JP2009162129A - Screw compressor - Google Patents

Screw compressor Download PDF

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Publication number
JP2009162129A
JP2009162129A JP2008001176A JP2008001176A JP2009162129A JP 2009162129 A JP2009162129 A JP 2009162129A JP 2008001176 A JP2008001176 A JP 2008001176A JP 2008001176 A JP2008001176 A JP 2008001176A JP 2009162129 A JP2009162129 A JP 2009162129A
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Japan
Prior art keywords
rotor
lip seal
screw compressor
bearing
screw
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Pending
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JP2008001176A
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Japanese (ja)
Inventor
Seiji Yoshimura
省二 吉村
Akinori Tamura
彰規 田村
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Kobe Steel Ltd
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Kobe Steel Ltd
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Priority to JP2008001176A priority Critical patent/JP2009162129A/en
Priority to SG200808956-7A priority patent/SG154374A1/en
Priority to KR1020080135552A priority patent/KR20090076786A/en
Priority to CNA2009100016901A priority patent/CN101482115A/en
Publication of JP2009162129A publication Critical patent/JP2009162129A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/005—Axial sealings for working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0021—Systems for the equilibration of forces acting on the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/028—Means for improving or restricting lubricant flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F04C29/042—Heating; Cooling; Heat insulation by injecting a fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/22—Fluid gaseous, i.e. compressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/40—Electric motor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Of Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw compressor wherein the life of a lip seal is not shortened by dirt. <P>SOLUTION: The screw compressor 1 is arranged with the lip seals 13, 14 between a suction flow passage 5 sucking target gas into a rotor chamber 3 storing a screw rotor 4 fitting female and male threads, and a bearing 11 supporting a rotor shaft 7 on the suction side of the screw rotor 4. A clearance between a partitioning wall 10 between the suction flow passage 5 and the lip seal 15, and the rotor shaft 7 is 0.5 to 1.5 mm. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明はスクリュ圧縮機に関する   The present invention relates to a screw compressor.

例えば、特許文献１には、水冷式スクリュ圧縮機において、吸込側の軸受の潤滑油が吸込流路に流出しないように、軸受室内にリップシールを配設したスクリュ圧縮機が記載されている。このようなスクリュ圧縮機において、吸込流路と軸受室とを区切る隔壁とロータ軸との隙間は、リップシールが破損しても直ちに軸受用潤滑油が吸込流路に流出し、すぐに軸受が破損したりしないように、できるだけ小さく設定される。   For example, Patent Document 1 describes a screw compressor in which a lip seal is provided in a bearing chamber so that lubricating oil in a suction-side bearing does not flow out into a suction passage in a water-cooled screw compressor. In such a screw compressor, the gap between the partition wall separating the suction flow path and the bearing chamber and the rotor shaft causes the bearing lubricating oil to immediately flow out into the suction flow path even if the lip seal is broken, and the bearing immediately It is set as small as possible so as not to break.

通常、軸受室に対して吸込流路は陰圧（負圧）となるが、運転を停止した瞬間など、吸込流路の圧力が軸受室より高くなり、対象気体が軸受室に流れ込むことがある。このとき、対象気体がゴミを随伴し、リップシールと隔壁との間にゴミが入ってしまうことがある。隔壁とロータ軸との隙間が小さいので、一度入ったゴミは、そのまま滞留し、リップシールを傷つけて、リップシールの寿命を縮めることになる。   Normally, the suction flow path becomes negative pressure (negative pressure) with respect to the bearing chamber, but the pressure of the suction flow path becomes higher than the bearing chamber at the moment when operation is stopped, and the target gas may flow into the bearing chamber. . At this time, the target gas may be accompanied by dust, and dust may enter between the lip seal and the partition wall. Since the gap between the partition wall and the rotor shaft is small, dust that has entered once stays as it is, damages the lip seal, and shortens the life of the lip seal.

他にも、スクリュ圧縮機の組み立て時に、吸込流路と軸受室とを区切る隔壁とリップシールとの間にゴミが混入し、リップシールの寿命を縮める場合もあった。
特開２００７−１３２２４３号公報 In addition, when the screw compressor is assembled, dust may be mixed between the lip seal and the partition wall that separates the suction flow path and the bearing chamber, thereby shortening the life of the lip seal.
JP 2007-132243 A

前記問題点に鑑みて、本発明は、ゴミによってリップシールの寿命が短縮されないスクリュ圧縮機を提供することを課題とする。   In view of the above problems, an object of the present invention is to provide a screw compressor in which the life of a lip seal is not shortened by dust.

前記課題を解決するために、本発明によるスクリュ圧縮機の第１の態様は、雌雄咬合するスクリュロータを収容するロータ室に対象気体を吸い込むための吸込流路と、前記スクリュロータの吸込側のロータ軸を支持する軸受けとの間にリップシールを配設したスクリュ圧縮機において、前記吸込流路と前記リップシールとの間の隔壁と、前記ロータ軸との隙間を０．５ｍｍ以上とする。   In order to solve the above-mentioned problems, a first aspect of the screw compressor according to the present invention includes a suction flow path for sucking a target gas into a rotor chamber that houses a male and female screw rotor, and a suction side of the screw rotor. In a screw compressor in which a lip seal is disposed between a bearing that supports a rotor shaft, a gap between the suction passage and the lip seal and the rotor shaft is 0.5 mm or more.

この構成によれば、リップシールのロータ側の空間に侵入したゴミが、隔壁とロータ軸との隙間から排出されるので、リップシールが傷付かない。   According to this configuration, dust that has entered the space on the rotor side of the lip seal is discharged from the gap between the partition wall and the rotor shaft, so that the lip seal is not damaged.

また、本発明の第１の態様のスクリュ圧縮機において、前記隔壁と前記ロータ軸との隙間を１．５ｍｍ以下としてもよい。   In the screw compressor according to the first aspect of the present invention, the gap between the partition wall and the rotor shaft may be 1.5 mm or less.

隔壁とロータ軸との隙間は、１．５ｍｍより大きくてもゴミを排出する作用に違いがない。また、リップシールが破損したときのためには、隔壁とロータ軸との隙間を小さくする方が好ましい。   Even if the gap between the partition wall and the rotor shaft is larger than 1.5 mm, there is no difference in the action of discharging dust. In addition, it is preferable to reduce the gap between the partition wall and the rotor shaft when the lip seal is broken.

また、本発明によるスクリュ圧縮機の第２の態様は、雌雄咬合するスクリュロータを収容するロータ室に対象気体を吸い込むための吸込流路と、前記スクリュロータの吸込側のロータ軸を支持する軸受けとの間にリップシールを配設したスクリュ圧縮機において、前記吸込流路と前記リップシールとの間の隔壁と、前記ロータ軸との隙間を、前記リップシールの高さの１／１０以上とする。   A second aspect of the screw compressor according to the present invention includes a suction flow path for sucking a target gas into a rotor chamber that houses a screw rotor that engages a male and female, and a bearing that supports a rotor shaft on the suction side of the screw rotor. In the screw compressor in which the lip seal is disposed between the suction passage and the lip seal, the gap between the suction passage and the rotor shaft is set to be 1/10 or more of the height of the lip seal. To do.

この構成によれば、リップシールのロータ側の空間に侵入したゴミが、隔壁とロータ軸との隙間から排出されるので、リップシールが傷付かない。   According to this configuration, dust that has entered the space on the rotor side of the lip seal is discharged from the gap between the partition wall and the rotor shaft, so that the lip seal is not damaged.

また、本発明の第２の態様のスクリュ圧縮機において、前記隔壁と前記ロータ軸との隙間を、前記リップシールの高さの３／１０以下としてもよい。   Moreover, the screw compressor of the 2nd aspect of this invention WHEREIN: It is good also considering the clearance gap between the said partition and the said rotor shaft as 3/10 or less of the height of the said lip seal.

隔壁とロータ軸との隙間は、リップシールの高さの３／１０より大きくてもゴミを排出する作用に違いがない。また、リップシールが破損したときのためには、隔壁とロータ軸との隙間を小さくする方が好ましい。   Even if the gap between the partition wall and the rotor shaft is larger than 3/10 of the height of the lip seal, there is no difference in the action of discharging dust. In addition, it is preferable to reduce the gap between the partition wall and the rotor shaft when the lip seal is broken.

また、本発明の第１の態様および第２の態様のスクリュ圧縮機において、前記リップシールと前記隔壁との間に潤滑流体を導入する潤滑空間を形成し、前記潤滑空間に潤滑流体を導入するための潤滑流路を設けてもよい。   Further, in the screw compressor according to the first and second aspects of the present invention, a lubricating space for introducing a lubricating fluid is formed between the lip seal and the partition wall, and the lubricating fluid is introduced into the lubricating space. A lubricating flow path may be provided.

この構成によれば、潤滑流体が潤滑空間に吸込流路からゴミが侵入することを防止し、万一潤滑空間にゴミが侵入しても、潤滑流体がゴミを吸込流路に排出するので、ゴミによってリップシールが損傷しない。   According to this configuration, the lubricating fluid prevents dust from entering the lubrication space from the suction flow path, and even if dust enters the lubrication space, the lubricating fluid discharges the dust to the suction flow path. Dust does not damage the lip seal.

本発明は、特に、軸受を潤滑油で潤滑し、ロータ室を水で潤滑する水冷式スクリュ圧縮機において、軸受用潤滑油の流出を防ぐリップシールの寿命短縮を防止できる。   The present invention can prevent the shortening of the life of the lip seal that prevents the bearing lubricating oil from flowing out, particularly in a water-cooled screw compressor that lubricates the bearing with lubricating oil and lubricates the rotor chamber with water.

本発明によれば、軸受を吸込流路から隔離するリップシールの周囲にゴミが侵入しても、吸込流路に排出できるので、リップシールの寿命を縮めない。   According to the present invention, even if dust enters the periphery of the lip seal that isolates the bearing from the suction flow path, it can be discharged to the suction flow path, so that the life of the lip seal is not shortened.

これより、本発明の実施形態について、図面を参照しながら説明する。
図１は、本発明の第１実施形態のスクリュ圧縮機１を示す。スクリュ圧縮機１は、ハウジング２のロータ室３内に収容された雌雄咬合する一対のスクリュロータ４で、対象気体（例えば、空気や冷媒など）を圧縮するオイルフリースクリュ圧縮機である。 Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 shows a screw compressor 1 according to a first embodiment of the present invention. The screw compressor 1 is an oil-free screw compressor that compresses a target gas (for example, air or a refrigerant) by a pair of male and female screw rotors 4 housed in a rotor chamber 3 of a housing 2.

ハウジング２には、ロータ室３に圧縮すべき対象気体を供給する吸込流路５と、ロータ室３内でスクリュロータ４によって圧縮された対象気体を排出する吐出流路６と、スクリュロータ４のロータ軸７を吸込側および吐出側で、それぞれ、支持および軸封する構造を設置するための軸受軸封室８，９が設けられている。吸込流路５と吸込側の軸受軸封室８とは、ロータ軸７が貫通する開口が形成された隔壁１０によって区分されている。   The housing 2 includes a suction flow path 5 for supplying a target gas to be compressed to the rotor chamber 3, a discharge flow path 6 for discharging the target gas compressed by the screw rotor 4 in the rotor chamber 3, and the screw rotor 4. Bearing shaft sealing chambers 8 and 9 are provided for installing a structure for supporting and sealing the rotor shaft 7 on the suction side and the discharge side, respectively. The suction flow path 5 and the suction-side bearing shaft sealing chamber 8 are divided by a partition wall 10 in which an opening through which the rotor shaft 7 passes is formed.

なお、このスクリュ圧縮機１は、ロータ室３内の潤滑および冷却のために図示しない水供給路から吸込流路５を介して対象気体とともに、ロータ室３に冷却水が供給されるように構成された水冷式圧縮機である。   The screw compressor 1 is configured so that cooling water is supplied to the rotor chamber 3 together with the target gas from a water supply passage (not shown) via a suction passage 5 for lubrication and cooling in the rotor chamber 3. This is a water-cooled compressor.

ロータ軸７は、吸込側の軸受軸封室８内に設置されたころ軸受１１と、吐出側の軸受軸封室９内に設置された２つの玉軸受１２とで回転可能に支持され、吸込側の軸受軸封室９を貫通してハウジング２の外部までさらに延伸し、不図示のモータに接続される。   The rotor shaft 7 is rotatably supported by a roller bearing 11 installed in the bearing shaft sealing chamber 8 on the suction side and two ball bearings 12 installed in the bearing shaft sealing chamber 9 on the discharge side. The bearing shaft sealing chamber 9 on the side is further extended to the outside of the housing 2 and connected to a motor (not shown).

ころ軸受１１の前記モータ側には、モータ側への異物（ころ軸受１１の潤滑油またはグリス）の浸入を防ぐリップシール１３が設置され、ころ軸受１１のスクリュロータ４側には、ころ軸受１１の潤滑油がスクリュロータ４側に流出しないように封止するリップシール１４と、吸込流路５からころ軸受１１側に冷却水が浸入しないように封止するリップシール１５とが設けられている。   A lip seal 13 is installed on the motor side of the roller bearing 11 to prevent foreign matter (lubricating oil or grease from the roller bearing 11) from entering the motor side. The roller bearing 11 has a roller bearing 11 on the screw rotor 4 side. A lip seal 14 that seals the lubricating oil from flowing out to the screw rotor 4 side and a lip seal 15 that seals cooling water from entering the roller bearing 11 side from the suction flow path 5 are provided. .

スクリュロータ４と玉軸受１２との間の吐出側の軸受軸封室９には、スクリュロータ４側から順に、メカニカルシール１６、リップシール１７，１８が設けられている。メカニカルシール１６は、軸受軸封室９の内壁に嵌合して固定されたステータと、ロータ軸７に嵌合してロータ軸７とともに回転し、ステータと気密に接触するロータとからなる公知のシール装置である。リップシール１７は、メカニカルシール１６側からの冷却水の浸入を封止する向きに設置され、リップシール１８は、玉軸受１２からの潤滑油やグリスなどの流出を防止する向きに設置されている。   In the bearing shaft sealing chamber 9 on the discharge side between the screw rotor 4 and the ball bearing 12, a mechanical seal 16 and lip seals 17 and 18 are provided in this order from the screw rotor 4 side. The mechanical seal 16 includes a stator that is fitted and fixed to the inner wall of the bearing shaft sealing chamber 9, and a known rotor that is fitted to the rotor shaft 7 and rotates together with the rotor shaft 7 so as to be in airtight contact with the stator. It is a sealing device. The lip seal 17 is installed in a direction that seals intrusion of cooling water from the mechanical seal 16 side, and the lip seal 18 is installed in a direction that prevents outflow of lubricating oil or grease from the ball bearing 12. .

また、ハウジング２には、リップシール１４とリップシール１５との間の軸受軸封室８を外部に連通させる開放流路１９と、メカニカルシール１６とリップシール１７との間の軸受軸封室９を吸込流路５と連通させる減圧流路２０とが設けられている。   Further, in the housing 2, an open channel 19 for communicating the bearing shaft sealing chamber 8 between the lip seal 14 and the lip seal 15 to the outside, and a bearing shaft sealing chamber 9 between the mechanical seal 16 and the lip seal 17 are provided. And a decompression flow path 20 for communicating with the suction flow path 5.

図２に、スクリュ圧縮機１において、ロータ軸７と隔壁１０との隙間δと、リップシールの公称寿命である５０００時間の運転の後のリップシール１５の摩耗量との関係を示す。なお、ロータ軸７と隔壁１０との隙間δを０．５ｍｍより小さくしたときは、５０００時間が経過する前に、リップシール１５が破損した。   FIG. 2 shows a relationship between the clearance δ between the rotor shaft 7 and the partition wall 10 in the screw compressor 1 and the amount of wear of the lip seal 15 after 5000 hours of operation, which is the nominal life of the lip seal. When the gap δ between the rotor shaft 7 and the partition wall 10 was made smaller than 0.5 mm, the lip seal 15 was broken before 5000 hours passed.

図示するように、ロータ軸７と隔壁１０との隙間δを、０．５ｍｍ以上とすることで、必要なリップシール１５の寿命を確保することができる。これは、ロータ軸７と隔壁１０との隙間δを大きくすることで、隙間δから軸受軸封室８に侵入したゴミが、隙間δから吸込流路５に排出され、リップシール１５を傷つけ難くなることによる。なお、この実験におけるリップシール１５の高さは５ｍｍであり、リップシール１５の高さを基準にすると、ロータ軸７と隔壁１０との隙間δは、リップシール１５の高さの１／１０以上とする必要がある。   As shown in the figure, the required life of the lip seal 15 can be ensured by setting the gap δ between the rotor shaft 7 and the partition wall 10 to 0.5 mm or more. This is because by increasing the gap δ between the rotor shaft 7 and the partition wall 10, dust that has entered the bearing shaft sealing chamber 8 from the gap δ is discharged from the gap δ into the suction flow path 5 and is difficult to damage the lip seal 15. By becoming. In this experiment, the height of the lip seal 15 is 5 mm, and the gap δ between the rotor shaft 7 and the partition wall 10 is 1/10 or more of the height of the lip seal 15 based on the height of the lip seal 15. It is necessary to.

さらに、ロータ軸７と隔壁１０との隙間δを大きくすると、ゴミに起因するリップシール１５の摩耗がより少なくなる。安全率を考慮すると、ロータ軸７と隔壁１０との隙間δは、１．０ｍｍ（リップシール１５の高さの２／１０）以上とすることが望ましい。   Further, when the gap δ between the rotor shaft 7 and the partition wall 10 is increased, the wear of the lip seal 15 due to dust is further reduced. Considering the safety factor, the gap δ between the rotor shaft 7 and the partition wall 10 is desirably 1.0 mm (2/10 of the height of the lip seal 15) or more.

しかしながら、隙間δが１．５ｍｍ（リップシール１５の高さの３／１０）を超えると、摩耗低減の効果に違いがない。万一、リップシール１３，１４が破損したときにも、ころ軸受１１の潤滑油の流出を低減するために、ロータ軸７と隔壁１０との隙間δはできるだけ小さい方がよいので、隙間δは、１．５ｍｍ（リップシール１５の高さの３／１０）以下にするべきである。   However, if the gap δ exceeds 1.5 mm (3/10 of the height of the lip seal 15), there is no difference in the effect of reducing wear. Even if the lip seals 13 and 14 are broken, the gap δ between the rotor shaft 7 and the partition wall 10 should be as small as possible in order to reduce the outflow of lubricating oil from the roller bearing 11. , 1.5 mm (3/10 of the height of the lip seal 15) or less.

さらに、図３に、本発明の第２実施形態のスクリュ圧縮機１ａを示す。以降の説明において、先に説明したものと同じ構成要素には同じ符号を付して、重複する記載を省略する。スクリュ圧縮機１ａは、第１実施形態のスクリュ圧縮機１と同様に、ロータ室３を冷却水で潤滑および冷却する水冷式スクリュ圧縮機である。   FIG. 3 shows a screw compressor 1a according to the second embodiment of the present invention. In the following description, the same components as those described above are denoted by the same reference numerals, and redundant descriptions are omitted. The screw compressor 1a is a water-cooled screw compressor that lubricates and cools the rotor chamber 3 with cooling water, similarly to the screw compressor 1 of the first embodiment.

スクリュ圧縮機１ａにおいて、リップシール１５のさらにロータ室３側に、隔壁１０との間に潤滑空間２１が形成されるようになっている。さらに、ハウジング２には、潤滑空間２１に冷却水（潤滑流体）を供給するための潤滑流路２２が形成されている。また、スクリュ圧縮機１ａの吐出側の軸受軸封室９には、ロータとステータとの隙間を冷却水で封止して軸封する非接触のラビリンスシール１６ａが配設されている。   In the screw compressor 1a, a lubricating space 21 is formed between the lip seal 15 and the partition wall 10 on the rotor chamber 3 side. Furthermore, a lubrication flow path 22 for supplying cooling water (lubricating fluid) to the lubrication space 21 is formed in the housing 2. The bearing shaft sealing chamber 9 on the discharge side of the screw compressor 1a is provided with a non-contact labyrinth seal 16a that seals the gap between the rotor and the stator with cooling water.

スクリュ圧縮機１ａは吐出流路６から吐出される圧縮された対象気体を気液分離器２３に導入し、冷却水を分離してから消費設備（不図示）に供給する。また、気液分離器２３で分離された冷却水は、フィルタ２４によって異物を除去され、潤滑流路２２を介して、潤滑空間２１に導入される。潤滑空間２１に導入された冷却水は、ロータ軸７と隔壁１０との隙間から吸込流路に流出し、対象気体とともにロータ室３に吸入され、ロータ室３とスクリュロータ４とを潤滑および冷却する。   The screw compressor 1a introduces the compressed target gas discharged from the discharge flow path 6 into the gas-liquid separator 23, separates the cooling water, and supplies it to a consumption facility (not shown). Further, the cooling water separated by the gas-liquid separator 23 is removed of foreign matters by the filter 24 and introduced into the lubricating space 21 via the lubricating flow path 22. The cooling water introduced into the lubrication space 21 flows out into the suction flow path through the gap between the rotor shaft 7 and the partition wall 10 and is sucked into the rotor chamber 3 together with the target gas, thereby lubricating and cooling the rotor chamber 3 and the screw rotor 4. To do.

本実施形態では、潤滑空間２１に冷却水が供給されるので、吸込流路５からゴミが軸受軸封室８に侵入しない。これにより、リップシール１５の異常な摩耗を防止でき、リップシール１５の寿命が短くならない。   In the present embodiment, since the cooling water is supplied to the lubrication space 21, dust does not enter the bearing shaft sealing chamber 8 from the suction flow path 5. Thereby, abnormal wear of the lip seal 15 can be prevented, and the life of the lip seal 15 is not shortened.

さらに、図４に、本発明の第３実施形態のスクリュ圧縮機１ｂを示す。スクリュ圧縮機１ｂは、第２実施形態と同様の水冷式スクリュ圧縮機であるが、ロータ軸７と隔壁１０との隙間が、従来のスクリュ圧縮機と同様に小さい。このため、潤滑空間２１から吸込流路へ漏出する冷却水の量が少なく、冷却水は、主として、ロータ室３に直接供給されるようになっている。本実施形態では、潤滑空間２１の圧力上昇を防止するために、潤滑流路２２に供給される冷却水の流量および圧力を制限するレギュレータ等を設けることが望ましい。   FIG. 4 shows a screw compressor 1b according to a third embodiment of the present invention. The screw compressor 1b is a water-cooled screw compressor similar to that of the second embodiment, but the gap between the rotor shaft 7 and the partition wall 10 is small as in the conventional screw compressor. For this reason, the amount of cooling water leaking from the lubricating space 21 to the suction flow path is small, and the cooling water is mainly supplied directly to the rotor chamber 3. In the present embodiment, it is desirable to provide a regulator or the like for limiting the flow rate and pressure of the cooling water supplied to the lubrication flow path 22 in order to prevent the pressure in the lubrication space 21 from increasing.

本発明の第１実施形態のスクリュ圧縮機。The screw compressor of 1st Embodiment of this invention. 隔壁とロータ軸との隙間の大きさとリップシールの摩耗との関係を示すグラフ。The graph which shows the relationship between the magnitude | size of the clearance gap between a partition and a rotor shaft, and abrasion of a lip seal. 本発明の第２実施形態のスクリュ圧縮機。The screw compressor of 2nd Embodiment of this invention. 本発明の第３実施形態のスクリュ圧縮機。The screw compressor of 3rd Embodiment of this invention.

符号の説明Explanation of symbols

１，１ａ，１ｂ…スクリュ圧縮機
２…ハウジング
３…ロータ室
４…スクリュロータ
５…吸込流路
８…軸受軸封室
１０…隔壁
１１…ころ軸受
１４…リップシール
１５…リップシール
２１…潤滑空間
２２…潤滑流路
２３…気液分離器
２４…フィルタ DESCRIPTION OF SYMBOLS 1,1a, 1b ... Screw compressor 2 ... Housing 3 ... Rotor chamber 4 ... Screw rotor 5 ... Suction flow path 8 ... Bearing shaft sealing chamber 10 ... Partition 11 ... Roller bearing 14 ... Lip seal 15 ... Lip seal 21 ... Lubrication space 22 ... Lubrication channel 23 ... Gas-liquid separator 24 ... Filter

Claims (8)

雌雄咬合するスクリュロータを収容するロータ室に対象気体を吸い込むための吸込流路と、前記スクリュロータの吸込側のロータ軸を支持する軸受けとの間にリップシールを配設したスクリュ圧縮機において、
前記吸込流路と前記リップシールとの間の隔壁と、前記ロータ軸との隙間を０．５ｍｍ以上としたことを特徴とするスクリュ圧縮機。 In a screw compressor in which a lip seal is disposed between a suction passage for sucking a target gas into a rotor chamber that houses a male and female screw rotor and a bearing that supports a rotor shaft on the suction side of the screw rotor,
A screw compressor characterized in that a gap between a partition wall between the suction passage and the lip seal and the rotor shaft is 0.5 mm or more. 前記隔壁と前記ロータ軸との隙間を１．５ｍｍ以下としたことを特徴とする請求項１に記載のスクリュ圧縮機。   The screw compressor according to claim 1, wherein a gap between the partition wall and the rotor shaft is 1.5 mm or less. 雌雄咬合するスクリュロータを収容するロータ室に対象気体を吸い込むための吸込流路と、前記スクリュロータの吸込側のロータ軸を支持する軸受けとの間にリップシールを配設したスクリュ圧縮機において、
前記吸込流路と前記リップシールとの間の隔壁と、前記ロータ軸との隙間を、前記リップシールの高さの１／１０以上としたことを特徴とするスクリュ圧縮機。 In a screw compressor in which a lip seal is disposed between a suction passage for sucking a target gas into a rotor chamber that houses a male and female screw rotor and a bearing that supports a rotor shaft on the suction side of the screw rotor,
A screw compressor characterized in that a gap between a partition wall between the suction passage and the lip seal and the rotor shaft is 1/10 or more of a height of the lip seal. 前記隔壁と前記ロータ軸との隙間を、前記リップシールの高さの３／１０以下としたことを特徴とする請求項３に記載のスクリュ圧縮機。   The screw compressor according to claim 3, wherein a gap between the partition wall and the rotor shaft is 3/10 or less of a height of the lip seal. 前記リップシールと前記隔壁との間に潤滑流体を導入する潤滑空間を形成し、
前記潤滑空間に潤滑流体を導入するための潤滑流路を設けたことを特徴とする請求項１から４のいずれかに記載のスクリュ圧縮機。 Forming a lubricating space for introducing a lubricating fluid between the lip seal and the partition;
The screw compressor according to any one of claims 1 to 4, further comprising a lubricating flow path for introducing a lubricating fluid into the lubricating space. 前記潤滑流体が水であることを特徴とする請求項５に記載のスクリュ圧縮機。   The screw compressor according to claim 5, wherein the lubricating fluid is water. 雌雄咬合するスクリュロータを収容するロータ室に対象気体を吸い込むための吸込流路と、前記スクリュロータの吸込側のロータ軸を支持する軸受けを保持する軸受室とが、前記ロータ軸が貫通する隔壁によって区切られたスクリュ圧縮機において、
前記軸受室内の前記軸受より前記吸込流路側に、前記軸受室を区分するリップシールを有し、
前記軸受室の前記リップシールより前記吸込流路側の空間に潤滑流体を導入する潤滑流路を設けたことを特徴とするスクリュ圧縮機。 A partition wall through which the rotor shaft penetrates a suction passage for sucking a target gas into a rotor chamber that houses a male and female screw rotor and a bearing chamber that holds a bearing that supports a rotor shaft on the suction side of the screw rotor In the screw compressor separated by
A lip seal that divides the bearing chamber on the suction flow path side from the bearing in the bearing chamber;
A screw compressor characterized in that a lubricating flow path is provided for introducing a lubricating fluid into a space closer to the suction flow path than the lip seal of the bearing chamber. 前記潤滑流体が水であることを特徴とする請求項７に記載のスクリュ圧縮機。   The screw compressor according to claim 7, wherein the lubricating fluid is water.
JP2008001176A 2008-01-08 2008-01-08 Screw compressor Pending JP2009162129A (en)

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KR1020080135552A KR20090076786A (en) 2008-01-08 2008-12-29 Screw compressor
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JP2012127314A (en) * 2010-12-17 2012-07-05 Kobe Steel Ltd Water injection type screw fluid machine
CN102562596A (en) * 2010-12-27 2012-07-11 株式会社神户制钢所 Water injection type screw fluid machine
KR101376000B1 (en) 2011-03-11 2014-03-19 가부시키가이샤 고베 세이코쇼 Water injection type screw fluid machine

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JP5390478B2 (en) * 2010-07-01 2014-01-15 株式会社神戸製鋼所 Screw steam machine
JP5425009B2 (en) * 2010-07-21 2014-02-26 株式会社神戸製鋼所 Fluid machinery
US10451061B2 (en) * 2016-05-06 2019-10-22 Ingersoll-Rand Company Compressor having non-contact and contact seals
CN109236655A (en) * 2018-09-29 2019-01-18 沈阳天朗艾尔压缩机有限公司 A kind of water lubrication sliding-vane air compressor
CN109488598A (en) * 2018-12-29 2019-03-19 无锡五洋赛德压缩机有限公司 Sealing structure and balanced seal structure applied to helical-lobe compressor

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DE29807796U1 (en) * 1998-04-30 1999-09-09 GHH-RAND Schraubenkompressoren GmbH & Co. KG, 46145 Oberhausen Sealing arrangement for a shaft journal of a dry-running rotary screw compressor
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012127314A (en) * 2010-12-17 2012-07-05 Kobe Steel Ltd Water injection type screw fluid machine
CN102562596A (en) * 2010-12-27 2012-07-11 株式会社神户制钢所 Water injection type screw fluid machine
KR101262592B1 (en) 2010-12-27 2013-05-08 가부시키가이샤 고베 세이코쇼 Water injection type screw fluid machine
KR101376000B1 (en) 2011-03-11 2014-03-19 가부시키가이샤 고베 세이코쇼 Water injection type screw fluid machine

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