JPS602535Y2 - Oil cooling system for turbo chiller - Google Patents

Description

【考案の詳細な説明】 本考案はターボ冷凍機の潤滑装置に係り、詳しくは蒸発
機内に潤滑油が停滞することによる油上りの解消ならび
に潤滑装置に不可欠の冷却システムの簡易化をはかり得
る如くした油冷却装置の構造に関する。[Detailed Description of the Invention] The present invention relates to a lubrication system for a centrifugal chiller, and more specifically, it aims to eliminate oil buildup caused by stagnation of lubricating oil in the evaporator and to simplify the cooling system essential to the lubrication system. The present invention relates to the structure of an oil cooling device.

ターボ冷凍機は電動圧縮機の各軸受部での発熱を防ぐた
めに潤滑油を強制的に給油する潤滑装置を装備させてい
るのが普通である。Centrifugal refrigerators are usually equipped with a lubrication device that forcibly supplies lubricating oil to prevent heat generation at each bearing of the electric compressor.

ところが従来のターボ冷凍機は第２図に示すように潤滑
油の温度上昇を抑えて安定した潤滑性能を発揮させる必
要から、潤滑装置の給油ラインに油冷却器２０を別置し
た構造であって、この油冷却器２０が可成り大形となり
設置スペースを占有するばかりでなく装置コストの上昇
を招く問題があった。However, as shown in Fig. 2, conventional centrifugal chillers have a structure in which an oil cooler 20 is installed separately in the oil supply line of the lubrication system because it is necessary to suppress the temperature rise of the lubricating oil and exhibit stable lubrication performance. However, this oil cooler 20 is quite large, which not only occupies installation space but also increases the cost of the device.

また、潤滑油ラインと冷媒ラインとは、一般に油タンク
１２と圧縮機の吸入側とが均圧管１４によって圧力均衡
がはかれているほかは互いに独立した系統をなしている
ので、冷凍運転中に潤滑油の一部が圧縮機部分で冷媒ラ
インに漏入すると、この漏入した油が蒸発器１０内に溜
って所謂油上り現象を呈し、返油されないことにより、
冷媒が汚染されて蒸発器の性能低下を招き、冷凍能力の
不足を来すなどの不都合があった。In addition, the lubricating oil line and the refrigerant line are generally independent systems, except that the oil tank 12 and the suction side of the compressor are pressure balanced by the pressure equalizing pipe 14. When some of the lubricating oil leaks into the refrigerant line at the compressor section, this leaked oil accumulates in the evaporator 10 and exhibits the so-called oil rising phenomenon, and the oil is not returned.
There were disadvantages such as contamination of the refrigerant, which led to a decline in the performance of the evaporator, resulting in a lack of refrigeration capacity.

本考案はか）る従来装置の問題点に着目して、考案され
たものであって、その目的とするところは、コスト増、
設置スペースの占有の原因である油冷却器を省略して効
率的な油冷却を可能とするとともに油上りによる冷媒汚
染の問題を解消し得る装置を提供する点にある。The present invention was devised by focusing on the problems of the conventional device, and its purpose is to reduce cost increase,
It is an object of the present invention to provide a device that enables efficient oil cooling by omitting an oil cooler that occupies installation space, and that can solve the problem of refrigerant contamination due to oil spillage.

しかして本考案は上記目的の遠戚のために、高圧冷媒ガ
スあるいは圧油を利用したエゼクタ−作用によって、低
圧冷媒液を油タンク内に送給し、その蒸発潜熱により潤
滑油を冷却しながら、しかも蒸発器内に滞溜している油
を潤滑系統に返戻し得る如くした構成を特徴とする。Therefore, the present invention is a distant relative of the above-mentioned object, and uses an ejector action using high-pressure refrigerant gas or pressure oil to feed low-pressure refrigerant liquid into an oil tank, cooling the lubricating oil with its latent heat of vaporization. Moreover, it is characterized by a structure in which oil accumulated in the evaporator can be returned to the lubrication system.

以下本考案装置例を添付図面によって説明する。An example of the device of the present invention will be explained below with reference to the accompanying drawings.

第１図において１は羽根車２、増速装置３、電動機４を
密閉ケーシング５内に収納した電動圧縮機であり、各軸
受６ａ〜６ｃによって回転部分が支持される。In FIG. 1, reference numeral 1 denotes an electric compressor in which an impeller 2, a speed increasing device 3, and an electric motor 4 are housed in a sealed casing 5, and rotating parts are supported by bearings 6a to 6c.

羽根車２の吸入側には入口弁７を備えたガイド部材８が
設けられ、このガイド部材８を介して羽根車２の吸入側
を蒸発器１０に連絡する一方、羽根車２の吐出側を凝縮
器９に連絡し、さらに凝縮器９と蒸発器１０とを、フロ
ート弁１１が内蔵された液溜室を介し連通せしめて公知
のターボ冷凍機が構成されている。A guide member 8 equipped with an inlet valve 7 is provided on the suction side of the impeller 2, and the suction side of the impeller 2 is connected to the evaporator 10 via the guide member 8, while the discharge side of the impeller 2 is connected to the evaporator 10. A known turbo refrigerator is constructed by communicating with the condenser 9 and further communicating the condenser 9 and the evaporator 10 via a liquid storage chamber in which a float valve 11 is built-in.

このターボ冷凍機には潤滑装置を付設して有するが、該
潤滑装置は油タンク１２、油ポンプ１３および均圧管１
４を要素となしており、油タンク１２は均圧管１４によ
って羽根車２の吸入側と連通させ低圧域に保持するとと
もに、返油管１５ａｔ１５ｂを介して電動圧縮機の密閉
ケーシング５内に連通し、かつ油ポンプ１３を介設した
送油管１６によって各軸受部６ａ〜６Ｃに連絡している
。This centrifugal refrigerator is equipped with a lubricating device, which includes an oil tank 12, an oil pump 13, and a pressure equalizing pipe 1.
The oil tank 12 communicates with the suction side of the impeller 2 through a pressure equalization pipe 14 to maintain it in a low pressure region, and communicates with the inside of the hermetic casing 5 of the electric compressor through an oil return pipe 15at15b. Moreover, it communicates with each bearing part 6a-6C by the oil feed pipe 16 in which the oil pump 13 was interposed.

以上の回路構成になる潤滑装置は油タンク１２内の潤滑
油を油ポンプ１３で吸上げて、送油管１６を経て密閉ケ
ーシング５内の各軸受部６ａ〜６Ｃに圧送し、潤滑の用
に供した後、返油管１５ａｉ５ｂを経て、油タンク１２
に返送し、この流通過程を繰り返させて円滑な潤滑が威
されるものである。The lubrication device having the circuit configuration described above sucks up the lubricating oil in the oil tank 12 with the oil pump 13, sends it under pressure to each of the bearings 6a to 6C in the sealed casing 5 through the oil feed pipe 16, and supplies it for lubrication. After that, the oil tank 12 is passed through the oil return pipe 15ai5b.
This distribution process is repeated to ensure smooth lubrication.

なお、油タンク１２は図示の別置構造の他に密閉ケーシ
ング５内の増速装置３を収納したギヤ室３ａに一体に設
けた構造のものであってもよい。The oil tank 12 may have a separate structure as shown in the drawings, or may have a structure integrated with the gear chamber 3a housing the speed increasing device 3 in the sealed casing 5.

この場合、前記均圧管１４は羽根車２の吸入側とギヤ室
３ａの上部とを連通ずるのである。In this case, the pressure equalizing pipe 14 communicates the suction side of the impeller 2 with the upper part of the gear chamber 3a.

また前記均圧管１４の途中にはオイルセパレータ（図示
せず）を介設し、分離した油を油タンク１２に戻すよう
にしてもよい。Further, an oil separator (not shown) may be interposed in the middle of the pressure equalizing pipe 14 and the separated oil may be returned to the oil tank 12.

上記ターボ冷凍機は以上述べた潤滑装置に加えて油冷却
装置を備えているが、該装置は図示の如く、蒸発器１０
の液相部を配管１７によって前記油タンク１２に連通し
、この配管１７の途中にエゼクタ−１８を介設した簡単
な構造であって、エゼクタ−１８は誘引ポートを蒸発器
１０側に吐出ポートを油タンク１２側に連絡した配置形
態をとっている。The above-mentioned centrifugal refrigerator is equipped with an oil cooling device in addition to the above-mentioned lubrication device, and as shown in the figure, this device includes an evaporator 10
It has a simple structure in which the liquid phase part of is connected to the oil tank 12 through a pipe 17, and an ejector 18 is interposed in the middle of this pipe 17. is connected to the oil tank 12 side.

上記エゼクタ−１８は上記両ボートの他に噴流体を吐出
ポートに向は噴出させるノズルを連絡した噴流ポートを
有する周知の構造であって、該噴流ポートは配管２０−
０を介して凝縮器９の気相部に連通させている。The ejector 18 has a well-known structure, in addition to the two boats, a jet port which connects a nozzle for jetting fluid to a discharge port, and the jet port is connected to the piping 20-
It is communicated with the gas phase part of the condenser 9 through 0.

図中、１９はフィルターを示している。In the figure, 19 indicates a filter.

次に上記構造になる油冷却装置の作動について述べると
、冷凍運転中において、凝縮器９内の高圧冷媒ガスの一
部が配管２０−１を介してエゼクタ−１８に送られ、ノ
ズルから噴出される。Next, the operation of the oil cooling system having the above structure will be described. During refrigeration operation, a part of the high-pressure refrigerant gas in the condenser 9 is sent to the ejector 18 via the pipe 20-1, and is ejected from the nozzle. Ru.

この噴出冷媒ガスのエゼクタ−作用によって蒸発器１０
内の液冷媒の一部が配管１７を通って油タンク１２に送
り込まれ、この低圧液冷媒は油タンク１２内で蒸発気化
する際に、潤滑油を冷却する。Due to the ejector action of this jetted refrigerant gas, the evaporator 10
A part of the liquid refrigerant inside is sent into the oil tank 12 through the pipe 17, and when this low-pressure liquid refrigerant evaporates in the oil tank 12, it cools the lubricating oil.

そして蒸発気化により生じた冷媒ガスは均圧管１４を経
て羽根車２に吸入され、従って冷凍サイクル系に返戻さ
れる。The refrigerant gas generated by evaporation is sucked into the impeller 2 through the pressure equalization pipe 14, and is therefore returned to the refrigeration cycle system.

このようにして、高圧冷媒ガスを噴流体としたエゼクタ
−１８によって低圧冷媒が油タンク１２に送り込まれる
結果、低圧冷媒との直接接触による熱交換作用で潤滑油
の冷却が効率よく行われるが、油上り現象によって蒸発
器１０内に溜っている潤滑油があると、この潤滑油は配
管１７によって油タンク１２に返されるため、油の滞溜
による冷媒の汚染などの問題は解決される。In this way, the low-pressure refrigerant is sent into the oil tank 12 by the ejector 18 which uses high-pressure refrigerant gas as a jet fluid, and as a result, the lubricating oil is efficiently cooled by the heat exchange effect caused by direct contact with the low-pressure refrigerant. If there is lubricating oil accumulated in the evaporator 10 due to the oil rising phenomenon, this lubricating oil is returned to the oil tank 12 through the pipe 17, so problems such as contamination of the refrigerant due to oil accumulation are solved.

以上述べた例はエゼクタ−１８の噴流体として冷媒ガス
を利用したものについて述べたが、本考案はか）る例の
他に第１図において破線示しているように、エゼクタ−
１８の噴流ポートを配管２０−２によって油ポンプ１３
吐出側に接続された送油管１６と連絡してなる構造とす
ることもまた可能であり、この場合には圧油がエゼクタ
−１８の噴流体として利用される点が前記例と異るのみ
で、低圧液冷媒による冷却作用は同じように行われるも
のである。The above-mentioned example uses refrigerant gas as the jet fluid of the ejector 18, but in addition to this example, the ejector 18, as shown by the broken line in FIG.
18 jet port is connected to oil pump 13 by piping 20-2.
It is also possible to have a structure in which it is connected to the oil feed pipe 16 connected to the discharge side, and in this case, the only difference from the above example is that the pressure oil is used as the jet fluid of the ejector 18. , the cooling effect by low-pressure liquid refrigerant is performed in the same way.

なお、高圧冷媒ガスを噴流体として利用した装置の場合
は、エゼクタ−１８に異物が詰ってたとえ逆流現象が生
じても冷媒ガスであるために蒸発器側での冷媒汚染の問
題は全くないのが特長である。In addition, in the case of a device that uses high-pressure refrigerant gas as a jet fluid, even if the ejector 18 is clogged with foreign matter and a backflow phenomenon occurs, there is no problem of refrigerant contamination on the evaporator side because it is refrigerant gas. is a feature.

一方、圧油を噴流体に利用した装置の場合は、吐出ガス
の場合のように吐出ガス自体を冷却することが不要であ
るために、低圧液冷媒の吸引量が相対的に少くて済む利
点を有する。On the other hand, in the case of equipment that uses pressurized oil as the jet fluid, there is no need to cool the discharged gas itself as in the case of discharged gas, so the advantage is that the suction amount of low-pressure liquid refrigerant is relatively small. has.

本考案油冷却装置は以上の説明によって明らかな如く、
電動圧縮機の吸入側と均圧せしめた油タンク１２の上部
とを均圧管１４で接続し、前記油タンク１２に貯溜する
潤滑油を前記電動圧縮機の各軸受部に対し強制循還的に
給油する潤滑装置を備えたターボ冷凍機において、蒸発
器１０の液相部を配管１７を介して前記油タンク１２に
連通し、凝縮器９の高圧冷媒ガスあるいは前記潤滑装置
の圧油を噴流体に用いてなるエゼクタ−１８を前記配管
１７の途中に介設して、蒸発器１０内の液冷媒を油タン
ク１２供給すると共に、前記油タンク１２内のガス冷媒
を前記均圧管１４を介して前記電動圧縮機１の吸入側に
導く如くしたから、直接々触による熱交換作用で効率の
良い冷却が威されると共に、大形構造の油冷却器を省略
することが可能となってターボ冷凍機のコンパクト化な
らびにコスト低減を果し得る経済的利点を有する。As is clear from the above description, the oil cooling device of the present invention has the following features:
The suction side of the electric compressor and the upper part of the pressure-equalized oil tank 12 are connected by a pressure equalization pipe 14, and the lubricating oil stored in the oil tank 12 is forcedly circulated to each bearing part of the electric compressor. In a centrifugal refrigerator equipped with a lubricating device for refueling, the liquid phase portion of the evaporator 10 is communicated with the oil tank 12 via a pipe 17, and high-pressure refrigerant gas from the condenser 9 or pressure oil from the lubricating device is jetted. An ejector 18 used for Since it is led to the suction side of the electric compressor 1, efficient cooling is achieved through direct heat exchange, and a large-sized oil cooler can be omitted, making it possible to improve turbo refrigeration. It has the economic advantage of making the machine more compact and reducing costs.

また、潤滑油が油上りを起して、蒸発器１０中に油が混
入することがあっても、この混入油は油タンク１２への
回収が可能となり、その結果、冷媒汚染の問題も解決さ
れて、本考案は正に一石二鳥の効果を奏する。Furthermore, even if the lubricating oil rises and gets mixed into the evaporator 10, this mixed oil can be collected into the oil tank 12, and as a result, the problem of refrigerant contamination is solved. Therefore, the present invention can truly kill two birds with one stone.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案装置の実施に係るターボ冷凍機の装置回
路図、第２図は従来のターボ冷凍機の装置回路図である
。FIG. 1 is a circuit diagram of a centrifugal chiller according to the present invention, and FIG. 2 is a circuit diagram of a conventional centrifugal chiller.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 電動圧縮機１の吸入側と油タンク１２の上部とを均圧管
１４で接続し、前記油タンク１２の下部に貯溜する潤滑
油を前記電動圧縮機１の各軸受部に対し強制循還的に給
油する潤滑装置を備えたターボ冷凍機において、蒸発器
１０の液相部を配管１７を介して前記油タンク１２に連
通し、凝縮器９の高圧冷媒ガスあるいは前記潤滑装置の
圧油を噴流体に用いてなるエゼクタ−１８を前記配管１
７の途中に介設して、蒸発器１０内の液冷媒を油タンク
１２に供給すると共に、前記油タンク１２内のガス冷媒
を前記均圧管１４を介して前記電動圧縮機１の吸入側に
導く如くしたことを特徴とするターボ冷凍機の油冷却装
置。The suction side of the electric compressor 1 and the upper part of the oil tank 12 are connected by a pressure equalizing pipe 14, and the lubricating oil stored in the lower part of the oil tank 12 is forcedly circulated to each bearing part of the electric compressor 1. In a centrifugal refrigerator equipped with a lubricating device for refueling, the liquid phase portion of the evaporator 10 is communicated with the oil tank 12 via a pipe 17, and high-pressure refrigerant gas from the condenser 9 or pressure oil from the lubricating device is jetted. The ejector 18 used for
7, to supply the liquid refrigerant in the evaporator 10 to the oil tank 12, and to supply the gas refrigerant in the oil tank 12 to the suction side of the electric compressor 1 via the pressure equalization pipe 14. An oil cooling device for a centrifugal chiller, characterized in that the oil cooling device is adapted to be guided.