JPH03550Y2 - - Google Patents
Info
- Publication number
- JPH03550Y2 JPH03550Y2 JP1985028851U JP2885185U JPH03550Y2 JP H03550 Y2 JPH03550 Y2 JP H03550Y2 JP 1985028851 U JP1985028851 U JP 1985028851U JP 2885185 U JP2885185 U JP 2885185U JP H03550 Y2 JPH03550 Y2 JP H03550Y2
- Authority
- JP
- Japan
- Prior art keywords
- sealing device
- shaft sealing
- oil
- rotor
- labyrinth
- 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.)
- Expired
Links
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、オイルフリースクリユ圧縮機の軸封
装置に関するものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a shaft sealing device for an oil-free screw compressor.
（従来の技術とその問題点）
従来のオイルフリースクリユ圧縮機において
は、一般に、ロータ軸の両端部を注油式軸受装置
で支持するとともに、ロータ側にシールリング等
の第１軸封装置を設け、これに続いてラビリンス
からなる第２軸封装置を設ける一方、第２軸封装
置と軸受装置との間を大気に連通する油排出室を
設けた構成とし、前記軸受装置からの潤滑油を油
排出室を介して機外に排出するようになつてい
る。(Prior art and its problems) In a conventional oil-free screw compressor, generally both ends of the rotor shaft are supported by oil-lubricated bearing devices, and a first shaft sealing device such as a seal ring is installed on the rotor side. This is followed by a second shaft sealing device consisting of a labyrinth, and an oil discharge chamber that communicates with the atmosphere between the second shaft sealing device and the bearing device, so that lubricating oil from the bearing device can be removed. The oil is discharged outside the machine through the oil discharge chamber.
そして、この種のスクリユ圧縮機においては、
アンロード運転時等において、１段圧縮機の吸込
側は−700mmＨｇまで低下し、その際、前記潤滑
油がラビリンスを介してロータ室に吸引されるの
を防止するために、少なくとも吸込側の前記第１
軸封装置を第１大気連通部を介して大気に連通
し、大なる負圧が発生したとき、大気を吸引する
ようになつている。 In this type of screw compressor,
During unload operation, etc., the suction side of the first stage compressor drops to -700 mmHg, and at that time, in order to prevent the lubricating oil from being sucked into the rotor chamber via the labyrinth, at least the 1st
The shaft seal device is communicated with the atmosphere through the first atmosphere communication portion, and when a large negative pressure is generated, the atmosphere is sucked in.
しかしながら、前記従来のものでは、どうして
もラビリンス内にも負圧が作用し、極めて若干で
はあるがロータ室に潤滑油が吸引されるという問
題があつた。 However, in the conventional type, negative pressure inevitably acts within the labyrinth, and a very small amount of lubricating oil is sucked into the rotor chamber.
（問題点を解決すべき手段）
本考案は、前記オイルフリースクリユ圧縮機の
軸封装置における前記問題点を解決するために、
少なくとも吸込側の第２軸封装置の一部に第２大
気連通部を設け、もし、ラビリンス内に若干の負
圧がかかつても、第２大気連通部からの空気の流
入により負圧を解消し、潤滑油のロータ室への流
入を完全に防止したものである。(Means to Solve the Problems) In order to solve the problems in the shaft sealing device of the oil-free screw compressor, the present invention provides the following:
A second atmospheric communication part is provided in at least a part of the second shaft sealing device on the suction side, and even if a slight negative pressure builds up in the labyrinth, the negative pressure will be eliminated by the inflow of air from the second atmospheric communication part. This completely prevents lubricating oil from flowing into the rotor chamber.
（実施例）
つぎに、本考案を一実施例である図面にしたが
つて説明する。(Example) Next, the present invention will be explained with reference to the drawings which are one example.
第１図、第２図において、１は雌ロータ、３は
前記雌ロータ１とかみ合う雄ロータ、６はロータ
ケーシング５の端部に取り付けられた軸受ケーシ
ングである。そして、前記両ロータ１，３のロー
タ軸２，４は、前記軸受ケーシング６に取り付け
られた軸受装置であるベアリング７で支持される
一方、軸受ケーシング６の前記ロータ側から、ス
テンレス製シールリング９とスペーサ１０とから
なる第１軸封装置８と、内面にラビリンス１３を
有する第２軸封装置１２が設けられている。 In FIGS. 1 and 2, 1 is a female rotor, 3 is a male rotor that meshes with the female rotor 1, and 6 is a bearing casing attached to the end of the rotor casing 5. The rotor shafts 2 and 4 of both the rotors 1 and 3 are supported by a bearing 7 which is a bearing device attached to the bearing casing 6, and a stainless steel seal ring 9 is inserted from the rotor side of the bearing casing 6. and a spacer 10, and a second shaft sealing device 12 having a labyrinth 13 on its inner surface.
また、前記第２軸封装置１２と軸受装置７との
間にはスペーサ１７によつて油排出室１８が設け
てある。そして、各ロータ軸２，４の油排出室１
８は図示しない通路により油排出孔１９に連通し
ている。さらに、前記第１軸封装置８のシールボ
ツクス１１は第１大気連通部２０により大気に連
通してある。なお、２１は前記軸受ケーシング６
に取り付けられた軸受押さえであり、前記軸受装
置７に向かつて開口するノズル２２から潤滑油が
噴射するようになつている。２４は駆動用ギヤ、
２５はロータ冷却用油通路で、図示しない配管に
より循環する従来公知のものである。 Further, an oil discharge chamber 18 is provided between the second shaft sealing device 12 and the bearing device 7 by a spacer 17. And the oil discharge chamber 1 of each rotor shaft 2, 4
8 communicates with the oil drain hole 19 through a passage (not shown). Further, the seal box 11 of the first shaft sealing device 8 is communicated with the atmosphere through a first atmosphere communication portion 20. Note that 21 is the bearing casing 6
The lubricating oil is injected from a nozzle 22 that opens toward the bearing device 7. 24 is a driving gear,
Reference numeral 25 denotes a rotor cooling oil passage, which is conventionally known and circulates through piping (not shown).
図面では、吸込側のみを示したが、吐出側にも
前記同様構成の軸封装置および軸受装置を備えて
いる。 In the drawings, only the suction side is shown, but the discharge side is also provided with a shaft sealing device and a bearing device having the same configuration as described above.
ところで、本考案における吸込側の第２軸封装
置１２は、第２図に示すように、軸封装置本体中
央内外周面に、たとえば、互いに孔１６で連通し
た環状溝部１４，１５が設けられ、かつ、両溝部
１５は図示しない通路により連通するとともに、
第２大気連通部２３に連通した構成となつてい
る。 By the way, as shown in FIG. 2, the second shaft sealing device 12 on the suction side of the present invention is provided with, for example, annular grooves 14 and 15 that communicate with each other through a hole 16 on the inner and outer peripheral surfaces of the center of the shaft sealing device main body. , and both groove portions 15 communicate with each other through a passage (not shown),
It is configured to communicate with the second atmospheric communication section 23.
前記構成からなるため、ロータ室Ｒの吸込側が
アンロード運転時に、たとえば、−700mmＨｇと圧
力低下すると、第１軸封装置８も低圧になり、第
１大気連通部２０から空気が流入する。この時、
場合によつては、第２軸封装置１２にも負圧が作
用し、ラビリンス１３内の潤滑油がロータ室Ｒ側
に吸引されることがあるが、この場合、第２大気
連通部２３から大気が流入し、ラビリンス１３内
の潤滑油がロータ室側に流入することは完全に防
止される。 Due to the above configuration, when the pressure on the suction side of the rotor chamber R decreases to, for example, -700 mmHg during unloading operation, the first shaft sealing device 8 also becomes low pressure, and air flows in from the first atmospheric communication part 20. At this time,
In some cases, negative pressure may also act on the second shaft sealing device 12, and the lubricating oil in the labyrinth 13 may be sucked into the rotor chamber R side. The atmosphere is completely prevented from flowing in, and the lubricating oil in the labyrinth 13 is completely prevented from flowing into the rotor chamber.
なお、前記第２軸封装置１２に設けるラビリン
ス１３は、ロータ駆動時にラビリンス１３内への
潤滑油流入を防止するねじ状のものであつてもよ
く、また、環状溝部１４よりロータ室側には図示
するように、ラビリンス１３を必ずしも設ける必
要はない。 The labyrinth 13 provided in the second shaft sealing device 12 may be thread-shaped to prevent lubricating oil from flowing into the labyrinth 13 when the rotor is driven. As illustrated, the labyrinth 13 does not necessarily need to be provided.
さらに、前記実施例では、ロータの負圧発生側
である吸込側の軸封装置について述べたが、吐出
側の軸封装置については第２大気連通部を設ける
必要がない。ただし、多段式圧縮機においては、
上流側に位置する圧縮機の吐出側にも負圧が生じ
るため、この場合においては、吐出側および吸込
側の第２軸封装置を前記のようにすることが望ま
しい。 Further, in the above embodiment, the shaft sealing device on the suction side, which is the negative pressure generation side of the rotor, has been described, but the shaft sealing device on the discharge side does not need to be provided with the second atmospheric communication part. However, in multistage compressors,
Since negative pressure also occurs on the discharge side of the compressor located on the upstream side, in this case, it is desirable that the second shaft sealing devices on the discharge side and suction side are configured as described above.
（考案の効果）
以上の説明で明らかなように、本考案によれ
ば、オイルフリースクリユ圧縮機の軸封装置を、
２組の軸封装置とし、第１、第２軸封装置をそれ
ぞれ大気に連通するようにしたため、第１軸封装
置にかかる負圧によつて軸受装置の潤滑油がロー
タ室へ侵入することは完全に防止できる。(Effects of the invention) As is clear from the above explanation, according to the present invention, the shaft sealing device of an oil-free screw compressor,
Since there are two sets of shaft sealing devices, and the first and second shaft sealing devices are each communicated with the atmosphere, the lubricating oil of the bearing device will not enter the rotor chamber due to the negative pressure applied to the first shaft sealing device. is completely preventable.
第１図は本考案の軸封装置を装着したオイルフ
リースクリユ圧縮機の要部断面図で、第２図は第
１、第２軸封装置部分の拡大断面図である。
１……雌ロータ、２，４……ロータ軸、３……
雄ロータ、７……軸受装置、８……第１軸封装
置、１２……第２軸封装置、１３……ラビリン
ス、１４，１５……環状溝部、１６……孔、１８
……油排出室、２０……第１大気連通部、２２…
…ノズル、２３……第２大気連通部。
FIG. 1 is a sectional view of a main part of an oil-free screw compressor equipped with a shaft sealing device of the present invention, and FIG. 2 is an enlarged sectional view of the first and second shaft sealing devices. 1... Female rotor, 2, 4... Rotor shaft, 3...
Male rotor, 7... Bearing device, 8... First shaft sealing device, 12... Second shaft sealing device, 13... Labyrinth, 14, 15... Annular groove, 16... Hole, 18
...Oil discharge chamber, 20...First atmosphere communication section, 22...
...Nozzle, 23...Second atmospheric communication section.
Claims (1)
室の吸込側とロータ軸の注油式軸受装置との間
に、前記吸込側から、第１大気連通部を有する
第１軸封装置と、内面にラビリンスを備え、前
記第１軸封装置側に第２大気連通部を有する第
２軸封装置と、この第２軸封装置と前記軸受装
置との間に、軸受装置からの潤滑油を大気に連
通する油排出室とを設けたことを特徴とするオ
イルフリースクリユ圧縮機の軸封装置。 (2) 前記ラビリンスが、ロータの回転によりラビ
リンス内流体が軸受装置側に流動するように作
用するものであることを特徴とする前記実用新
案登録請求の範囲第１項に記載のオイルフリー
スクリユ圧縮機の軸封装置。 (3) 前記第２軸封装置の第２大気連通部より吸込
側にラビリンスが設けられていないことを特徴
とする前記実用新案登録請求の範囲第１項また
は第２項に記載のオイルフリースクリユ圧縮機
の軸封装置。 (4) 前記ラビリンスが、第２軸封装置の全長にわ
たつて設けてあることを特徴とする前記実用新
案登録請求の範囲第１項または第２項に記載の
オイルフリースクリユ圧縮機の軸封装置。[Claims for Utility Model Registration] (1) At least on the suction side of the rotor, between the suction side of the rotor chamber and the oil-lubricated bearing device of the rotor shaft, a first atmosphere communication portion is provided from the suction side to the rotor shaft. a shaft sealing device, a second shaft sealing device having a labyrinth on its inner surface and a second atmospheric communication portion on the first shaft sealing device side, and a bearing device between the second shaft sealing device and the bearing device. A shaft sealing device for an oil-free screw compressor, characterized in that it is provided with an oil discharge chamber that communicates lubricating oil from the compressor to the atmosphere. (2) The oil-free screwdriver according to claim 1, wherein the labyrinth acts so that the fluid in the labyrinth flows toward the bearing device due to rotation of the rotor. Compressor shaft sealing device. (3) The oil-free screen according to claim 1 or 2, characterized in that a labyrinth is not provided on the suction side of the second atmospheric communication part of the second shaft sealing device. Shaft sealing device for Yu compressor. (4) The shaft of the oil-free screw compressor according to claim 1 or 2, wherein the labyrinth is provided over the entire length of the second shaft sealing device. Sealing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985028851U JPH03550Y2 (en) | 1985-02-27 | 1985-02-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985028851U JPH03550Y2 (en) | 1985-02-27 | 1985-02-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61144289U JPS61144289U (en) | 1986-09-05 |
| JPH03550Y2 true JPH03550Y2 (en) | 1991-01-10 |
Family
ID=30527119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985028851U Expired JPH03550Y2 (en) | 1985-02-27 | 1985-02-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03550Y2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6190293B2 (en) * | 2014-03-10 | 2017-08-30 | 株式会社神戸製鋼所 | Oil-free screw compressor |
| JP6469549B2 (en) * | 2014-09-29 | 2019-02-13 | 株式会社神戸製鋼所 | Oil-free screw compressor |
| JP6467324B2 (en) * | 2015-09-29 | 2019-02-13 | 株式会社神戸製鋼所 | Screw compressor |
| JP6710072B2 (en) | 2016-03-25 | 2020-06-17 | 株式会社神戸製鋼所 | Oil-free screw compressor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58193997A (en) * | 1982-05-07 | 1983-11-11 | Hitachi Ltd | Oil throwing apparatus for fluid machine |
-
1985
- 1985-02-27 JP JP1985028851U patent/JPH03550Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61144289U (en) | 1986-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0144914B2 (en) | ||
| US4781553A (en) | Screw vacuum pump with lubricated bearings and a plurality of shaft sealing means | |
| US4797068A (en) | Vacuum evacuation system | |
| JPS62243982A (en) | 2-stage vacuum pump and operating method thereof | |
| US4990069A (en) | Multi-stage roots vacuum pump with sealing module | |
| JP4072811B2 (en) | Shaft seal device for oil-free screw compressor | |
| US4639199A (en) | Two-shaft vacuum pump with internal compression | |
| JP2008514865A (en) | Screw compressor seal | |
| US6969242B2 (en) | Compressor | |
| JPH03550Y2 (en) | ||
| EP0126477B1 (en) | Rotor-shaft bearing apparatus for movable vane compressors | |
| JP2807820B2 (en) | Oil-free screw vacuum pump | |
| WO2003036089A1 (en) | Enclosed mechanical booster | |
| JPS6217389A (en) | Machine pump | |
| JPS59500572A (en) | Sealed compressor | |
| JPS62210282A (en) | Shift seal device of oil-free fluid machine | |
| JPS61283781A (en) | Multistage type vacuum pump | |
| US2438104A (en) | Pump | |
| JP2007263122A (en) | Vacuum exhaust device | |
| JPH03242489A (en) | Oilless screw type fluid machine | |
| JPS641501Y2 (en) | ||
| JP2007298043A (en) | Vacuum exhaust device | |
| JP4638582B2 (en) | Shaft seal structure of oil-free screw compressor | |
| JPS62197685A (en) | Shaft seal device of screw vacuum pump | |
| CN223482898U (en) | A sealing structure of a screw blower |