | 2000-01-18 | 2000-01-18 | Ammonia refrigerating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001201190A true JP2001201190A (en) | 2001-07-27 |
Family
ID=18537245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000009049A Pending JP2001201190A (en) | 2000-01-18 | 2000-01-18 | Ammonia refrigerating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001201190A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007198670A (en) * | 2006-01-26 | 2007-08-09 | Sanden Corp | Refrigerating system and air conditioner for vehicle |
| JP2010014349A (en) * | 2008-07-03 | 2010-01-21 | Mayekawa Mfg Co Ltd | Refrigeration cycle and oil-cooled refrigerating machine |
| US8277207B2 (en) | 2005-06-29 | 2012-10-02 | Mayekawa Mfg. Co., Ltd. | Oil supply method of two-stage screw compressor, two-stage screw compressor applying the method, and method of operating refrigerating machine having the compressor |
| JP2012241910A (en) * | 2011-05-13 | 2012-12-10 | Mayekawa Mfg Co Ltd | Dry type evaporator, and method for improving cop of existing dry type evaporator |
| WO2023108856A1 (en) * | 2021-12-16 | 2023-06-22 | 福建雪人制冷设备有限公司 | Ammonia refrigeration compression, condensation and liquid storage unit |
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| JPS62276368A (en) * | 1986-05-23 | 1987-12-01 | 株式会社ボッシュオートモーティブ システム | Oil return mechanism in air conditioner |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8277207B2 (en) | 2005-06-29 | 2012-10-02 | Mayekawa Mfg. Co., Ltd. | Oil supply method of two-stage screw compressor, two-stage screw compressor applying the method, and method of operating refrigerating machine having the compressor |
| JP2007198670A (en) * | 2006-01-26 | 2007-08-09 | Sanden Corp | Refrigerating system and air conditioner for vehicle |
| JP2010014349A (en) * | 2008-07-03 | 2010-01-21 | Mayekawa Mfg Co Ltd | Refrigeration cycle and oil-cooled refrigerating machine |
| JP2012241910A (en) * | 2011-05-13 | 2012-12-10 | Mayekawa Mfg Co Ltd | Dry type evaporator, and method for improving cop of existing dry type evaporator |
| WO2023108856A1 (en) * | 2021-12-16 | 2023-06-22 | 福建雪人制冷设备有限公司 | Ammonia refrigeration compression, condensation and liquid storage unit |
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