JP2004332666A

JP2004332666A - Compression device

Info

Publication number: JP2004332666A
Application number: JP2003131841A
Authority: JP
Inventors: Masanao Ando; 昌尚安藤; Hidefumi Saito; 英文斎藤; Hiroshi Isaka; 弘猪坂
Original assignee: Shimadzu Corp
Current assignee: Shimadzu Corp
Priority date: 2003-05-09
Filing date: 2003-05-09
Publication date: 2004-11-25
Anticipated expiration: 2023-05-09
Also published as: JP4432360B2

Abstract

<P>PROBLEM TO BE SOLVED: To improve cooling efficiency of compressed gas and compression efficiency of a second compression part in a two stage compression device. <P>SOLUTION: Cooling water W is supplied to a back surface of a first impeller 1a. The cooling water W is scattered from an outer circumference end by centrifugal force generated by rotation of the first impeller 1a and is sprayed to the compressed gas. Since the compressed gas is directly cooled by injecting cooling water therein, cooling efficiency can be improved. Since the compressed air of which temperature is raised through the first compression part 1 enters a second compression part 2 after being cooled, compression efficiency of the second compression part can be improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、第１圧縮部と第２圧縮部とで気体を２段に圧縮する圧縮装置に関し、さらに詳しくは、圧縮気体の冷却効率および第２圧縮部での圧縮効率を向上することが出来る圧縮装置に関する。
【０００２】
【従来の技術】
従来、２段圧縮機の第１圧縮部と第２圧縮部の中間に中間冷却器を設置すると共に第２圧縮部の後に吐出冷却器を設置した圧縮装置が知られている（例えば、特許文献１参照。）。
他方、２段圧縮機の第１圧縮部に入る気体に冷却水を噴射すると共に第２圧縮部から吐出した気体に冷却水を噴射する圧縮装置が知られている（例えば、特許文献２参照。）。
【０００３】
【特許文献１】
特開平１１−２０１０９８号公報（図３）
【特許文献２】
特開２００１−１６５５１４号公報（図３）
【０００４】
【発明が解決しようとする課題】
中間冷却器および吐出冷却器を設置した上記従来の圧縮装置では、熱交換器の隔壁を介して圧縮気体を冷却する間接冷却を行っているが、間接冷却では冷却効率が悪い問題点がある。
他方、気体に冷却水を噴射する上記従来の圧縮装置では、直接冷却という点では冷却効率が良いが、第１圧縮部を経て高温（例えば１１０℃）となった圧縮気体を十分に混合してから冷却するという手段がないため、圧縮気体の一部は冷却されずに高温のまま第２圧縮部に入ることになり、第２圧縮部での圧縮効率が悪い問題点がある。
そこで、本発明の目的は、圧縮気体の冷却効率および第２圧縮部での圧縮効率を向上することが出来る圧縮装置を提供することにある。
【０００５】
【課題を解決するための手段】
第１の観点では、本発明は、気体を円周端から流出させ遠心方向と周方向の速度成分が含まれる回転流を形成する第１回転翼車と前記流出した気体を減速させ圧縮気体に変換する第１ディフューザと前記圧縮気体を集める第１スクロールからなる第１圧縮部と、気体を円周端から流出させ遠心方向と周方向の速度成分が含まれる回転流を形成する第２回転翼車と前記流出した気体を減速させ圧縮気体に変換する第２ディフューザと前記圧縮気体を集める第２スクロールからなる第２圧縮部と、前記第１圧縮部を出た圧縮気体を前記第２圧縮部に導くための連結流路と、前記第１回転翼車の外周端から前記第１スクロールの出口までの間の流路内で気体中に冷却水を噴霧する第１冷却水噴霧手段とを具備したことを特徴とする圧縮装置を提供する。
上記第１の観点による圧縮装置では、第１圧縮部を出た圧縮気体に冷却水を噴射して直接冷却するため、冷却効率を向上できる。このとき、第１回転翼車の外周端から第１スクロールの出口までの間の流路内で冷却水を噴霧するから、第１スクロールの出口で圧縮気体が集まるまでの過程で冷却水が気体に十分に混合し、この点でも冷却効率を向上できる。これに対して、気体に冷却水を噴射する上記従来の圧縮装置では、冷却水を噴射する位置から見て冷却水が気体に十分に混合されず、この点で冷却効率が悪い。
また、上記第１の観点による圧縮装置では、第１圧縮部を経て高温となった圧縮気体が冷却されてから第２圧縮部に入ることになるから、第２圧縮部での圧縮効率を向上することが出来る。
さらに、第２圧縮部に入る圧縮気体に水滴が残っていると、第２回転翼車の翼車の吸い込み部表面に水滴が付着し、翼車の入口側の前縁に付着した水滴は、ガス流に沿って翼の表面を流れ、ガス流が滞留するような箇所に溜まってしまい翼表面に長い時間付着し続けるので、第２回転翼車の回転アンバランスに起因する振動を引き起こす可能性があるが、上記第１の観点による圧縮装置では、第１スクロールの出口までの間の流路内で冷却水を噴霧し、連結流路内では冷却水を噴霧しないから、連結流路内を流れる間に圧縮気体から水滴が脱落し、第２圧縮部には回転に支障を与えるような水滴を含まない圧縮気体が入ることになり、水滴の付着による回転アンバランスに起因する第２回転翼車の振動を回避することも出来る。
【０００６】
第２の観点では、本発明は、上記構成の圧縮装置において、前記冷却水は、前記第１回転翼車の背面に供給され、前記第１回転翼車の回転による遠心力で微細化され気体中に飛散することを特徴とする圧縮装置を提供する。
上記第２の観点による圧縮装置では、第１回転翼車の回転を利用して冷却水を微細化し飛散するため、特別な噴射装置を必要とせずに、冷却水を圧縮気体に十分に混合することが出来る。また、第１回転翼車を冷却できる。
【０００７】
第３の観点では、本発明は、上記構成の圧縮装置において、前記第１回転翼車の回転軸が水軸受で支承され、前記水軸受に供給された水が前記第１回転翼車の背面に供給されることを特徴とする圧縮装置を提供する。
上記第３の観点による圧縮装置では、水軸受に対する水経路と圧縮気体に噴射する水経路とを統一することが出来るため、構成の小型化に好適となる。
【０００８】
第４の観点では、本発明は、上記構成の圧縮装置において、前記連結流路が、前記第１圧縮部を出た圧縮気体を旋回流とする旋回流形成構造と、前記旋回流を囲む周壁に付着した水滴を排出する排水構造と、前記周壁部分を経た旋回流を前記第２圧縮部に導く導出構造とを有することを特徴とする圧縮装置を提供する。
上記第４の観点による圧縮装置では、圧縮気体が連結流路内で旋回運動をすることで、旋回流を囲む周壁に水滴が遠心力により付着し、圧縮気体から水滴が十分に除去される。このため、第２圧縮部には水滴を含まない圧縮気体が入ることになり、水滴の付着による回転アンバランスに起因する第２回転翼車の振動を回避することが出来る。
【０００９】
第５の観点では、本発明は、上記構成の圧縮装置において、前記第２回転翼車の外周端から前記第２スクロールの出口までの間の流路内で気体中に冷却水を噴霧する第２冷却水噴霧手段を具備したことを特徴とする圧縮装置を提供する。
上記第５の観点による圧縮装置では、第２圧縮部を出た圧縮気体に冷却水を噴射して直接冷却するため、冷却効率を向上できる。このとき、第２回転翼車の外周端から第２スクロールの出口までの間の流路内で冷却水を噴霧するから、第２スクロールの出口で圧縮気体が集まるまでの過程で冷却水が気体に十分に混合し、この点でも冷却効率を向上できる。これに対して、気体に冷却水を噴射する上記従来の圧縮装置では、冷却水を噴射する位置から見て冷却水が気体に十分に混合されず、この点で冷却効率が悪い。
【００１０】
第６の観点では、本発明は、上記構成の圧縮装置において、前記冷却水は、前記第２回転翼車の背面に供給され、前記第２回転翼車の回転による遠心力で微細化され気体中に飛散することを特徴とする圧縮装置を提供する。
上記第６の観点による圧縮装置では、第２回転翼車の回転を利用して冷却水を微細化し飛散するため、特別な噴射装置を必要とせずに、冷却水を圧縮気体に十分に混合することが出来る。また、第２回転翼車を冷却できる。
【００１１】
第７の観点では、本発明は、上記構成の圧縮装置において、前記第２回転翼車の回転軸が水軸受で支承され、前記水軸受に供給された水が前記第２回転翼車の背面に供給されることを特徴とする圧縮装置を提供する。
上記第７の観点による圧縮装置では、水軸受に対する水経路と圧縮気体に噴射する水経路とを統一することが出来るため、構成の小型化に好適となる。
【００１２】
【発明の実施の形態】
以下、図に示す実施の形態により本発明を詳細に説明する。なお、これにより本発明が限定されるものではない。
【００１３】
図１は、本発明の一実施形態にかかる圧縮装置１００を示す一部破断正面図である。
この圧縮装置１００は、第１吸込口ＩＮ１から吸入した気体（例えば、水蒸気）を周方向に流出させる第１回転翼車１ａと流出した気体を減速させ圧縮気体に変換する第１ディフーザ１ｂと圧縮気体を集めて第１スクロール出口ＯＵＴ１から吐出する第１スクロール１ｃからなる第１圧縮部１と、第２吸込口ＩＮ２から吸入した気体を周方向に流出させる第２回転翼車２ａと流出した気体を減速させ圧縮気体に変換する第２ディフーザ２ｂと圧縮気体を集めて第２スクロール出口ＯＵＴ２から吐出する第２スクロール２ｃからなる第２圧縮部２と、第１圧縮部１を出た圧縮気体を第２圧縮部２に導くための連結流路３とを具備して構成される。なお、この図では連結流路の流路断面積を便宜上細く示しているが、実体は適切な流路面積が維持されているものとする。
【００１４】
第１回転翼車１ａおよび第２回転翼車２ａは、回転軸４の両端に取り付けられている。その回転軸４は、水軸受５で支承されている。また、回転軸４には、モータロータＲが一体的に構成されている。従って、モータステータＳに通電することで、モータロータＲが回転し、回転軸４が回転し、第１回転翼車１ａおよび第２回転翼車２ａが回転する。
【００１５】
モータステータＳの周囲には、水冷ジャケットＭｊが構成されている。
また、第１回転翼車１ａおよび第２回転翼車２ａの背面と水軸受５の間には、水軸封パッキン６が形成されている。
【００１６】
連結流路３は、第１圧縮部１の第１スクロール出口ＯＵＴ１に連結された配管３ａと、第２圧縮部２の第２吸入口ＩＮ２に連結された配管３ｂと、配管３ａと配管３ｂの間に設けられた除水部３１とを有している。
【００１７】
冷却水Ｗは、図示せぬ外部から水冷ジャケットＭｊに供給され、モータステータＳを冷却する。次に、水冷ジャケットＭｊから水軸受５に供給され、回転軸４を支承する。次に、水軸受５から水軸封パッキン６に供給され、回転軸４の端部と中央部とを気密にシールする。次に、水軸封パッキン６から第１回転翼車１ａおよび第２回転翼車２ａの背面へ漏れ、第１回転翼車１ａおよび第２回転翼車２ａを冷却する。
【００１８】
さらに、第１回転翼車１ａの背面へ漏れた冷却水Ｗは、第１回転翼車１ａの回転による遠心力で微細化されながら第１回転翼車１ａの外周端へ流れ、外周端から飛散され、第１ディフーザ１ｂおよび第１スクロール１ｃで圧縮気体と十分に混合し、第１圧縮部１で圧縮され高温（例えば１００℃〜２００℃）となった圧縮気体を冷却水Ｗの気化熱により冷却する。
【００１９】
他方、第２回転翼車２ａの背面へ漏れた冷却水Ｗは、第２回転翼車２ａの回転による遠心力で微細化されながら第２回転翼車２ａの外周端へ流れ、外周端から飛散され、第２ディフーザ２ｂおよび第２スクロール２ｃで圧縮気体と十分に混合し、第２圧縮部２で圧縮され高温（例えば１００℃〜２００℃）となった圧縮気体を冷却水Ｗの気化熱により冷却する。
【００２０】
図２は、連結流路３の除水部３１を示す上面図である。また、図３は、図２のＡ−Ａ’断面図である。
第１圧縮部１を出た圧縮気体は、配管３ａから除水部３１に入るが、除水部３１の周壁３１ａに対して偏心して入るため、周壁３１ａ内で旋回流ｃｙとなる。そして、旋回流ｃｙの中央から配管３ｂへ出て行く。
第１圧縮部１を出た圧縮気体には、冷却水Ｗの水滴が含まれるが、旋回流ｃｙの遠心力で周壁３１ａに水滴が付着し、圧縮気体から水滴が十分に除去される。このため、第２圧縮部２には水滴を含まない圧縮気体が入ることになり、第２回転翼車２ａへの水滴の付着による回転アンバランスに起因する第２回転翼車２ａの振動を回避することが出来る。
なお、周壁３１ａに付着した水滴は、除水部３１の底部の排水管３１ｂから排水ｗとして排出される。
【００２１】
以上の圧縮装置１００によれば次の効果が得られる。
（１）第１圧縮部１を出た圧縮気体に冷却水Ｗを噴射して直接冷却するため、冷却効率を向上できる。また、第１回転翼車１ａの外周端から第１スクロール出口ＯＵＴ１までの間の流路内で冷却水Ｗを噴霧するから、第１スクロール出口ＯＵＴ１で圧縮気体が集まるまでの過程で冷却水Ｗが気体に十分に混合し、この点でも冷却効率を向上できる。
（２）第１圧縮部１を経て高温となった圧縮気体が冷却されてから第２圧縮部２に入るから、第２圧縮部２での圧縮効率を向上することが出来る。
（３）第１回転翼車１ａの回転を利用して冷却水Ｗを微細化し飛散するため、特別な噴射装置を必要とせずに、冷却水Ｗを圧縮気体に十分に混合することが出来る。また、第１回転翼車１ａを冷却できる。
（４）第２圧縮部２に入る圧縮気体に水滴が残っていると、第２回転翼車２ａの表面に水滴が付着し、第２回転翼車２ａの回転アンバランスに起因する振動を引き起こす可能性があるが、連結流路３内では冷却水Ｗを噴霧せず、連結流路３の除水部３１で圧縮気体から水滴が十分に除去されるため、第２圧縮部２には水滴を含まない圧縮気体が入ることになり、水滴の付着による回転アンバランスに起因する第２回転翼車２ａの振動を回避することが出来る。
（５）第２圧縮部２を出た圧縮気体に冷却水Ｗを噴射して直接冷却するため、冷却効率を向上できる。また、第２回転翼車２ａの外周端から第２スクロール出口ＯＵＴ２までの間の流路内で冷却水Ｗを噴霧するから、第２スクロール出口ＯＵＴ２で圧縮気体が集まるまでの過程で冷却水Ｗが気体に十分に混合し、この点でも冷却効率を向上できる。
（６）第２回転翼車２ａの回転を利用して冷却水Ｗを微細化し飛散するため、特別な噴射装置を必要とせずに、冷却水Ｗを圧縮気体に十分に混合することが出来る。また、第２回転翼車２ａを冷却できる。
（７）モータステータＳを水冷する水経路と、水軸受５に対する水経路と、水軸封パッキン６に対する水経路と、圧縮気体に冷却水を噴射する水経路とを一系統にしているため、構成の小型化に好適となる。
【００２２】
−他の実施形態−
図４に示すような除水部３２を用いてもよい。
この除水部３２では、配管３ａにスクリュウ状のフィンＦを入れて、圧縮気体を旋回流ｃｙとし、周壁３２ａに遠心力で水滴を付着させ、旋回流ｃｙの中央から圧縮気体を配管３ｂへ出す。また、水滴は排水管３２ｂから排出する。
【００２３】
【発明の効果】
本発明の圧縮装置によれば、圧縮気体の冷却効率および第２圧縮部での圧縮効率を向上することが出来る。
【図面の簡単な説明】
【図１】本発明の一実施形態にかかる圧縮装置を示す一部破断正面図である。
【図２】除水部を示す上面図である。
【図３】図２のＡ−Ａ’断面図である。
【図４】除水部の他例を示す透視斜視図である。
【符号の説明】
１第１圧縮部
１ａ第１回転翼車
１ｂ第１ディフーザ
１ｃ第１スクロール
２第２圧縮部
２ａ第２回転翼車
２ｂ第２ディフーザ
２ｃ第２スクロール
３連結流路
３ａ，３ｂ配管
４回転軸
５水軸受
６水軸封パッキン
３１，３２除水部
３１ａ，３２ａ周壁
３１ｂ，３２ｂ排水管
１００圧縮装置[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a compression device that compresses a gas in two stages by a first compression unit and a second compression unit, and more specifically, can improve the cooling efficiency of the compressed gas and the compression efficiency in the second compression unit. It relates to a compression device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a compression apparatus in which an intercooler is installed between a first compression section and a second compression section of a two-stage compressor and a discharge cooler is installed after the second compression section (for example, Patent Document 1) 1).
On the other hand, a compression device that injects cooling water into gas entering a first compression unit of a two-stage compressor and injects cooling water into gas discharged from a second compression unit is known (for example, see Patent Document 2). ).
[0003]
[Patent Document 1]
JP-A-11-201098 (FIG. 3)
[Patent Document 2]
JP 2001-165514 A (FIG. 3)
[0004]
[Problems to be solved by the invention]
In the above-described conventional compression device provided with an intercooler and a discharge cooler, indirect cooling for cooling the compressed gas through the partition of the heat exchanger is performed. However, indirect cooling has a problem in that the cooling efficiency is poor.
On the other hand, in the above-described conventional compression device that injects cooling water into the gas, although the cooling efficiency is high in terms of direct cooling, the compressed gas that has become high temperature (for example, 110 ° C.) through the first compression section is sufficiently mixed. Since there is no means for cooling from the beginning, a part of the compressed gas enters the second compression section at a high temperature without being cooled, and there is a problem that the compression efficiency in the second compression section is poor.
Therefore, an object of the present invention is to provide a compression device that can improve the cooling efficiency of the compressed gas and the compression efficiency in the second compression section.
[0005]
[Means for Solving the Problems]
In a first aspect, the present invention provides a first impeller that forms a rotational flow that includes a centrifugal direction and a velocity component in a circumferential direction by causing gas to flow out from a circumferential end, and decelerates the outflowing gas to a compressed gas. A first compression section comprising a first diffuser for conversion and a first scroll for collecting the compressed gas, and a second rotary blade for causing the gas to flow out from a circumferential end to form a rotary flow including centrifugal and circumferential velocity components. A vehicle, a second diffuser comprising a second diffuser for decelerating the outflowing gas and converting the compressed gas into a compressed gas, and a second compressor comprising a second scroll for collecting the compressed gas; And a first cooling water spraying means for spraying cooling water into gas in a flow path from an outer peripheral end of the first rotary wheel to an outlet of the first scroll. To provide a compression device characterized by .
In the compression device according to the first aspect, the cooling gas is directly cooled by injecting the cooling water into the compressed gas that has exited the first compression section, so that cooling efficiency can be improved. At this time, since the cooling water is sprayed in the flow path from the outer peripheral end of the first rotary impeller to the outlet of the first scroll, the cooling water becomes gaseous in the process until the compressed gas collects at the outlet of the first scroll. In this respect, the cooling efficiency can be improved. On the other hand, in the conventional compression device that injects cooling water into the gas, the cooling water is not sufficiently mixed with the gas when viewed from the position where the cooling water is injected, and the cooling efficiency is poor in this respect.
Further, in the compression device according to the first aspect, since the compressed gas that has become high temperature through the first compression section is cooled and then enters the second compression section, the compression efficiency in the second compression section is improved. You can do it.
Further, if water droplets remain in the compressed gas entering the second compression unit, the water droplets adhere to the suction surface of the impeller of the second rotary impeller, and the water droplets adhere to the front edge on the inlet side of the impeller, The gas flows along the surface of the wing along the gas flow, accumulates in places where the gas flow stagnates, and continues to adhere to the wing surface for a long time, which may cause vibration due to the rotational imbalance of the second impeller. However, in the compression device according to the first aspect, the cooling water is sprayed in the flow path up to the outlet of the first scroll, and the cooling water is not sprayed in the connection flow path. Water drops drop from the compressed gas while flowing, and the compressed gas that does not contain water drops that impedes rotation enters into the second compression section, and the second rotor blade caused by rotation imbalance due to the adhesion of the water drops. It can also avoid car vibration.
[0006]
In a second aspect, the present invention provides the compression device having the above-described configuration, wherein the cooling water is supplied to a back surface of the first impeller, and is cooled by the centrifugal force generated by the rotation of the first impeller. A compression device characterized in that the compression device is scattered inside.
In the compression device according to the second aspect, the cooling water is finely dispersed and scattered by utilizing the rotation of the first impeller, so that the cooling water is sufficiently mixed with the compressed gas without requiring a special injection device. I can do it. Further, the first impeller can be cooled.
[0007]
According to a third aspect of the present invention, in the compression device having the above-described configuration, a rotation shaft of the first rotor is supported by a water bearing, and water supplied to the water bearing is provided on a back surface of the first rotor. And a compression device.
In the compression device according to the third aspect, the water path for the water bearing and the water path for injecting the compressed gas can be unified, which is suitable for downsizing the configuration.
[0008]
According to a fourth aspect of the present invention, in the compression device having the above-described configuration, the connection flow path includes a swirl flow forming structure that uses the compressed gas that has exited the first compression unit as a swirl flow, and a peripheral wall that surrounds the swirl flow. And a lead-out structure for guiding a swirling flow passing through the peripheral wall portion to the second compression section.
In the compression device according to the fourth aspect, since the compressed gas makes a swirling motion in the connection flow path, water droplets adhere to the peripheral wall surrounding the swirling flow by centrifugal force, and the water droplets are sufficiently removed from the compressed gas. For this reason, the compressed gas which does not contain water droplets enters the second compression portion, and vibration of the second rotor wheel caused by rotation imbalance due to adhesion of water droplets can be avoided.
[0009]
In a fifth aspect, the present invention provides the compression device having the above-described configuration, wherein the cooling water is sprayed into the gas in a flow path between an outer peripheral end of the second rotary impeller and an outlet of the second scroll. (2) A compression device provided with cooling water spraying means.
In the compression device according to the fifth aspect, since the cooling water is directly cooled by injecting the cooling water into the compressed gas that has exited the second compression section, the cooling efficiency can be improved. At this time, since the cooling water is sprayed in the flow path from the outer peripheral end of the second rotary impeller to the outlet of the second scroll, the cooling water becomes gaseous in the process until the compressed gas collects at the outlet of the second scroll. In this respect, the cooling efficiency can be improved. On the other hand, in the conventional compression device that injects cooling water into the gas, the cooling water is not sufficiently mixed with the gas when viewed from the position where the cooling water is injected, and the cooling efficiency is poor in this respect.
[0010]
According to a sixth aspect of the present invention, in the compression device having the above-described configuration, the cooling water is supplied to a back surface of the second impeller, and is cooled by the centrifugal force generated by the rotation of the second impeller. A compression device characterized in that the compression device is scattered inside.
In the compression device according to the sixth aspect, the cooling water is finely dispersed and scattered by utilizing the rotation of the second rotary impeller. Therefore, the cooling water is sufficiently mixed with the compressed gas without requiring a special injection device. I can do it. Further, the second impeller can be cooled.
[0011]
According to a seventh aspect of the present invention, in the compression device having the above-described configuration, a rotation shaft of the second rotary impeller is supported by a water bearing, and water supplied to the water bearing is provided on a back surface of the second rotary impeller. And a compression device.
In the compression device according to the seventh aspect, the water path for the water bearing and the water path for injecting the compressed gas can be unified, which is suitable for downsizing the configuration.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. Note that the present invention is not limited by this.
[0013]
FIG. 1 is a partially broken front view showing a compression device 100 according to an embodiment of the present invention.
The compression device 100 includes a first impeller 1a that allows gas (for example, water vapor) sucked in from the first suction port IN1 to flow out in the circumferential direction, a first diffuser 1b that decelerates the gas that has flowed out, and converts the gas into compressed gas. A first compressor 1 composed of a first scroll 1c that collects gas and discharges it from a first scroll outlet OUT1, a second rotary wheel 2a that discharges gas sucked from a second suction port IN2 in a circumferential direction, and gas that flows out The second compressor 2 is composed of a second diffuser 2b for decelerating the compressed gas into a compressed gas, a second scroll 2c for collecting the compressed gas and discharging it from a second scroll outlet OUT2, and a compressed gas exiting the first compressor 1. And a connection channel 3 for leading to the second compression section 2. In this figure, the cross-sectional area of the connecting flow path is shown thin for convenience, but it is assumed that an appropriate flow path area is maintained.
[0014]
The first impeller 1 a and the second impeller 2 a are attached to both ends of the rotating shaft 4. The rotating shaft 4 is supported by a water bearing 5. Further, a motor rotor R is integrally formed on the rotating shaft 4. Therefore, when the motor stator S is energized, the motor rotor R rotates, the rotating shaft 4 rotates, and the first rotating wheel 1a and the second rotating wheel 2a rotate.
[0015]
A water cooling jacket Mj is formed around the motor stator S.
Further, a water shaft sealing gasket 6 is formed between the back surfaces of the first rotating wheel 1 a and the second rotating wheel 2 a and the water bearing 5.
[0016]
The connection flow path 3 includes a pipe 3a connected to the first scroll outlet OUT1 of the first compression section 1, a pipe 3b connected to the second suction port IN2 of the second compression section 2, and a pipe 3a and a pipe 3b. And a water removing unit 31 provided therebetween.
[0017]
The cooling water W is supplied from outside (not shown) to the water cooling jacket Mj to cool the motor stator S. Next, the water is supplied from the water cooling jacket Mj to the water bearing 5 to support the rotating shaft 4. Next, the water is supplied from the water bearing 5 to the water shaft sealing gasket 6, and the end and the center of the rotary shaft 4 are hermetically sealed. Next, it leaks from the water seal 6 to the back surface of the first impeller 1a and the second impeller 2a, and cools the first impeller 1a and the second impeller 2a.
[0018]
Further, the cooling water W that has leaked to the back surface of the first impeller 1a flows to the outer peripheral end of the first impeller 1a while being miniaturized by centrifugal force caused by the rotation of the first impeller 1a, and scatters from the outer peripheral end. Then, the first diffuser 1b and the first scroll 1c sufficiently mix the compressed gas with the compressed gas, and the compressed gas which has been compressed by the first compression unit 1 and has become high temperature (for example, 100 ° C. to 200 ° C.) by the heat of vaporization of the cooling water W. Cooling.
[0019]
On the other hand, the cooling water W that has leaked to the back of the second impeller 2a flows to the outer peripheral end of the second impeller 2a while being miniaturized by centrifugal force due to the rotation of the second impeller 2a, and scatters from the outer peripheral end. The compressed gas is sufficiently mixed with the compressed gas by the second diffuser 2b and the second scroll 2c, and is compressed by the second compression unit 2 and becomes high temperature (for example, 100 ° C. to 200 ° C.) by the heat of vaporization of the cooling water W. Cooling.
[0020]
FIG. 2 is a top view showing the water removing section 31 of the connection flow path 3. FIG. 3 is a sectional view taken along line AA ′ of FIG.
The compressed gas that has exited the first compression unit 1 enters the water removal unit 31 from the pipe 3a, but enters the water removal unit 31 eccentrically with respect to the peripheral wall 31a, so that a swirling flow cy occurs in the peripheral wall 31a. And it goes out to the pipe 3b from the center of the swirling flow cy.
The compressed gas that has flowed out of the first compression unit 1 contains water droplets of the cooling water W. The water droplets adhere to the peripheral wall 31a due to the centrifugal force of the swirling flow cy, and the water droplets are sufficiently removed from the compressed gas. For this reason, the compressed gas which does not contain water droplets enters the second compression unit 2, thereby avoiding vibration of the second impeller 2 a due to rotational imbalance caused by the attachment of the water droplets to the second impeller 2 a. You can do it.
The water droplets adhering to the peripheral wall 31a are discharged as drainage w from a drain pipe 31b at the bottom of the water removing unit 31.
[0021]
According to the compression apparatus 100 described above, the following effects can be obtained.
(1) Since the cooling water W is injected into the compressed gas that has exited the first compression unit 1 and directly cooled, the cooling efficiency can be improved. Further, since the cooling water W is sprayed in the flow path from the outer peripheral end of the first rotary impeller 1a to the first scroll outlet OUT1, the cooling water W is generated in the process until the compressed gas is collected at the first scroll outlet OUT1. Is sufficiently mixed with the gas, and the cooling efficiency can be improved also in this respect.
(2) Since the compressed gas that has become high temperature through the first compression section 1 is cooled before entering the second compression section 2, the compression efficiency in the second compression section 2 can be improved.
(3) Since the cooling water W is miniaturized and scattered by utilizing the rotation of the first impeller 1a, the cooling water W can be sufficiently mixed with the compressed gas without requiring a special injection device. Further, the first impeller 1a can be cooled.
(4) If water droplets remain in the compressed gas entering the second compression unit 2, the water droplets adhere to the surface of the second impeller 2a, causing vibration due to rotational imbalance of the second impeller 2a. Although there is a possibility, the cooling water W is not sprayed in the connection flow path 3 and the water drops are sufficiently removed from the compressed gas in the water removal section 31 of the connection flow path 3. Compressed gas containing no water is introduced, and vibration of the second impeller 2a due to rotation imbalance due to the attachment of water droplets can be avoided.
(5) Cooling efficiency can be improved because the cooling water W is injected to the compressed gas that has exited the second compression section 2 to directly cool the compressed gas. Further, since the cooling water W is sprayed in the flow path between the outer peripheral end of the second rotary impeller 2a and the second scroll outlet OUT2, the cooling water W is collected in the process until the compressed gas is collected at the second scroll outlet OUT2. Is sufficiently mixed with the gas, and the cooling efficiency can be improved also in this respect.
(6) Since the cooling water W is miniaturized and scattered by utilizing the rotation of the second rotary impeller 2a, the cooling water W can be sufficiently mixed with the compressed gas without requiring a special injection device. Further, the second impeller 2a can be cooled.
(7) Since a water path for water-cooling the motor stator S, a water path for the water bearing 5, a water path for the water shaft seal 6, and a water path for injecting cooling water into the compressed gas are formed as one system. This is suitable for downsizing the configuration.
[0022]
-Other embodiments-
You may use the water removal part 32 as shown in FIG.
In the water removing section 32, screw-shaped fins F are inserted into the pipe 3a to make the compressed gas a swirling flow cy, and water droplets are attached to the peripheral wall 32a by centrifugal force. put out. The water drops are discharged from the drain pipe 32b.
[0023]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the compression apparatus of this invention, the cooling efficiency of a compressed gas and the compression efficiency in a 2nd compression part can be improved.
[Brief description of the drawings]
FIG. 1 is a partially broken front view showing a compression device according to an embodiment of the present invention.
FIG. 2 is a top view showing a water removing unit.
FIG. 3 is a sectional view taken along line AA ′ of FIG. 2;
FIG. 4 is a perspective view showing another example of the water removing unit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st compression part 1a 1st impeller 1b 1st diffuser 1c 1st scroll 2 2nd compression part 2a 2nd impeller 2b 2nd diffuser 2c 2nd scroll 3 Connecting channel 3a, 3b Piping 4 Rotating shaft 5 Water bearing 6 Water shaft seals 31, 32 Water removal parts 31a, 32a Peripheral walls 31b, 32b Drain pipe 100 Compressor

Claims

A first rotating wheel that causes a gas to flow out from a circumferential end to form a rotational flow including centrifugal and circumferential velocity components, a first diffuser that decelerates the outflowing gas and converts it to a compressed gas, and the compressed gas. A first compression section comprising a first scroll to be collected, a second impeller for discharging gas from a circumferential end to form a rotating flow including centrifugal and circumferential velocity components, and a deceleration and compression of the discharged gas. A second diffuser configured to convert the gas into a second diffuser and a second scroll that collects the compressed gas, a connection flow path for guiding the compressed gas that has exited the first compressed portion to the second compressed portion, A first cooling water spraying means for spraying cooling water into gas in a flow path from an outer peripheral end of the first rotary impeller to an outlet of the first scroll.

2. The compression device according to claim 1, wherein the cooling water is supplied to a back surface of the first impeller, is minuted by centrifugal force generated by rotation of the first impeller, and is scattered in gas. 3. Compression device.

3. The compression device according to claim 2, wherein a rotation shaft of the first impeller is supported by a water bearing, and water supplied to the water bearing is supplied to a back surface of the first impeller. Compression device.

4. The compression device according to claim 1, wherein the connection flow path has a swirl flow forming structure that uses the compressed gas that has exited the first compression section as a swirl flow, and a peripheral wall that surrounds the swirl flow. 5. A compression device comprising: a drainage structure for discharging water droplets adhered to a surface; and a lead-out structure for guiding a swirling flow passing through the peripheral wall portion to the second compression portion.

5. The compression device according to claim 1, wherein the cooling water is sprayed into the gas in a flow path between an outer peripheral end of the second rotary impeller and an outlet of the second scroll. 6. (2) A compression device comprising cooling water spraying means.

6. The compression device according to claim 5, wherein the cooling water is supplied to a back surface of the second impeller, and is micronized by centrifugal force due to rotation of the second impeller and scatters in gas. Compression device.

7. The compression device according to claim 6, wherein a rotating shaft of the second impeller is supported by a water bearing, and water supplied to the water bearing is supplied to a back surface of the second impeller. Compression device.