JPH062677A - Multistage type oil-free compressor - Google Patents
Multistage type oil-free compressorInfo
- Publication number
- JPH062677A JPH062677A JP15649192A JP15649192A JPH062677A JP H062677 A JPH062677 A JP H062677A JP 15649192 A JP15649192 A JP 15649192A JP 15649192 A JP15649192 A JP 15649192A JP H062677 A JPH062677 A JP H062677A
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- Prior art keywords
- stage compressor
- valve
- flow path
- passage
- compressor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、吸気調節弁を備えた多
段型オイルフリー圧縮機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage oil-free compressor equipped with an intake control valve.
【０００２】[0002]
【従来の技術】従来、図３に示す多段型の一例である、
２段型オイルフリースクリュ圧縮機が公知であり、第１
段圧縮機本体１の吸込流路２に吸気調節弁３が、第１段
圧縮機本体１と第２段圧縮機本体４との間の中間流路５
に中間冷却器６とドレンセパレータ７が、第２段圧縮機
本体７の吐出流路８に逆止弁９とアフタークーラ１０が
設けてある。ここで、吸気調節弁３は、後に詳述するよ
うに、図示しない流路とともに設けてあり、第１段圧縮
機本体１の吸込流路２を閉じ、第２段圧縮機本体７と逆
止弁９との間の吐出流路８の一次側部分８ａを大気連通
状態とする無負荷運転状態と、吸込流路２を開き、上記
一次側部分８ａを大気非連通状態とする負荷運転状態と
に切換え可能に形成したものである。これにより、第１
段圧縮機本体１の吸気容量調整を行っている。2. Description of the Related Art Conventionally, this is an example of a multi-stage type shown in FIG.
Two-stage oil-free screw compressors are known and
An intake control valve 3 is provided in a suction passage 2 of the stage compressor body 1, and an intermediate passage 5 between the first stage compressor body 1 and the second stage compressor body 4 is provided.
Further, an intercooler 6 and a drain separator 7 are provided, and a check valve 9 and an aftercooler 10 are provided in a discharge passage 8 of the second stage compressor body 7. Here, as will be described in detail later, the intake control valve 3 is provided together with a flow path (not shown), closes the suction flow path 2 of the first-stage compressor body 1, and reverse-checks with the second-stage compressor body 7. A no-load operation state in which the primary side portion 8a of the discharge flow path 8 with the valve 9 is in an atmosphere communication state, and a load operation state in which the suction flow path 2 is opened and the primary side portion 8a is in an atmosphere non-communication state. It is formed to be switchable to. This makes the first
The intake capacity of the stage compressor body 1 is adjusted.
【０００３】そして、第１圧縮機本体１にて、例えば約
２ｋｇ／ｃｍ2まで圧縮した空気は、約１８０°Ｃと高
温になるため、中間流路５に中間冷却器６を設けて、こ
れが例えば水冷式の場合には、圧縮空気を冷却水入口温
度プラス約１５°Ｃまで冷却する。このとき、中間冷却
器６にて凝縮水（ドレン）が発生し、この凝縮水を第２
段圧縮機本体７の吸気中に含ませると、第２段圧縮機本
体７のロータ，ケーシングを腐食させることになる。こ
のため、中間冷却器６の出口にドレンセパレータ７を設
けて、圧縮空気から凝縮水を分離するようにしてある。Since the air compressed to about 2 kg / cm 2 in the first compressor body 1 reaches a high temperature of about 180 ° C., an intermediate cooler 6 is provided in the intermediate flow path 5 and For example, in the case of the water cooling type, the compressed air is cooled to the cooling water inlet temperature plus about 15 ° C. At this time, condensed water (drain) is generated in the intercooler 6, and the condensed water is discharged to the second
If it is included in the intake air of the stage compressor body 7, the rotor and casing of the second stage compressor body 7 will be corroded. Therefore, a drain separator 7 is provided at the outlet of the intercooler 6 to separate condensed water from compressed air.
【０００４】[0004]
【発明が解決しようとする課題】上記従来の装置では、
中間冷却器６にて発生した凝縮水をドレンセパレータ７
にて分離するようにしてあるが、分離効率は１００％で
ない故、若干量の凝縮水が第２段圧縮機本体７に圧縮空
気とともに吸込まれるのが現状である。このように第２
段圧縮機本体７に吸込まれた若干量の凝縮水は、連続運
転中は圧縮熱により蒸発する故、問題はない。しかしな
がら、圧縮機の停止後、長時間経過すると、停止直前に
発生した凝縮水、さらに圧縮機停止前に通常行われる無
負荷運転時にアフタークーラ１０から逆止弁９を通過し
て逆流して来た凝縮水、即ち逆止弁９が閉じるまでの僅
かな時間、或はこの閉じるときに弁体が少しハンチング
する間に逆流して来た凝縮水の影響で、特に第２段圧縮
機本体７に錆が生じる。この錆が生じると、第２段圧縮
機本体７の性能低下の原因となり、さらにロータ同志の
固着現象を引起こすことになる。In the above-mentioned conventional device,
Condensed water generated in the intercooler 6 is used as a drain separator 7
However, since the separation efficiency is not 100%, a small amount of condensed water is sucked into the second stage compressor body 7 together with the compressed air under the present circumstances. Second like this
There is no problem because a small amount of condensed water sucked into the main stage compressor body 7 is evaporated by the heat of compression during continuous operation. However, after a long time has passed after the compressor was stopped, the condensed water generated immediately before the stoppage, and the backflow from the aftercooler 10 through the check valve 9 during the no-load operation normally performed before the compressor is stopped. The condensed water, that is, the condensed water that has flowed backward for a short time until the check valve 9 is closed, or while the valve body is slightly hunting at the time of closing, particularly the second stage compressor body 7 Rust occurs on the. If this rust occurs, it will cause the performance of the second-stage compressor body 7 to deteriorate, and further cause the sticking phenomenon between the rotors.
【０００５】この好ましくない現象の発生を防止するた
め、圧縮機の長時間停止の前には、圧縮機本体内部に乾
燥窒素を封入する等の煩わしい防錆処置が必要になると
いう問題があった。本発明は、斯る従来の問題点を課題
としてなされたもので、圧縮機の停止の際に、無負荷運
転操作を行うだけで、容易、かつ確実に、さらに短時間
に圧縮機本体内から凝縮水を無くすことを可能とした多
段型オイルフリー圧縮機を提供しようとするものであ
る。In order to prevent the occurrence of this undesired phenomenon, there is a problem that before the compressor is stopped for a long time, a troublesome rust preventive measure such as enclosing dry nitrogen in the compressor body is required. . The present invention has been made to solve the above-mentioned conventional problems, and when the compressor is stopped, it can be operated easily and surely from the inside of the compressor body in a short time by simply performing a no-load operation. It is intended to provide a multi-stage oil-free compressor capable of eliminating condensed water.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、２段以上に直列配置した圧縮機本体と、
最終段圧縮機本体の吐出流路に設けた逆止弁と、第１段
圧縮機本体の吸込流路を閉じ、最終段圧縮機本体と上記
逆止弁との間の吐出流路の一次側部分を大気連通状態と
する無負荷運転状態、および上記吸込流路を開き、上記
一次側部分を大気非連通状態とする負荷運転状態に切換
え可能に形成するとともに、上記吸込流路に設けた吸気
調節弁と、圧縮機本体間の中間流路に中間冷却器とを備
えた多段型オイルフリー圧縮機において、少なくとも第
１段圧縮機本体と第１，第２段圧縮機本体間の中間冷却
器との間の中間流路の部分と、上記大気連通状態と上記
大気非連通状態とに切換える上記吸気調節弁内の空間と
を開閉弁を介して連通させるバイパス流路を設けるとと
もに、上記無負荷運転状態への移行の際に、上記開閉弁
を開状態に移行可能に形成した。In order to solve the above-mentioned problems, the present invention provides a compressor body in which two or more stages are arranged in series,
The check valve provided in the discharge passage of the final stage compressor body and the suction passage of the first stage compressor body are closed, and the primary side of the discharge passage between the final stage compressor body and the check valve is closed. The intake air provided in the suction flow path is formed so as to be switchable to a no-load operation state in which a portion is in the atmosphere communication state and a load operation state in which the suction flow path is opened and the primary side portion is in the air non-communication state. A multi-stage oil-free compressor including a control valve and an intercooler in an intermediate flow path between the compressor bodies, wherein at least an intercooler between the first-stage compressor body and the first and second-stage compressor bodies The intermediate flow path portion between and, and a bypass flow path for communicating the space in the intake control valve for switching between the atmosphere communication state and the atmosphere non-communication state via an on-off valve, and the no load The above-mentioned on-off valve can be moved to the open state when shifting to the operating state. It was formed in.
【０００７】[0007]
【作用】上記発明のように構成することにより、圧縮機
を停止させる前に行なう無負荷運転と同時に、最終段圧
縮機本体からの高温の吐出空気の一部を、少なくとも第
２段圧縮機本体の吸込側に導く乾燥運転を、容易かつ確
実に行えるようになる。According to the above-mentioned invention, at the same time as the no-load operation performed before the compressor is stopped, at least a portion of the hot air discharged from the final stage compressor body is at least in the second stage compressor body. The drying operation leading to the suction side can be performed easily and surely.
【０００８】[0008]
【実施例】次に、本発明の一実施例を図面にしたがって
説明する。図１，図２は、本発明に係る２段型オイルフ
リースクリュ圧縮機を示し、図３に示す圧縮機の構成部
分と実質的に同一の構成部分については、同一番号を付
して示してある。本実施例に係る圧縮機は、上記同様
に、第１段圧縮機本体１，吸込流路２，吸気調節弁３，
第２段圧縮機本体４，中間流路５，中間冷却器６，ドレ
ンセパレータ７，吐出流路８，逆止弁９、およびアフタ
ークーラ１０を備えている。ここで吸気調節弁３は、ダ
イアフラム１１によって仕切られた吸込流路２側の第１
室１２と反吸込流路２側の第２室１３と、隔壁１４を介
して第２室１３に隣接し、かつ大気に開放した第３室１
５を備え、隔壁１４、および第１室１２と吸込流路２と
の間の隔壁１４ａを貫く弁棒１６の吸込流路２側の端部
には第１弁座１７と共働して吸込流路２を開閉する第１
弁体１８が、また第３室１５側の端部には第３室１５を
吐出流路８、さらに詳しくは逆止弁９の入側である吐出
流路８の一次側部分８ａに連通させる放気流路１９の一
端の開口部２０を第２弁座２１と共働して開閉する第２
弁体２２が弁棒１６と一体作動可能に設けてある。An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a two-stage oil-free screw compressor according to the present invention, in which components substantially the same as those of the compressor shown in FIG. is there. In the compressor according to this embodiment, similarly to the above, the first-stage compressor body 1, the suction flow path 2, the intake control valve 3,
The second stage compressor body 4, an intermediate flow path 5, an intermediate cooler 6, a drain separator 7, a discharge flow path 8, a check valve 9, and an aftercooler 10 are provided. Here, the intake control valve 3 is a first partition on the side of the suction flow path 2 which is partitioned by the diaphragm 11.
The chamber 12 and the second chamber 13 on the side opposite to the suction flow path 2, and the third chamber 1 that is adjacent to the second chamber 13 via the partition wall 14 and is open to the atmosphere.
5, the partition wall 14 and the end portion of the valve rod 16 penetrating the partition wall 14a between the first chamber 12 and the suction flow path 2 on the suction flow path 2 side cooperate with the first valve seat 17 to suck the air. First to open and close the flow path 2
The valve body 18 connects the third chamber 15 to the discharge passage 8 at the end on the side of the third chamber 15, and more specifically to the primary side portion 8a of the discharge passage 8 which is the inlet side of the check valve 9. Second opening and closing of the opening 20 at one end of the discharge passage 19 in cooperation with the second valve seat 21
A valve body 22 is provided so as to be integrally operable with the valve rod 16.
【０００９】第３室１５の大気連通部２３にはサイレン
サ２４が設けてあり、上記一次側部分８ａから開口部２
０，第３室１５を経由して、機外に圧縮空気を放出する
際に生じる騒音を抑制するようにしてある。弁棒１６は
ダイアフラム１１を挟着する挟着板２５を介して軸方向
にダイアフラム１１と一体作動するとともに、第２室１
３内に嵌挿したばね２６によって常時吸込流路２側に付
勢されている。また、Ａ，Ｂ，Ｃポート、および内部に
球状の弁体２７を有する三方弁２８と、一方の側にＤ，
Ｅポートを、他方の側にＦ，Ｇポートを有する四方電磁
弁２９が設けてある。このうち、Ａポートはフィルタ３
０を介してＤポートに、Ｂポートは中間流路５に、Ｃポ
ートは第１弁体１８に対して第１段圧縮機本体１とは反
対側の吸込流路２（以下、この部分を吸込流路２（Ｘ）
という）に連通している。また、Ｅポートは第１弁体１
８に対して第１段圧縮機本体１側の吸込流路２（以下、
この部分を吸込流路２（Ｙ）という）に、Ｆポートは第
２室１３に、Ｇポートは絞り弁３１を介して第１室１２
に連通している。A silencer 24 is provided in the atmosphere communicating portion 23 of the third chamber 15 and extends from the primary side portion 8a to the opening portion 2.
The noise generated when the compressed air is released to the outside of the machine via the third and third chambers 15 is suppressed. The valve rod 16 operates integrally with the diaphragm 11 in the axial direction via a sandwiching plate 25 that sandwiches the diaphragm 11, and the second chamber 1
A spring 26 fitted in 3 constantly biases the suction passage 2 side. Further, a three-way valve 28 having A, B, and C ports and a spherical valve body 27 inside, and D, on one side
A four-way solenoid valve 29 having an E port and F and G ports on the other side is provided. Of these, port A is filter 3
0 to the D port, the B port to the intermediate flow passage 5, and the C port to the suction flow passage 2 on the side opposite to the first stage compressor body 1 with respect to the first valve body 18 (hereinafter, this portion will be referred to as Suction channel 2 (X)
I said). The E port is the first valve body 1
8, the suction passage 2 on the side of the first-stage compressor body 1 (hereinafter,
This portion is referred to as the suction flow path 2 (Y)), the F port is in the second chamber 13, and the G port is in the first chamber 12 via the throttle valve 31.
Is in communication with.
【００１０】さらに、第３室１５の大気連通部２３から
電磁弁３２を介して第１段圧縮機本体１と中間冷却器６
との間の中間流路５の部分に至る乾燥運転用のバイパス
流路３３が設けてある。電磁弁３２は、運転員の操作に
より以下に述べる無負荷運転へ移行する際に、その開始
と同時に開き、その終了と同時に閉じるように制御され
るようになっている。なお、図１，２中、※印同志は互
いに、連続していることを示している。Furthermore, the first-stage compressor body 1 and the intercooler 6 are connected from the atmosphere communicating portion 23 of the third chamber 15 via the solenoid valve 32.
There is provided a bypass flow passage 33 for the dry operation, which reaches a portion of the intermediate flow passage 5 between and. The solenoid valve 32 is controlled to open at the start and close at the end when shifting to the no-load operation described below by the operation of the operator. In addition, in FIGS. 1 and 2, the marks * indicate that they are continuous with each other.
【００１１】次に、上記構成からなる圧縮機の作動につ
いて説明する。図１は、圧縮機の負荷運転状態を示し、
四方電磁弁２９は、ＤポートとＧポートとが、またＥポ
ートＦポートとが連通状態にあり、吸込流路２（Ｘ）と
中間流路との圧力差により三方弁２８の弁体２７はＣポ
ートを閉じた状態にある。そして、吸気調節弁３の第１
室１２は、四方電磁弁２９のＧポート，Ｄポート，フィ
ルタ３０、および三方弁２８のＢポートを介して中間流
路５に連通し、大気圧力よりも高圧状態にある。一方吸
気調節弁３の第２室１３は、四方電磁弁２９のＦポー
ト，Ｅポートを介して吸込流路２に連通し、大気圧力と
等しくなっている。このため、第１室１２内の圧力が、
第２室１３およびばね２６による力に打ち勝って、ダイ
ヤフラム１１，弁棒１６とともに、第１弁体１８，第２
弁体２２は図１中右方に押しやられ、吸込流路２を開
き、開口部２０を閉じた状態を保つ。この結果、吐出流
路８の一次側部分８ａは大気と非連通状態に保たれる。
また、この負荷運転時には、電磁弁３２は閉じた状態と
なっている。Next, the operation of the compressor having the above structure will be described. FIG. 1 shows a load operating state of the compressor,
In the four-way solenoid valve 29, the D port and the G port are in communication with each other and the E port and the F port are in communication with each other, and the valve body 27 of the three-way valve 28 is caused by the pressure difference between the suction flow passage 2 (X) and the intermediate flow passage. The C port is closed. Then, the first of the intake control valve 3
The chamber 12 communicates with the intermediate flow path 5 through the G port and D port of the four-way solenoid valve 29, the filter 30, and the B port of the three-way valve 28, and is at a pressure higher than atmospheric pressure. On the other hand, the second chamber 13 of the intake control valve 3 communicates with the suction passage 2 through the F port and the E port of the four-way solenoid valve 29, and has the same atmospheric pressure. Therefore, the pressure in the first chamber 12 is
By overcoming the force of the second chamber 13 and the spring 26, the diaphragm 11, the valve rod 16, the first valve body 18, the second
The valve body 22 is pushed rightward in FIG. 1 to open the suction passage 2 and keep the opening 20 closed. As a result, the primary side portion 8a of the discharge channel 8 is kept in a state of not communicating with the atmosphere.
Further, during this load operation, the solenoid valve 32 is in a closed state.
【００１２】そして、第１段圧縮機本体１に吸込まれた
空気は圧縮され、昇温して中間流路５に吐出され、中間
冷却器６で冷却され、この冷却により発生した凝縮水は
ドレンセパレータ７にて分離，除去された後、第２段圧
縮機本体４に吸込まれる。さらに、この吸込まれた空気
は第２段圧縮機本体４にて圧縮され、昇温して吐出さ
れ、逆止弁９を通って、アフタークーラ１０で冷却され
た後、ユーザー側に送られる。ついで、運転員により、
圧縮機を無負荷運転状態に移行させる操作、例えば押釦
スイッチ操作が行われると、四方電磁弁２９が作動し
て、圧縮機は図２に示す状態となり、同時に電磁弁３２
が開く。The air sucked into the main body 1 of the first-stage compressor is compressed, heated, discharged into the intermediate flow path 5, cooled by the intermediate cooler 6, and the condensed water generated by this cooling is drained. After being separated and removed by the separator 7, it is sucked into the second stage compressor body 4. Further, the sucked air is compressed by the second stage compressor body 4, heated and discharged, passed through the check valve 9, cooled by the aftercooler 10, and then sent to the user side. Then, by the operator,
When an operation for shifting the compressor to a no-load operation state, for example, a push button switch operation is performed, the four-way solenoid valve 29 operates and the compressor enters the state shown in FIG.
Opens.
【００１３】即ち、四方電磁弁２９はＤポートとＦポー
トとが、またＥポートとＧポートとが連通状態にあり、
三方弁２８の弁体２７は中間流路５側のｂポートを閉じ
ており、他方吸気調節弁３内のばね２６により第１弁体
１８は第１弁座１７に押付けられて吸込流路２を閉じて
おり、この状態で起動すると吸込流路２（Ｙ）と中間流
路５内の圧力は大気圧力より低い圧力になる。四方電磁
弁２９を介して吸込流路２（Ｙ）と第１室１２、および
吸込流路２（Ｘ）と第２室１３とが連通して同一圧力に
なっているため、第２室１３の圧力は大気圧力で、第１
室１２の圧力は大気圧力よりも低い圧力になり、この両
者の差圧とばね２６の力によって第１弁体１８は第１弁
座１７に密着した状態を保ち、吸込流路２を閉じ続け
る。この場合、吸込流路２（Ｙ）内を完全に真空状態に
して運転を続けることは第１，第２段圧縮機本体１，４
の吐出温度を異常上昇させ、好ましくないので、第１弁
体１８に形成した吸込孔３４から若干の空気を第１段圧
縮機本体１に吸込ませるようになっている。That is, in the four-way solenoid valve 29, the D port and the F port are in communication with each other, and the E port and the G port are in communication with each other.
The valve body 27 of the three-way valve 28 closes the b port on the side of the intermediate flow passage 5, while the spring 26 in the intake control valve 3 presses the first valve body 18 against the first valve seat 17 and the suction flow passage 2 Is closed, and when activated in this state, the pressure in the suction passage 2 (Y) and the intermediate passage 5 becomes lower than the atmospheric pressure. The suction passage 2 (Y) and the first chamber 12 and the suction passage 2 (X) and the second chamber 13 communicate with each other via the four-way solenoid valve 29, and the second chamber 13 has the same pressure. Pressure is atmospheric pressure,
The pressure in the chamber 12 becomes lower than the atmospheric pressure, and the pressure difference between the chamber 12 and the force of the spring 26 keeps the first valve body 18 in close contact with the first valve seat 17 and keeps the suction passage 2 closed. . In this case, it is necessary to keep the suction passage 2 (Y) completely in the vacuum state and continue the operation.
Since the discharge temperature is abnormally increased, which is not preferable, some air is sucked into the first-stage compressor body 1 through the suction hole 34 formed in the first valve body 18.
【００１４】そして、吸気量を吸気孔３４からの空気の
みとした、この無負荷運転状態において、第２段圧縮機
本体４から吐出され、放気流路１９，開口部２０、およ
び第３室１５を経由してサイレンサ２４から大気中に放
出する昇温した圧縮空気の一部を、バイパス流路３３よ
り中間冷却器６の入側に戻す乾燥運転を行うようにして
ある。この場合、第１段圧縮機本体１からの吐出圧力
は、−３５ｃｍＨｇ程度の負圧になっており、第１，第
２段圧縮機本体１，４共に、その吐出温度は１５０°Ｃ
程度の高温になっている。空気が正圧状態になれば、空
気中の水蒸気の凝縮点が降下し、凝縮水が発生し易くな
るが、本発明では、第１段圧縮機本体１の吐出側を負圧
状態、もしくは正圧状態であっても圧力レベルを極力下
げ、かつ温度を極力高レベルにすることで凝縮水の発生
を抑制するとともに、蒸発させ得るようにしてある。Then, in this no-load operation state in which the amount of intake air is only the air from the intake hole 34, the air is discharged from the second stage compressor body 4, and the discharge passage 19, the opening 20, and the third chamber 15 are discharged. A part of the heated compressed air discharged from the silencer 24 into the atmosphere via the air-conditioner is returned to the inlet side of the intercooler 6 through the bypass flow path 33 for a drying operation. In this case, the discharge pressure from the first stage compressor body 1 is a negative pressure of about -35 cmHg, and the discharge temperature of both the first and second stage compressor bodies 1 and 4 is 150 ° C.
It is about high temperature. When the air is in a positive pressure state, the condensation point of water vapor in the air is lowered and condensed water is easily generated. However, in the present invention, the discharge side of the first-stage compressor body 1 is in a negative pressure state or a positive pressure state. Even in a pressure state, the pressure level is lowered as much as possible and the temperature is set as high as possible to suppress the generation of condensed water and to evaporate the condensed water.
【００１５】上記無負荷運転，乾燥運転は、吐出温度ス
イッチＴ１，Ｔ２の検出温度のいずれかが、設定値まで
上昇したときに、圧縮機が停止するように図示しない電
気回路が設けられている。次に、無負荷運転のみ（乾燥
運転は行わない）を行った場合（運転I），本発明によ
る場合、即ち無負荷運転時に乾燥運転も同時に行った場
合（運転II）の各部の圧力，温度の比較結果を示すと以
下の通りとなり、本発明による場合には、凝縮水が蒸発
し易い状態となっている。 運転I 運転II 初期 終了時 ＰＳ２（ｃｍＨＧ） −３５ −１５ −１５ ＴＳ２（°Ｃ） ３０ ３０ ７０ ＴＤ１（°Ｃ） １５０ １５０ 上限値 ＴＤ２（°Ｃ） １５０ １５０ 上限値In the no-load operation and the dry operation, an electric circuit (not shown) is provided so that the compressor stops when one of the temperatures detected by the discharge temperature switches T1 and T2 rises to a set value. . Next, the pressure and temperature of each part when only the no-load operation is performed (the drying operation is not performed) (operation I), according to the present invention, that is, when the drying operation is also performed at the time of the no-load operation (operation II). The results of the comparison are as follows, and in the case of the present invention, the condensed water is in a state of being easily evaporated. Operation I Operation II Initial end PS2 (cmHG) -35 -15 -15 TS2 (° C) 30 30 70 TD1 (° C) 150 150 Upper limit TD2 (° C) 150 150 Upper limit
【００１６】ここで、ＰＳ２は第２段圧縮機本体４の吸
込圧力，ＴＳ２は第２段圧縮機本体４の吸込温度，ＴＤ
１は第１段圧縮機本体１の吐出温度，ＴＤ２は第２段圧
縮機本体１の吐出温度、上限値は２１０°Ｃを示してい
る。なお、上記実施例では、圧縮機本体を２段に直列配
置したものを示したが、本発明はこれに限るものでな
く、圧縮機本体を３段以上に配置した圧縮機も含むもの
である。また、本発明はスクリュ圧縮機に限定するもの
でなく、オイルフリータイプであればスクリュ式のもの
以外の圧縮機も含むものである。Here, PS2 is the suction pressure of the second-stage compressor body 4, TS2 is the suction temperature of the second-stage compressor body 4, and TD.
Reference numeral 1 indicates the discharge temperature of the first-stage compressor body 1, TD2 indicates the discharge temperature of the second-stage compressor body 1, and the upper limit value is 210 ° C. In the above embodiment, the compressor main body is arranged in two stages in series, but the present invention is not limited to this, and includes a compressor in which the compressor main body is arranged in three or more stages. The present invention is not limited to the screw compressor, and includes oil-free type compressors other than screw type compressors.
【００１７】[0017]
【発明の効果】以上の説明より明らかなように、本発明
によれば、２段以上に直列配置した圧縮機本体と、最終
段圧縮機本体の吐出流路に設けた逆止弁と、第１段圧縮
機本体の吸込流路を閉じ、最終段圧縮機本体と上記逆止
弁との間の吐出流路の一次側部分を大気連通状態とする
無負荷運転状態、および上記吸込流路を開き、上記一次
側部分を大気非連通状態とする負荷運転状態に切換え可
能に形成するとともに、上記吸込流路に設けた吸気調節
弁と、圧縮機本体間の中間流路に中間冷却器とを備えた
多段型オイルフリー圧縮機において、少なくとも第１段
圧縮機本体と第１，第２段圧縮機本体間の中間冷却器と
の間の中間流路の部分と、上記大気連通状態と上記大気
非連通状態とに切換える上記吸気調節弁内の空間とを開
閉弁を介して連通させるバイパス流路を設けるととも
に、上記無負荷運転状態への移行の際に、上記開閉弁を
開状態に移行可能に形成してある。As is apparent from the above description, according to the present invention, the compressor body arranged in series in two or more stages, the check valve provided in the discharge passage of the final stage compressor body, The suction passage of the main body of the first stage compressor is closed, and the primary side portion of the discharge passage between the main body of the final stage compressor and the check valve is in an atmosphere-free state, and the suction passage is Opened and formed so as to be switchable to a load operation state in which the primary side portion is in a state of not communicating with the atmosphere, an intake control valve provided in the suction flow passage, and an intercooler in an intermediate flow passage between the compressor bodies. In a multi-stage oil-free compressor provided, at least a portion of an intermediate flow path between the first-stage compressor body and an intermediate cooler between the first and second-stage compressor bodies, the atmosphere communication state, and the atmosphere. Communicates with the space inside the intake control valve, which is switched to the non-communication state, through an on-off valve. Provided with a bypass channel which, at the time of transition to the no-load operating state, are then transferable to form the on-off valve in the open state.
【００１８】このため、圧縮機の停止前に乾燥運転を容
易、かつ確実に行うことが可能となるとともに、最終段
圧縮機本体の昇温した吐出空気の一部を中間流路に導く
ようにしてあるため、長時間無負荷運転する必要もな
く、この結果圧縮機停止後、長時間経過しても、圧縮機
本体、特に２段目以降の圧縮機本体に錆が生じるのを防
止でき、煩わしい防錆処理も不要になるという効果を奏
する。Therefore, the drying operation can be performed easily and surely before the compressor is stopped, and a part of the heated air discharged from the final stage compressor body is guided to the intermediate passage. Therefore, it is not necessary to operate for no load for a long time, and as a result, even if a long time has passed after the compressor was stopped, it is possible to prevent rust from occurring in the compressor body, especially in the second and subsequent stages. This has the effect of eliminating the need for cumbersome rust-proofing.
【図１】 本発明に係る２段式オイルフリースクリュ圧
縮機の負荷運転状態を示す全体構成図である。FIG. 1 is an overall configuration diagram showing a load operating state of a two-stage oil-free screw compressor according to the present invention.
【図２】 本発明に係る２段式オイルフリースクリュ圧
縮機の無負荷運転状態を示す全体構成図である。FIG. 2 is an overall configuration diagram showing a no-load operation state of a two-stage oil-free screw compressor according to the present invention.
【図３】 従来の２段式オイルフリースクリュ圧縮機の
全体構成図である。FIG. 3 is an overall configuration diagram of a conventional two-stage oil-free screw compressor.
１ 第１段圧縮機本体 ２ 吸込流路 ３ 吸気調節弁 ４ 第２段圧縮機本体 ５ 中間流路 ６ 中間冷却器 ８ 吐出流路 ８ａ 一次側部分 ９ 逆止弁 ３２ 電磁弁 ３３ バイパス流路 1 1st-stage compressor main body 2 Suction flow path 3 Intake control valve 4 2nd-stage compressor main body 5 Intermediate flow path 6 Intercooler 8 Discharge flow path 8a Primary part 9 Check valve 32 Solenoid valve 33 Bypass flow path
Claims (1)
最終段圧縮機本体の吐出流路に設けた逆止弁と、第１段
圧縮機本体の吸込流路を閉じ、最終段圧縮機本体と上記
逆止弁との間の吐出流路の一次側部分を大気連通状態と
する無負荷運転状態、および上記吸込流路を開き、上記
一次側部分を大気非連通状態とする負荷運転状態に切換
え可能に形成するとともに、上記吸込流路に設けた吸気
調節弁と、圧縮機本体間の中間流路に中間冷却器とを備
えた多段型オイルフリー圧縮機において、少なくとも第
１段圧縮機本体と第１，第２段圧縮機本体間の中間冷却
器との間の中間流路の部分と、上記大気連通状態と上記
大気非連通状態とに切換える上記吸気調節弁内の空間と
を開閉弁を介して連通させるバイパス流路を設けるとと
もに、上記無負荷運転状態への移行の際に、上記開閉弁
を開状態に移行可能に形成したことを特徴とする多段型
オイルフリー圧縮機。1. A compressor body in which two or more stages are arranged in series,
The check valve provided in the discharge passage of the final stage compressor body and the suction passage of the first stage compressor body are closed, and the primary side of the discharge passage between the final stage compressor body and the check valve is closed. The intake air provided in the suction flow path is formed so as to be switchable to a no-load operation state in which a portion is in the atmosphere communication state and a load operation state in which the suction flow path is opened and the primary side portion is in the air non-communication state. A multi-stage oil-free compressor including a control valve and an intercooler in an intermediate flow path between the compressor bodies, wherein at least an intercooler between the first-stage compressor body and the first and second-stage compressor bodies The intermediate flow path portion between and, and a bypass flow path for communicating the space in the intake control valve for switching between the atmosphere communication state and the atmosphere non-communication state via an on-off valve, and the no load The above-mentioned on-off valve can be moved to the open state when shifting to the operating state. Multistage oil-free compressor, characterized in that formed on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15649192A JPH0742948B2 (en) | 1992-06-16 | 1992-06-16 | Multi-stage oil-free compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15649192A JPH0742948B2 (en) | 1992-06-16 | 1992-06-16 | Multi-stage oil-free compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH062677A true JPH062677A (en) | 1994-01-11 |
| JPH0742948B2 JPH0742948B2 (en) | 1995-05-15 |
Family
ID=15628920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15649192A Expired - Lifetime JPH0742948B2 (en) | 1992-06-16 | 1992-06-16 | Multi-stage oil-free compressor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0742948B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7214271B2 (en) | 2001-09-27 | 2007-05-08 | Shin-Etsu Handotai Co., Ltd. | Silicon single crystal wafer process apparatus, silicon single crystal wafer, and manufacturing method of silicon epitaxial wafer |
| JP2007266514A (en) * | 2006-03-30 | 2007-10-11 | V Technology Co Ltd | Workpiece delivery apparatus in working machine |
| CN106382760A (en) * | 2016-08-31 | 2017-02-08 | 广东美芝制冷设备有限公司 | Compressor and refrigerating system thereof |
-
1992
- 1992-06-16 JP JP15649192A patent/JPH0742948B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7214271B2 (en) | 2001-09-27 | 2007-05-08 | Shin-Etsu Handotai Co., Ltd. | Silicon single crystal wafer process apparatus, silicon single crystal wafer, and manufacturing method of silicon epitaxial wafer |
| JP2007266514A (en) * | 2006-03-30 | 2007-10-11 | V Technology Co Ltd | Workpiece delivery apparatus in working machine |
| CN106382760A (en) * | 2016-08-31 | 2017-02-08 | 广东美芝制冷设备有限公司 | Compressor and refrigerating system thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0742948B2 (en) | 1995-05-15 |
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