JPS6223597A - Turbomolecular pump - Google Patents

Turbomolecular pump

Info

Publication number
JPS6223597A
JPS6223597A JP16355085A JP16355085A JPS6223597A JP S6223597 A JPS6223597 A JP S6223597A JP 16355085 A JP16355085 A JP 16355085A JP 16355085 A JP16355085 A JP 16355085A JP S6223597 A JPS6223597 A JP S6223597A
Authority
JP
Japan
Prior art keywords
gas
bearings
gas turbine
drive shaft
radial
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.)
Granted
Application number
JP16355085A
Other languages
Japanese (ja)
Other versions
JPH066956B2 (en
Inventor
Nobuyoshi Nakaishi
中石 信義
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP16355085A priority Critical patent/JPH066956B2/en
Publication of JPS6223597A publication Critical patent/JPS6223597A/en
Publication of JPH066956B2 publication Critical patent/JPH066956B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To prevent vibration by installing a gas turbine blade part having the equal outside diameter to that of a driving shaft and installing appair of radial gas bearings into a casing so as to interpose the gas turbine blade part. CONSTITUTION:Radial gas bearings 3 and 4 are installed into a casing 2, and a gas turine 6 is arranged so as to be interposed between the both bearings 3 and 4. Said gas turbine 6 is constituted of a blade part 6a formed onto the periphery of a driving shaft 1a and a gas injection nozzle 6b for jetting the driving gas. Therefore, generation of vibration can be suppressed, and the over- load phenomenon of the gas bearings can be eliminated.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はターボ分子ポンプに関するものである0 〔従来の技術〕 従来のこの種ターボ分子ポンプを第4図に基づいて説明
する。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a turbo-molecular pump. [Prior Art] A conventional turbo-molecular pump of this type will be explained based on FIG.

図において、1は回転体であり、その駆動軸1aの下端
にはガスタービンブレード6が結合されている。3,4
はケーシング2に配設されたラジアル方向のガスベアリ
ングであシ、ガス導入口3a、4aから入ったガスが多
孔質ノズルから噴出するようになっている。5はケーシ
ング2に配設されたスラスト方向のガスベアリングであ
る。7はガスベアリング部と吐出側真空室8の間をシー
ルするシール部材である。
In the figure, 1 is a rotating body, and a gas turbine blade 6 is coupled to the lower end of a drive shaft 1a. 3,4
is a radial gas bearing disposed in the casing 2, so that the gas entering through the gas inlet ports 3a, 4a is ejected from the porous nozzle. 5 is a gas bearing in the thrust direction disposed in the casing 2. 7 is a sealing member that seals between the gas bearing section and the discharge side vacuum chamber 8.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかして上記した従来のものでは、ガスタービンが1 
ラジアル方向のガスベアリング3.及び4に対してオー
バハングの形になっているため、ガスベアリング4のラ
ジアル反力が過大となシ、適正な軸受性能を得ることが
できなくなるという問題点があった。又、ガスベアリン
グは、駆動軸1aとの間に微少々間隙を構成して成るた
め通常は9分割型にできない。このため。
However, in the conventional system described above, the gas turbine is
Radial gas bearing 3. and 4, the radial reaction force of the gas bearing 4 becomes excessive, making it impossible to obtain proper bearing performance. Further, the gas bearing cannot normally be made into a nine-part type because it has a slight gap between it and the drive shaft 1a. For this reason.

タービンブレード6と回転体1とは分割して生産し、ネ
ジ結合などの手段により、結合して回転体1を構成する
こととなり、振動の再現性などの面から好ましくないと
いう問題点があった。
The turbine blades 6 and the rotating body 1 are produced separately and then combined to form the rotating body 1 by means such as screw coupling, which is undesirable from the viewpoint of vibration reproducibility. .

〔問題点全解決するための手段〕[Means to solve all problems]

本発明は上記した従来の問題点に鑑みてなされたもので
9分子ポンプの駆動軸にその外径とほぼ同じ外径を有す
るガスタービンブレード部を配設し、同ブレード部を挾
むように一対のラジアルガスベアリングをケーシングに
配設してなるものである。
The present invention has been made in view of the above-mentioned conventional problems, and includes a gas turbine blade section having an outer diameter approximately the same as that of the drive shaft of a nine-molecular pump, and a pair of gas turbine blades arranged to sandwich the blade section. It consists of a radial gas bearing placed in a casing.

〔作用〕[Effect]

上記したように構成された本発明によれば。 According to the present invention configured as described above.

一対のラジアルガスベアリングで荷重を均等に支持する
ことができ、ひいては分子ポンプの駆動軸を確実に支承
させることができるものである。
The pair of radial gas bearings can support the load evenly, and in turn, the drive shaft of the molecular pump can be supported reliably.

〔実施例〕〔Example〕

以下1本発明の実施例を第1図及び第2図に基づいて説
明する。
An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

図において、1は回転体で、laは同回転体1の、駆動
軸である。
In the figure, 1 is a rotating body, and la is a drive shaft of the rotating body 1.

2は、該駆動軸1aを囲繞するケーシングで。2 is a casing surrounding the drive shaft 1a.

3.4は該ケーシング2に配設されたラジアルガスベア
リングで、夫々ガス供給孔3a、4aを有する多孔質金
属から形成されている。
A radial gas bearing 3.4 is disposed in the casing 2 and is made of porous metal having gas supply holes 3a and 4a, respectively.

7はラジアルガスベアリング3側と吐出側真空室8との
間をシールするシール部材である。
7 is a sealing member that seals between the radial gas bearing 3 side and the discharge side vacuum chamber 8.

そして、6は上記両ラジアルガスベアリング3.4間に
挾まれるように配置されたガスタービンで、同ガスター
ビン6ば、上記駆動軸1aの周囲にエンドミル等で直接
機械加工して形成したブレード部6aと、同ブレード部
6aに、不動ガスを噴射させるガス噴射ノズル6bとか
らなっている。
Reference numeral 6 denotes a gas turbine disposed between the two radial gas bearings 3.4, and the gas turbine 6 has blades formed by direct machining with an end mill or the like around the drive shaft 1a. It consists of a part 6a and a gas injection nozzle 6b that injects immobile gas to the blade part 6a.

尚、ガスタービン6は出力との関係で多段に設けでも勿
論可能、であり、このときにはラジアルガスベアリング
3,4も複数設けられるものである。
Incidentally, it is of course possible to provide the gas turbine 6 in multiple stages depending on the output, and in this case, a plurality of radial gas bearings 3 and 4 are also provided.

5はスラスト方向の荷重を回転自在に支持する球で、同
球5は潤滑油中に漬けたシ、当接部分に固体潤滑材を使
用したりして形成している。
Reference numeral 5 denotes a ball that rotatably supports a load in the thrust direction, and the ball 5 is formed by immersing it in lubricating oil or by using a solid lubricant at its abutting portion.

このように構成された実施例によれば、ガスタービンブ
レード部6aを駆動軸と一体に構成しているので組立型
回転体にみられる振動の発生は確実に抑制でき1回転体
のオーバハング部もなく全体構造も簡単なものであり又
同ブレード部6aはラジアルガスベアリング3.4に挾
まれるように配置しているので、該ガスベアリング3,
4への荷重は均分化され過負荷現象に伴なう軸受性能の
低下は未然かつ確実に防止できるものである。
According to the embodiment configured in this manner, since the gas turbine blade portion 6a is configured integrally with the drive shaft, the occurrence of vibrations observed in assembled rotary bodies can be reliably suppressed, and overhanging portions of one rotary body can also be suppressed. The overall structure is simple, and since the blade portion 6a is arranged to be sandwiched between the radial gas bearings 3.4, the gas bearings 3,
The load on the bearings 4 is evenly distributed, and deterioration in bearing performance due to overload phenomena can be prevented in advance and reliably.

そして第3図は他の実施例を示すもので、同実施例は上
記した実施例の下部のスラスト荷重?受ける球5に代え
て動圧型球面軸受15を採用し、潤滑油9内に位置する
ようにしているもので、他の構成は上記した実施例と同
一であり。
FIG. 3 shows another embodiment, which is a lower thrust load of the above-mentioned embodiment. A hydrodynamic spherical bearing 15 is used in place of the receiving ball 5, and is positioned within the lubricating oil 9, and the other configurations are the same as in the above-described embodiment.

同一部分には同一符号を付し詳細な説明は省略する。Identical parts are designated by the same reference numerals and detailed explanations will be omitted.

尚、上記した各実施例において9回転体1の重量が軽い
場合、ターボ分子ポンプ吸込側8と。
In each of the above-described embodiments, if the weight of the rotating body 1 is light, the suction side 8 of the turbo molecular pump.

ガスベアリング3.4等を設けた側との圧力差により1
回転体1がスラスト方向に不安定になることがあるが、
このような場合にはガスタービン6におけるガス噴射ノ
ズル6bからのガス噴射方向を下方に向けることにより
1回転体1に回転力を与えると同時に2回転体1の自重
と同方向に荷重を与えて、安定化させることができる。
1 due to the pressure difference with the side where the gas bearing 3.4 etc. is installed.
The rotating body 1 may become unstable in the thrust direction, but
In such a case, by directing the gas injection direction from the gas injection nozzle 6b in the gas turbine 6 downward, rotational force is applied to the first rotating body 1, and at the same time, a load is applied in the same direction as the own weight of the second rotating body 1. , can be stabilized.

又、さらに積極的には第4図で示すように。Moreover, as shown in FIG. 4, more actively.

回転体1の駆動軸1aに段付部10を設けて。A stepped portion 10 is provided on the drive shaft 1a of the rotating body 1.

この段付部10に対して矢印11で示す方向にガスを噴
射させることにより更に回転体1を安定支持することが
可能である。
By injecting gas in the direction shown by the arrow 11 to the stepped portion 10, it is possible to further stably support the rotating body 1.

〔発明の効果〕〔Effect of the invention〕

以上1本発明によれば振動の発生やガスベアリングの過
負荷現象の発生がなくなり、軸受性能を一段と向上させ
ることができるものであり。
According to the present invention, vibrations and gas bearing overload phenomena are eliminated, and bearing performance can be further improved.

ひいては分子ポンプの安定運転が得られると共に分子ポ
ンプ自体の寿命を一段と向上させることができる等の種
々の秀れた効果?奏しうるものである。
Furthermore, various excellent effects such as stable operation of the molecular pump can be obtained and the life of the molecular pump itself can be further improved. It is something that can be played.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の実施例を示す要部説明図。 第2図は第1(¥1の■−■断面図、第3図は本発明の
他の実施例を示す要部説明図、第4図は本発明の更に他
の実施例を示す要部説明図、第5図は従来の分子ポンプ
を示す要部説明図である。 1a・・・、駆動Q++、  3.  lI・・ラジア
ルガスベアリング、6・ガスタービン、6a・・−ガス
タービンブレード部、6b・・ガス噴射ノズル 、・を人 、ル受、間  猜′ 毛1閃 垢?閤
FIG. 1 is an explanatory diagram of main parts showing an embodiment of the present invention. Fig. 2 is a sectional view taken along the line ■-■ of 1 (¥1), Fig. 3 is an explanatory diagram of main parts showing another embodiment of the present invention, and Fig. 4 is a main part showing still another embodiment of the present invention. Explanatory diagram, FIG. 5 is an explanatory diagram of main parts showing a conventional molecular pump. 1a..., drive Q++, 3. lI... radial gas bearing, 6... gas turbine, 6a...-gas turbine blade section , 6b...gas injection nozzle,... person, le holder, between 猜′ hair 1 scintillation?

Claims (1)

【特許請求の範囲】[Claims] 駆動軸にその外径とほぼ同じ外径を有するガスタービン
ブレード部を配設すると共に、該駆動軸を囲繞するケー
シングに同駆動軸の軸線と平行方向で上記ガスタービン
ブレード部を挾むように少くとも一対のラジアルガスベ
アリングを配設してなることを特徴とするターボ分子ポ
ンプ。
A gas turbine blade portion having an outer diameter substantially the same as the outer diameter of the drive shaft is disposed on the drive shaft, and at least a casing surrounding the drive shaft is configured to sandwich the gas turbine blade portion in a direction parallel to the axis of the drive shaft. A turbo molecular pump characterized by a pair of radial gas bearings.
JP16355085A 1985-07-24 1985-07-24 Turbo molecular pump Expired - Lifetime JPH066956B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16355085A JPH066956B2 (en) 1985-07-24 1985-07-24 Turbo molecular pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16355085A JPH066956B2 (en) 1985-07-24 1985-07-24 Turbo molecular pump

Publications (2)

Publication Number Publication Date
JPS6223597A true JPS6223597A (en) 1987-01-31
JPH066956B2 JPH066956B2 (en) 1994-01-26

Family

ID=15776026

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16355085A Expired - Lifetime JPH066956B2 (en) 1985-07-24 1985-07-24 Turbo molecular pump

Country Status (1)

Country Link
JP (1) JPH066956B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63200697U (en) * 1987-06-16 1988-12-23
JPH01187396A (en) * 1988-01-22 1989-07-26 Hitachi Ltd Vacuum pump
CN110159596A (en) * 2019-04-25 2019-08-23 浙江理工大学 The axially adjustable cylinder of circumferential direction with the bionical guide vane of adjustable angle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63200697U (en) * 1987-06-16 1988-12-23
JPH01187396A (en) * 1988-01-22 1989-07-26 Hitachi Ltd Vacuum pump
CN110159596A (en) * 2019-04-25 2019-08-23 浙江理工大学 The axially adjustable cylinder of circumferential direction with the bionical guide vane of adjustable angle
CN110159596B (en) * 2019-04-25 2023-11-28 浙江理工大学 Circumferential and axial adjustable cylinder with angle adjustable bionic guide vanes

Also Published As

Publication number Publication date
JPH066956B2 (en) 1994-01-26

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