JP2007040294A - Two-stage screw compressor - Google Patents

Two-stage screw compressor Download PDF

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JP2007040294A
JP2007040294A JP2006147063A JP2006147063A JP2007040294A JP 2007040294 A JP2007040294 A JP 2007040294A JP 2006147063 A JP2006147063 A JP 2006147063A JP 2006147063 A JP2006147063 A JP 2006147063A JP 2007040294 A JP2007040294 A JP 2007040294A
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stage
stage compressor
compressor body
box
motor
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JP4927446B2 (en
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Noboru Tsuboi
昇 壷井
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Kobe Steel Ltd
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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
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • 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
    • F04C2210/00—Fluid
    • F04C2210/26—Refrigerants with particular properties, e.g. HFC-134a
    • 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)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-stage screw compressor having improved reliability without giving damage to the outside even when using toxic operating gas by preventing the entry of air and the leakage of the operating gas to the outside. <P>SOLUTION: The two-stage screw compressor comprises a first-stage compressor body 11 on the low pressure side, a second-stage compressor body 13 on the high pressure side, a box forming a gas passage connecting a discharge port 23 of the first-stage compressor body to a suction port 31 of the second-stage compressor body, a motor 14, a driving shaft 37 to be driven by the motor, rotor shafts 24, 33 extending from the first-stage compressor body and the second-stage compressor body, respectively, into the box, power transmission mechanisms 25, 34, 37 existing in the box for transmitting the power of the driving shaft to the rotor shafts, and a mechanical seal 36 arranged between the driving shaft and the casing of the box through which the driving shaft passes. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、例えば、ＮＨ３のような毒性物質を冷媒とする冷凍装置に適用される２段形スクリュ圧縮機に関するものである。 The present invention relates to a two-stage screw compressor applied to a refrigeration apparatus using a toxic substance such as NH 3 as a refrigerant.

従来、ＮＨ３のような毒性物質を冷媒とする冷凍装置に適用される２段形スクリュ圧縮機は公知である（例えば、特許文献１、図２参照。）。
実開平７−３８６８３号公報 Conventionally, a two-stage screw compressor applied to a refrigeration apparatus using a toxic substance such as NH 3 as a refrigerant is known (see, for example, Patent Document 1 and FIG. 2).
Japanese Utility Model Publication No. 7-38683

特許文献１には、モータと第１段圧縮機本体、第２段圧縮機本体とが同軸上に配置され、かつそれぞれのケーシングが一体的に結合され、ＮＨ３を冷媒とする冷凍装置に使用される２段形スクリュ圧縮機が開示されている。上記モータは、第１段圧縮機本体の吸込み側に位置しており、この第１段圧縮機本体における一方のスクリュロータのロータ軸、カップリングを介して上記モータの出力軸に結合されている。 In Patent Document 1, the motor, the first-stage compressor body, and the second-stage compressor body are coaxially arranged, and the respective casings are integrally coupled, and used for a refrigeration apparatus using NH 3 as a refrigerant. A two-stage screw compressor is disclosed. The motor is located on the suction side of the first stage compressor body, and is coupled to the output shaft of the motor via the rotor shaft and coupling of one screw rotor in the first stage compressor body. .

第１段圧縮機本体の上記ロータ軸の周囲、及び上記出力軸の周囲には、回転部と固定部との間の摺動面に冷却、潤滑用の潤滑油が噴射されるメカニカルシールが配設され、上記カップリングの収容空間と第１段圧縮機本体、及び上記モータ、それぞれの内部空間との間におけるガス漏れを封じるように形成されている。   Around the rotor shaft and the output shaft of the first stage compressor body, mechanical seals that cool and lubricate lubricating oil are injected on the sliding surface between the rotating portion and the fixed portion. It is formed so as to seal the gas leakage between the accommodation space of the coupling and the first stage compressor main body, the motor, and the respective internal spaces.

上記冷凍装置は、周知のように、圧縮機、凝縮器、膨張弁及び蒸発器を含む冷媒の循環流路を備えている。そして、この蒸発器における冷媒の蒸発温度が−４５℃〜−７５℃の低温になった場合、蒸発器に直接通じる第１段圧縮機本体の吸込圧力は大気圧以下となる。一方、カップリングの収容空間及び上記モータ内の空間は大気圧の状態となっており、空気が上記収容空間から上記メカニカルシールの摺動面を経て第１段圧縮機本体内、特にこの吸込み側に侵入する可能性がある。   As is well known, the refrigeration apparatus includes a refrigerant circulation passage including a compressor, a condenser, an expansion valve, and an evaporator. And when the evaporation temperature of the refrigerant | coolant in this evaporator becomes low temperature of -45 degreeC--75 degreeC, the suction pressure of the 1st stage compressor main body directly connected to an evaporator will be below atmospheric pressure. On the other hand, the accommodation space of the coupling and the space in the motor are in an atmospheric pressure state, and the air passes through the sliding surface of the mechanical seal from the accommodation space and in the first stage compressor body, particularly on the suction side. May invade.

この摺動面には、上述したように潤滑油が噴射されており、この潤滑油が上記収容空間からの空気に接触すると潤滑油の炭化物が発生し、これが上記摺動面に蓄積されてゆく結果、上記摺動面におけるシール機能が低下してゆくという問題がある。   Lubricating oil is sprayed on the sliding surface as described above, and when the lubricating oil comes into contact with the air from the housing space, carbides of the lubricating oil are generated and accumulated on the sliding surface. As a result, there exists a problem that the sealing function in the said sliding surface falls.

また、圧縮機を停止させると、第１段圧縮機本体の吸込口が大気圧より高い圧力状態となり、上述したようにシール機能が低下していると、上記摺動面の箇所から毒性のあるＮＨ３が上記カップリングの収容空間及び上記モータの空間を経て、機外に漏出してしまうという問題がある。 Further, when the compressor is stopped, the suction port of the first stage compressor body is in a pressure state higher than the atmospheric pressure, and if the sealing function is lowered as described above, it is toxic from the position of the sliding surface. There is a problem that NH 3 leaks out of the apparatus through the coupling housing space and the motor space.

さらに、このようにＮＨ３がモータ内に漏出すると、モータ内のコイル巻線が腐食するという問題が生じる。 Furthermore, when NH 3 leaks into the motor in this way, there arises a problem that the coil winding in the motor corrodes.

本発明は、斯かる従来の問題を解決する事を課題としてなされたもので、空気の侵入、及び外部への作動ガスの漏出を防止し、たとえ作動ガスに毒性があっても、外部に害をもたらさない信頼性の高い２段形スクリュ圧縮機を提供しようとするものである。   The present invention has been made to solve such a conventional problem, and prevents intrusion of air and leakage of the working gas to the outside. Even if the working gas is toxic, it is harmful to the outside. It is an object of the present invention to provide a highly reliable two-stage screw compressor that does not lead to the above.

上記課題を解決するために、本発明は、
２段形スクリュ圧縮機であって、
低圧側の第１段圧縮機本体と、
高圧側の第２段圧縮機本体と、
上記第１段圧縮機本体の吐出口と上記第２段圧縮機本体の吸込口とを結ぶガス通路を形成する箱体と、
モータと、
上記モータにより駆動される駆動軸と、
上記第１段圧縮機本体及び上記第２段圧縮機本体のそれぞれから上記箱体内に延びるロータ軸と、
上記箱体内に在って上記駆動軸の動力を上記各ロータ軸に伝達する動力伝達機構と、
上記駆動軸と上記駆動軸が貫通する上記箱体のケーシングとの間に配設されたメカニカルシールと、
を備えた構成とした。 In order to solve the above problems, the present invention provides:
A two-stage screw compressor,
A first stage compressor body on the low pressure side;
A second stage compressor body on the high pressure side;
A box forming a gas passage connecting the discharge port of the first stage compressor body and the suction port of the second stage compressor body;
A motor,
A drive shaft driven by the motor;
A rotor shaft extending from each of the first stage compressor body and the second stage compressor body into the box;
A power transmission mechanism in the box for transmitting the power of the drive shaft to the rotor shafts;
A mechanical seal disposed between the drive shaft and the casing of the box through which the drive shaft passes;
It was set as the structure provided with.

上記構成に加え、上記動力伝達機構は、上記ロータ軸に取り付けられたピニオンギヤと、上記各ピニオンギヤと噛み合い、上記駆動軸に取り付けられたプルギヤとからなることが好ましい。また、上記第１段圧縮機本体、上記第２段圧縮機本体、及び上記箱体が一体に構成されていることが好ましい。さらに、上記モータがインバータにより回転数制御されるものであることが好ましい。   In addition to the above configuration, the power transmission mechanism preferably includes a pinion gear attached to the rotor shaft, and a pull gear that meshes with each pinion gear and is attached to the drive shaft. Moreover, it is preferable that the said 1st stage compressor main body, the said 2nd stage compressor main body, and the said box are comprised integrally. Furthermore, it is preferable that the number of revolutions of the motor is controlled by an inverter.

上記第１段圧縮機本体及び上記第２段圧縮機本体が、上記箱体の同じ側に配設され、
上記モータが、上記箱体の上記第１段圧縮機本体及び上記第２段圧縮機本体と反対側に配設され、あるいは上記箱体の上記第１段圧縮機本体及び上記第２段圧縮機本体と同じ側に配設されていてもよい。 The first stage compressor body and the second stage compressor body are disposed on the same side of the box,
The motor is disposed on the opposite side of the box body from the first stage compressor body and the second stage compressor body, or the box body includes the first stage compressor body and the second stage compressor. It may be arranged on the same side as the main body.

本発明に係る２段形スクリュ圧縮機によれば、空気の侵入、及び外部への作動ガスの漏出を防止し、たとえ作動ガスに毒性があっても、外部に害をもたらすことはなく、信頼性を向上させることが可能になるという効果を奏する。   According to the two-stage screw compressor according to the present invention, the intrusion of air and the leakage of the working gas to the outside are prevented, and even if the working gas is toxic, there is no harm to the outside. It is possible to improve the performance.

次に、本発明の実施形態を図面にしたがって説明する。
図１は、本発明の第１実施形態に係る２段形スクリュ圧縮機１を示し、この２段形スクリュ圧縮機１は、低圧側の第１段圧縮機本体１１と、この第１段圧縮機本体１１とは、歯車箱１２を介して一体的に、かつ歯車箱１２の同じ側に配設された高圧側の第２段圧縮機本体１３と、上記歯車箱１２の上記側とは反対側に配設されたモータ１４とを備えている。なお、ここでいう「歯車箱１２の同じ側」、「歯車箱１２の上記側」とは、歯車箱１２を基準として、それより図面上左側を意味する。また、「反対側」とは、歯車箱１２を基準として、それより図面上右側を意味する。また、第１段圧縮機本体１１、第２段圧縮機本体１３及び歯車箱１２のそれぞれのケーシングは１５，１６及び１７は一体的に形成されている。 Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a two-stage screw compressor 1 according to a first embodiment of the present invention. The two-stage screw compressor 1 includes a first-stage compressor body 11 on a low-pressure side and a first-stage compressor. The machine body 11 is opposite to the side of the gear box 12 and the second stage compressor body 13 on the high-pressure side, which is integrally disposed on the same side of the gear box 12 via the gear box 12. And a motor 14 disposed on the side. Here, “the same side of the gear box 12” and “the above side of the gear box 12” mean the left side of the drawing with the gear box 12 as a reference. The “opposite side” means the right side of the drawing with reference to the gear box 12. Also, the casings 15, 16, and 17 of the first stage compressor body 11, the second stage compressor body 13, and the gear box 12 are integrally formed.

第１段圧縮機本体１１は、回転可能に設けられた互いに噛み合う雌雄一対のスクリュロータ２１を有し、歯車箱１２から離れた側に吸込口２２を有する一方、これとは反対側に歯車箱１２内に開口した吐出口２３を有している。またスクリュロータ２１の一方のロータ軸２４は歯車箱１２内に延び、ロータ軸２４の軸端部には、ピニオンギヤ２５が取付けられている。さらに、第１段圧縮機本体１１の吸込み側は、モータ１４とは離れた非駆動側にあり、軸受を介して延びた吸込み側のロータ軸２８の端部は完全に外部とは遮断されている。   The first stage compressor body 11 has a pair of male and female screw rotors 21 that are rotatably provided and have a pair of male and female screw rotors 21, and has a suction port 22 on the side away from the gear box 12, and a gear box on the opposite side thereof. 12 has a discharge port 23 opened in the inside. One rotor shaft 24 of the screw rotor 21 extends into the gear box 12, and a pinion gear 25 is attached to the shaft end of the rotor shaft 24. Further, the suction side of the first stage compressor body 11 is on the non-driving side away from the motor 14, and the end of the suction side rotor shaft 28 extending through the bearing is completely cut off from the outside. Yes.

第２段圧縮機本体１３は、回転可能に設けられた互いに噛み合う雌雄一対のスクリュロータ２９を有し、歯車箱１２に開口した吸込口３１を有する一方、これとは反対側の歯車箱１２から離れた側に吐出口３２を有している。また、スクリュロータ２９の一方のロータ軸３３は歯車箱１２内に延び、ロータ軸３３の軸端部には、ピニオンギヤ３４が取付けられている。なお、第１段圧縮機本体１１と同様、第２段圧縮機本体１３の吸込み側のロータ軸の軸端部も外部とは完全に遮断されている。   The second-stage compressor main body 13 has a pair of male and female screw rotors 29 that are rotatably provided and have a suction port 31 that is open to the gear box 12, while the gear box 12 on the opposite side thereof has a suction port 31. A discharge port 32 is provided on the remote side. Further, one rotor shaft 33 of the screw rotor 29 extends into the gear box 12, and a pinion gear 34 is attached to the shaft end portion of the rotor shaft 33. Note that, similarly to the first stage compressor body 11, the shaft end portion of the rotor shaft on the suction side of the second stage compressor body 13 is also completely cut off from the outside.

モータ１４の出力軸３５には、歯車箱１２のメカニカルシール３６を介してケーシング１７を貫通する駆動軸３７がカップリング３８により結合されている。また、歯車箱１２内に延びた駆動軸３７の軸端部には、ピニオンギヤ２５、３４と噛み合うブルギヤ３９が取付けられている。なお、メカニカルシール３６を図示している部位には、メカニカルシール３６のほか、駆動軸３７を回転自在に支持する軸受を設けるのが望ましい。   A drive shaft 37 that penetrates the casing 17 is coupled to the output shaft 35 of the motor 14 via a mechanical seal 36 of the gear box 12 by a coupling 38. A bull gear 39 that meshes with the pinion gears 25 and 34 is attached to the shaft end portion of the drive shaft 37 extending into the gear box 12. In addition, in addition to the mechanical seal 36, it is desirable to provide a bearing that rotatably supports the drive shaft 37 at a portion where the mechanical seal 36 is illustrated.

上記構成からなる２段形スクリュ圧縮機１において、歯車箱１２内の空間は中間流路を形成しており、第１段圧縮機本体１１の吸込口２２における吸込圧力と第２段圧縮機本体１３の吐出口３２における吐出圧力との間の中間圧力の状態にあり、一般的には、上記吸込圧力が大気圧力以下になっても中間圧力は大気圧力以上となっている。   In the two-stage screw compressor 1 having the above configuration, the space in the gear box 12 forms an intermediate flow path, and the suction pressure at the suction port 22 of the first-stage compressor body 11 and the second-stage compressor body. Therefore, the intermediate pressure is generally equal to or higher than the atmospheric pressure even when the suction pressure is equal to or lower than the atmospheric pressure.

そして、この２段形スクリュ圧縮機１では、第１段圧縮機本体１１の吸込圧力が大気圧力以下になっても、この吸込み側のロータ軸２８の軸端部は完全に外部とは遮断されている故、この軸端部から空気が侵入することはない。また、外部とはメカニカルシール３６を介して隔てられた歯車箱１２内の空間、即ち中間流路は大気圧力以上の状態にあるため、外部から空気が侵入することはなく、ここでもメカニカルシール２７に上述した炭化物が生じることによるシール機能の低下も防止され、たとえ作動ガスに毒性があっても、外部に害をもたらさず、当然歯車箱１２から分離されたモータ１４内のコイル巻線の腐食の発生も防止され、２段形スクリュ圧縮機１の信頼性が高められている。   In the two-stage screw compressor 1, even if the suction pressure of the first-stage compressor body 11 is equal to or lower than the atmospheric pressure, the shaft end portion of the rotor shaft 28 on the suction side is completely cut off from the outside. Therefore, air does not enter from the end of the shaft. Further, since the space in the gear box 12 separated from the outside through the mechanical seal 36, that is, the intermediate flow path is in a state higher than the atmospheric pressure, air does not enter from the outside. The above-described reduction in the sealing function due to the formation of carbides is also prevented, and even if the working gas is toxic, no harm is caused to the outside, and naturally the coil winding in the motor 14 separated from the gear box 12 is corroded. Is prevented, and the reliability of the two-stage screw compressor 1 is enhanced.

また、省エネルギの観点から、モータ１４をインバータにより回転数制御することにより２段形スクリュ圧縮機１を容量調整可能としてもよい。例えば、上述の２段形スクリュ圧縮機１の低圧側の第１段圧縮機本体１１にスライド弁を設け、容量調整可能に構成した場合、特にそのスライド弁をいわゆるアンロードの状態に保持した際に、第１段圧縮機本体１１からの吐出量より第２段圧縮機本体１３への吸い込み量のほうが大きくなり、中間圧力が大気圧以下となり、従来技術と同様の問題が生じるおそれがある。
しかしながら、インバータを用いて容量調整可能とした場合、回転数を低下させて、アンロードの状態に保持しても、中間圧力は常に大気圧以上となり従来技術のような問題が生じるおそれがない。また、インバータを用いて容量調整可能とした場合、従来のように容量調整をスライド弁により行うようにしたスクリュ圧縮機に比し、構造が簡単になり、スライド弁により行うようにしたスクリュ圧縮機とは異なり、信頼性が高いものとなる。 From the viewpoint of energy saving, the capacity of the two-stage screw compressor 1 may be adjustable by controlling the rotational speed of the motor 14 with an inverter. For example, when a slide valve is provided in the first-stage compressor main body 11 on the low pressure side of the above-described two-stage screw compressor 1 so that the capacity can be adjusted, particularly when the slide valve is held in a so-called unloaded state. In addition, the suction amount into the second stage compressor body 13 is larger than the discharge amount from the first stage compressor body 11, and the intermediate pressure becomes lower than the atmospheric pressure, which may cause the same problem as in the prior art.
However, when the capacity can be adjusted by using an inverter, even if the rotational speed is lowered and kept in an unloaded state, the intermediate pressure is always higher than the atmospheric pressure, and there is no possibility of causing a problem as in the prior art. In addition, when the capacity can be adjusted using an inverter, the screw compressor has a simpler structure and is configured to use a slide valve than the conventional screw compressor that uses a slide valve to adjust the capacity. Unlike, it is highly reliable.

図２は、本発明の第２実施形態に係る２段形スクリュ圧縮機１０を示し、この２段形スクリュ圧縮機１０は、低圧側の第１段圧縮機本体１１と、この第１段圧縮機本体１１とは、歯車箱１２を介して一体的に、かつ歯車箱１２の同じ側に配設された高圧側の第２段圧縮機本体１３と、上記各圧縮機側とは同じ側に配設されたモータ１４とを備えている。すなわち、図１の第１実施形態とは、モータ１４及び駆動軸３７（カップリング３８、メカニカルシール３６を含む）の位置のみが異なり、残りの構成は同じであるので、第１実施形態と同様の作用効果を奏するので、その説明は省略する。   FIG. 2 shows a two-stage screw compressor 10 according to a second embodiment of the present invention. The two-stage screw compressor 10 includes a first-stage compressor body 11 on the low-pressure side and the first-stage compression. The machine main body 11 is integrated with the gear box 12 on the same side of the gear box 12, and the second-stage compressor main body 13 on the high pressure side is disposed on the same side as the compressor side. And an arranged motor 14. That is, the first embodiment shown in FIG. 1 differs from the first embodiment only in the positions of the motor 14 and the drive shaft 37 (including the coupling 38 and the mechanical seal 36), and the remaining configuration is the same. Therefore, the description thereof will be omitted.

以上のように、本発明においては、本発明の特徴である、第１段圧縮機本体１１の吐出口２３と第２段圧縮機１３の吸込口３１とを結ぶガス通路を形成する箱体（歯車箱）１２があること、モータ１４の駆動軸３７がメカニカルシール３６を配設されたうえでその箱体１２を貫いていること、及び駆動軸３７の動力を両圧縮機へ伝達する機構がその箱体の中に設けられていることを満たす限り、第１段圧縮機本体１１、第２段圧縮機本体１３及びモータ１４の位置関係は、任意に構成することができる。   As described above, in the present invention, a box body that forms a gas passage connecting the discharge port 23 of the first stage compressor body 11 and the suction port 31 of the second stage compressor 13, which is a feature of the present invention ( A gear box) 12, a drive shaft 37 of the motor 14 is provided with a mechanical seal 36 and penetrates the box body 12, and a mechanism for transmitting the power of the drive shaft 37 to both compressors. As long as it satisfies what is provided in the box, the positional relationship of the 1st stage | paragraph compressor main body 11, the 2nd stage | paragraph compressor main body 13, and the motor 14 can be comprised arbitrarily.

また、駆動軸３７の動力を両圧縮機へ伝達する機構についても、本発明の上記特徴的構成を満足している限り、上記実施形態の機構に限定されない。例えば、駆動軸３７が片方の圧縮機のロータ軸と直結され且つ他方の圧縮機のロータ軸への動力伝達が歯車機構により行われる構成でもよい。   Further, the mechanism for transmitting the power of the drive shaft 37 to both the compressors is not limited to the mechanism of the above embodiment as long as the above-described characteristic configuration of the present invention is satisfied. For example, the drive shaft 37 may be directly connected to the rotor shaft of one compressor and the power transmission to the rotor shaft of the other compressor may be performed by a gear mechanism.

本発明の第１実施形態に係る２段形スクリュ圧縮機の断面図である。1 is a cross-sectional view of a two-stage screw compressor according to a first embodiment of the present invention. 本発明の第２実施形態に係る２段形スクリュ圧縮機の断面図である。It is sectional drawing of the two-stage screw compressor which concerns on 2nd Embodiment of this invention.

符号の説明Explanation of symbols

１，１０ ２段形スクリュ圧縮機
１１ 第１段圧縮機本体
１２ 歯車箱（箱体）
１３ 第２段圧縮機本体
１４ モータ
１５,１６,１７ ケーシング
２１ スクリュロータ
２２ 吸込口
２３ 吐出口
２４ ロータ軸
２５ ピニオンギヤ
２８ ロータ軸
２９ スクリュロータ
３１ 吸込口
３２ 吐出口
３３ ロータ軸
３４ ピニオンギヤ
３５ 出力軸
３６ メカニカルシール
３７ 駆動軸
３８ カップリング
３９ ブルギヤ 1,10 Two-stage screw compressor 11 First stage compressor body 12 Gear box (box)
13 Second stage compressor body 14 Motor 15, 16, 17 Casing 21 Screw rotor 22 Suction port 23 Discharge port 24 Rotor shaft 25 Pinion gear 28 Rotor shaft 29 Screw rotor 31 Suction port 32 Discharge port 33 Rotor shaft 34 Pinion gear 35 Output shaft 36 Mechanical seal 37 Drive shaft 38 Coupling 39 Bull gear

Claims (6)

２段形スクリュ圧縮機であって、
低圧側の第１段圧縮機本体と、
高圧側の第２段圧縮機本体と、
上記第１段圧縮機本体の吐出口と上記第２段圧縮機本体の吸込口とを結ぶガス通路を形成する箱体と、
モータと、
上記モータにより駆動される駆動軸と、
上記第１段圧縮機本体及び上記第２段圧縮機本体のそれぞれから上記箱体内に延びるロータ軸と、
上記箱体内に在って上記駆動軸の動力を上記各ロータ軸に伝達する動力伝達機構と、
上記駆動軸と上記駆動軸が貫通する上記箱体のケーシングとの間に配設されたメカニカルシールと、
を備えたことを特徴とする２段形スクリュ圧縮機。 A two-stage screw compressor,
A first stage compressor body on the low pressure side;
A second stage compressor body on the high pressure side;
A box forming a gas passage connecting the discharge port of the first stage compressor body and the suction port of the second stage compressor body;
A motor,
A drive shaft driven by the motor;
A rotor shaft extending from each of the first stage compressor body and the second stage compressor body into the box;
A power transmission mechanism in the box for transmitting the power of the drive shaft to the rotor shafts;
A mechanical seal disposed between the drive shaft and the casing of the box through which the drive shaft passes;
A two-stage screw compressor characterized by comprising: 上記動力伝達機構は、
上記ロータ軸に取り付けられたピニオンギヤと、
上記各ピニオンギヤと噛み合い、上記駆動軸に取り付けられたプルギヤとからなることを特徴とする請求項１に記載の２段形スクリュ圧縮機。 The power transmission mechanism is
A pinion gear attached to the rotor shaft;
2. The two-stage screw compressor according to claim 1, wherein the two-stage screw compressor includes a pull gear that meshes with each of the pinion gears and is attached to the drive shaft. 上記第１段圧縮機本体、上記第２段圧縮機本体、及び上記箱体が一体に構成されていることを特徴とする請求項１又は２に記載の２段形スクリュ圧縮機。   The two-stage screw compressor according to claim 1 or 2, wherein the first-stage compressor main body, the second-stage compressor main body, and the box are integrally formed. 上記モータがインバータにより回転数制御されるものであることを特徴とする請求項１から３のいずれかに記載の２段形スクリュ圧縮機。   The two-stage screw compressor according to any one of claims 1 to 3, wherein the motor has a rotational speed controlled by an inverter. 上記第１段圧縮機本体及び上記第２段圧縮機本体が、上記箱体の同じ側に配設され、
上記モータが、上記箱体の上記第１段圧縮機本体及び上記第２段圧縮機本体と反対側に配設されていることを特徴とする請求項１から４のいずれかに記載の２段形スクリュ圧縮機。 The first stage compressor body and the second stage compressor body are disposed on the same side of the box,
The two-stage according to any one of claims 1 to 4, wherein the motor is disposed on the opposite side of the box body from the first-stage compressor body and the second-stage compressor body. Screw compressor. 上記第１段圧縮機本体及び上記第２段圧縮機本体が、上記箱体の同じ側に配設され、
上記モータが、上記箱体の上記第１段圧縮機本体及び上記第２段圧縮機本体と同じ側に配設されていることを特徴とする請求項１から４のいずれかに記載の２段形スクリュ圧縮機。 The first stage compressor body and the second stage compressor body are disposed on the same side of the box,
The two-stage according to any one of claims 1 to 4, wherein the motor is disposed on the same side of the box as the first-stage compressor body and the second-stage compressor body. Screw compressor.
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