JP2011052628A - Molecular pump - Google Patents

Molecular pump Download PDF

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JP2011052628A
JP2011052628A JP2009203684A JP2009203684A JP2011052628A JP 2011052628 A JP2011052628 A JP 2011052628A JP 2009203684 A JP2009203684 A JP 2009203684A JP 2009203684 A JP2009203684 A JP 2009203684A JP 2011052628 A JP2011052628 A JP 2011052628A
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molecular pump
casing
pump
rotor
thread groove
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JP5483684B2 (en
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Masashi Iguchi
昌司 井口
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Osaka Vacuum Ltd
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Osaka Vacuum Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a molecular pump with a shielding function whose structure ensures a safety operation even in a powerful magnetic field, no-interference with a peripheral device, and no-trouble in fixing the molecular pump to a molecular pump body. <P>SOLUTION: A casing 6A surrounding the moving blade 2A of the rotor of a turbomolecular pump T and a casing 6B covering the outer portion of a screw groove pump S are formed of an integrated casing 6 composed of soft magnetic material. The lower portion of the casing 6 extends downwardly from the lower end of the pump body P. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、強い磁場内での真空排気に好適な分子ポンプに関する。   The present invention relates to a molecular pump suitable for evacuation in a strong magnetic field.

加速器や核融合装置等の強い磁場を発生する装置内で真空排気を行なう場合、排気を行なうターボ分子ポンプや複合分子ポンプは強い磁場に曝されることになる。   When evacuation is performed in a device that generates a strong magnetic field such as an accelerator or a fusion device, the turbo molecular pump or the complex molecular pump that performs evacuation is exposed to a strong magnetic field.

強い磁場内では、これら分子ポンプ内で高速回転するロータや回転軸に渦電流が発生して、回転に対するブレーキと発熱現象が生ずるため、運転が困難になるという問題があった。   In a strong magnetic field, eddy currents are generated in the rotor and rotating shaft that rotate at high speed in these molecular pumps, causing a brake and heat generation phenomenon against rotation, which makes operation difficult.

従来は、磁場中で分子ポンプを使う場合、分子ポンプの外側に鉄などの磁性材料の円筒を配置して磁気シールドとしていたが、該シールドが周辺機器と干渉したりして、その設置位置や分子ポンプ本体への固定手段に困難を生ずるなどの問題があった。   Conventionally, when a molecular pump is used in a magnetic field, a magnetic shield such as iron is placed outside the molecular pump to form a magnetic shield. There were problems such as difficulty in fixing means to the molecular pump body.

又、出願人は先に、筐体内に固定の固定部材内に回転部材を回転して気体を圧縮排気する式の真空ポンプにおいて、前記筐体及び固定部材の両方又はどちらか一方を磁性材により構成した真空ポンプの出願を行なった(特許文献1参照。)。   In addition, the applicant firstly, in the vacuum pump that compresses and exhausts the gas by rotating the rotating member in the fixed member fixed in the casing, the casing and / or the fixing member is made of a magnetic material. An application for a vacuum pump constructed was filed (see Patent Document 1).

図3に、従来の真空ポンプの一例の複合分子ポンプの斜視断面図を示した。 FIG. 3 is a perspective sectional view of a complex molecular pump as an example of a conventional vacuum pump.

複合分子ポンプは、上部のターボ分子ポンプ部と、その下に連設されたねじ溝ポンプ部とからなり、6aが吸気口、7aが排気口である。   The composite molecular pump is composed of an upper turbo molecular pump part and a thread groove pump part provided below the turbo molecular pump part. 6a is an intake port and 7a is an exhaust port.

又、2cがねじ溝ポンプ部のステータ、3cがターボ分子ポンプ部のスペーサであり、4aはポンプの筐体を示す。   Reference numeral 2c denotes a stator of the thread groove pump portion, 3c denotes a spacer of the turbo molecular pump portion, and 4a denotes a pump housing.

前記特許文献1の複合分子ポンプでは、これらステータ2cとスペーサ3cの固定部材、及び筐体4aの両方、又はどちらか一方を鉄系透磁性材料により形成するとしている。   In the composite molecular pump of Patent Document 1, both or either one of the fixing member of the stator 2c and the spacer 3c and the housing 4a are formed of an iron-based magnetic permeable material.

しかし、前記特許文献1の磁気シールドの構造では、強い磁場における対応が不充分であるという問題点があった。   However, the structure of the magnetic shield disclosed in Patent Document 1 has a problem in that it is insufficient to cope with a strong magnetic field.

特開平01−190991号公報Japanese Patent Laid-Open No. 01-190991

本発明は周辺機器と干渉する心配がなく、分子ポンプ本体への固定にも問題がなく、しかも分子ポンプの全長に渡って磁気シールドが完全に施された構造の強い磁場内での真空排気に好適な分子ポンプを提供することを目的とする。   In the present invention, there is no risk of interference with peripheral devices, there is no problem in fixing to the molecular pump body, and the magnetic pump is completely evacuated in a strong magnetic field over the entire length of the molecular pump. An object is to provide a suitable molecular pump.

本発明は上記の目的を達成すべく、ターボ分子ポンプ部ロータの下にねじ溝ポンプ部ロータを連設して回転体を形成した複合分子ポンプにおいて、前記ねじ溝ポンプ部ロータの外側にねじ溝ポンプ部ステータ又はねじ溝ポンプ部ケーシングを設け、前記ターボ分子ポンプ部ロータの外側には、飽和磁束密度及び透磁率の高い軟磁性材料からなるケーシングを設けると共に該ケーシングは前記ねじ溝ポンプ部ステータ又は前記ねじ溝ポンプ部ケーシングを囲んで下方に伸びて、前記回転体の下端部よりも下方にまで延長した。   In order to achieve the above object, the present invention provides a compound molecular pump in which a rotating body is formed by connecting a thread groove pump section rotor under a turbo molecular pump section rotor, and a thread groove is formed outside the thread groove pump section rotor. A pump part stator or a thread groove pump part casing is provided, and a casing made of a soft magnetic material having a high saturation magnetic flux density and a high permeability is provided outside the turbo molecular pump part rotor, and the casing is the thread groove pump part stator or The screw groove pump part casing was surrounded and extended downward, and extended below the lower end part of the rotating body.

本発明によれば、強い磁場内で運転を行なう分子ポンプにおいて、周辺機器と干渉する心配がなく、分子ポンプ本体への固定にも問題がなく、分子ポンプの全長に渡って磁気シールドが完全に施された構造の分子ポンプを提供できる効果を有する。   According to the present invention, in a molecular pump that operates in a strong magnetic field, there is no risk of interference with peripheral devices, there is no problem in fixing to the molecular pump body, and the magnetic shield is completely covered over the entire length of the molecular pump. This has the effect of providing a molecular pump having the applied structure.

本発明の分子ポンプの実施例1の縦断面図である。It is a longitudinal cross-sectional view of Example 1 of the molecular pump of the present invention. 本発明の分子ポンプの実施例2の縦断面図である。It is a longitudinal cross-sectional view of Example 2 of the molecular pump of the present invention. 従来の分子ポンプの一例の斜視断面図である。It is a perspective sectional view of an example of the conventional molecular pump.

本発明を実施するための形態の実施例を以下に示す。   The example of the form for carrying out the present invention is shown below.

本発明の分子ポンプの実施例1を図1により説明する。   Example 1 of the molecular pump of the present invention will be described with reference to FIG.

図1はターボ分子ポンプ部Tの下方にねじ溝ポンプ部Sを連設してなる本発明の複合分子ポンプ1の縦断面図である。   FIG. 1 is a longitudinal sectional view of a composite molecular pump 1 according to the present invention in which a thread groove pump portion S is continuously provided below a turbo molecular pump portion T. FIG.

2はアルミ合金からなるロータで、該ロータ2の上部にはターボ分子ポンプ部の動翼2Aが放射状に且つ多段に該ロータ2から外方へ突出して形成されている。   Reference numeral 2 denotes a rotor made of an aluminum alloy. On the rotor 2, rotor blades 2A of a turbo molecular pump portion are formed radially and projecting outward from the rotor 2 in multiple stages.

前記ロータ2の下部にはねじ溝ポンプ部ロータ2Bが円筒状に形成されている。   A thread groove pump portion rotor 2B is formed in a cylindrical shape below the rotor 2.

3は軸受筐体で、該軸受筐体3は前記ロータ2の軸中心に固定されている回転軸21を回動自在に軸支する軸受構造を内蔵すると共に、該回転軸21を回転駆動する電動モータを内蔵している。   Reference numeral 3 denotes a bearing housing. The bearing housing 3 has a built-in bearing structure that rotatably supports a rotating shaft 21 fixed at the shaft center of the rotor 2, and rotationally drives the rotating shaft 21. Built-in electric motor.

前記ロータ2及び回転軸21等が複合分子ポンプ1の回転体を形成している。   The rotor 2, the rotating shaft 21 and the like form a rotating body of the complex molecular pump 1.

4は複合分子ポンプ1のベース部で、前記軸受筐体3を固定している。   Reference numeral 4 denotes a base portion of the complex molecular pump 1 which fixes the bearing housing 3.

前記ベース部4の側方部には、当該複合分子ポンプ1の排気口4A及び電気配線や冷却水配管等の接続部を具備している。   The side portion of the base portion 4 includes an exhaust port 4A of the composite molecular pump 1 and connection portions such as electric wiring and cooling water piping.

5はねじ溝ポンプ部Sのステータで、前記ねじ溝ポンプ部ロータ2Bの外周面に近接して配置され、内周部にねじ溝5Aを有している。該ステータ5はアルミ合金等からなる。   Reference numeral 5 denotes a stator of the thread groove pump part S, which is disposed close to the outer peripheral surface of the thread groove pump part rotor 2B, and has a thread groove 5A on the inner peripheral part. The stator 5 is made of an aluminum alloy or the like.

6はケーシングで、けい素鋼又はパーマロイ等の鉄合金等の飽和磁性密度と透磁率の高い軟磁性材料に形成される。   A casing 6 is formed of a soft magnetic material having a high saturation magnetic density and high magnetic permeability, such as silicon steel or iron alloy such as permalloy.

前記ケーシング6は、内周部にリング状のスペーサT1を嵌着してターボ分子ポンプ部Tの殻部をなす上部ケーシング6Aと、ねじ溝ポンプ部ステータ5を覆う下部ケーシング6Bとからなる。   The casing 6 includes an upper casing 6 </ b> A that fits a ring-shaped spacer T <b> 1 on an inner peripheral portion thereof to form a shell portion of the turbo molecular pump portion T, and a lower casing 6 </ b> B that covers the thread groove pump portion stator 5.

尚、6Cは吸気口を示す。   Reference numeral 6C denotes an intake port.

本実施例では、下部ケーシング6Bを上部ケーシング6Aよりも大径に形成すると共に、上部ケーシング6Aから下部ケーシング6Bへ移行する段差部に前記ステータ5に設けたフランジ5Bを当接させて、ボルト6Dを用いて締結し、該ボルト6Dとフランジ5Bを介して、前記ステータ5と該ステータ5に固定の軸受筐体3と該軸受筐体3に回転自在に支持されている回転軸21と該回転軸21に固定のロータ2と前記ステータ5に固定のベース部4とからなるポンプ本体Pが前記ケーシング6に支持され、該ケーシング6の下部ケーシング6Bの下端部が前記ポンプ本体Pのベース部4より下方に延長形成されている。   In this embodiment, the lower casing 6B is formed to have a diameter larger than that of the upper casing 6A, and a flange 5B provided on the stator 5 is brought into contact with a stepped portion that transitions from the upper casing 6A to the lower casing 6B, whereby a bolt 6D. And the stator 5, the bearing housing 3 fixed to the stator 5, the rotary shaft 21 rotatably supported by the bearing housing 3, and the rotation via the bolt 6 </ b> D and the flange 5 </ b> B. A pump body P including a rotor 2 fixed to a shaft 21 and a base portion 4 fixed to the stator 5 is supported by the casing 6, and a lower end portion of a lower casing 6 B of the casing 6 is a base portion 4 of the pump body P. It is formed to extend further downward.

6Eは前記ケーシング6の下部ケーシング6Bの側壁部に設けられている開口部であり、該開口部6Eを前記排気口4A、冷却水配管及び電気配線等が挿通するようにした。   6E is an opening provided in the side wall portion of the lower casing 6B of the casing 6, and the exhaust port 4A, cooling water piping, electric wiring, and the like are inserted through the opening 6E.

次に本実施例の複合分子ポンプ1の使用法及びその効果について説明する。   Next, the usage and effects of the complex molecular pump 1 of the present embodiment will be described.

複合分子ポンプ1は、加速器や核融合装置等の強い磁場を発生する装置内の真空排気を行なうのに用いられる。   The complex molecular pump 1 is used to evacuate inside a device that generates a strong magnetic field such as an accelerator or a fusion device.

複合分子ポンプ1の主要部分であるポンプ本体Pのロータ2や回転軸の回転体は、該ポンプ本体Pのベース部4より下方まで延長形成されている軟磁性材料からなるケーシング6で周囲を囲まれているので、強い磁場内にあっても回転に対するブレーキ作用や発熱等の心配がなく、安全に分子ポンプの排気作業を行なうことができる。   The rotor 2 of the pump body P, which is the main part of the complex molecular pump 1, and the rotating body of the rotating shaft are surrounded by a casing 6 made of a soft magnetic material that extends downward from the base portion 4 of the pump body P. Therefore, the pumping operation of the molecular pump can be performed safely without worrying about braking action or heat generation even in a strong magnetic field.

尚、この実施例では、ケーシング6の下端部をポンプ本体Pのベース部4より下方に延長形成されている例を示したが、該ケーシング6の下端部をポンプ本体Pのロータ2や回転軸の回転体より少なくとも下方に位置すれば前述の作用が達成できる。   In this embodiment, the lower end portion of the casing 6 is formed to extend downward from the base portion 4 of the pump body P. However, the lower end portion of the casing 6 is connected to the rotor 2 and the rotary shaft of the pump body P. The above-described operation can be achieved if it is located at least below the rotating body.

本発明の分子ポンプの実施例2を図2により説明する。   Embodiment 2 of the molecular pump of the present invention will be described with reference to FIG.

図2は本実施例の複合分子ポンプ11の縦断面図である。   FIG. 2 is a longitudinal sectional view of the complex molecular pump 11 of the present embodiment.

複合分子ポンプ11は、前記実施例1の複合分子ポンプ1のケーシング6に、軟磁性材料の鉄合金からなる底板7を付設した点が前記複合分子ポンプ1とは異なる。   The composite molecular pump 11 is different from the composite molecular pump 1 in that a bottom plate 7 made of an iron alloy of a soft magnetic material is attached to the casing 6 of the composite molecular pump 1 of the first embodiment.

このように、ポンプ本体Pの下方部にも磁場に対するシールドを設置したことにより、強い磁場内での分子ポンプの対応能力が一層向上した。特に、磁場方向が分子ポンプの回転軸に対して直角でない場合、つまり回転軸方向の磁場成分のある場合にも対応能力が向上している。   As described above, by providing a shield against the magnetic field also in the lower part of the pump body P, the capability of the molecular pump in a strong magnetic field is further improved. In particular, when the magnetic field direction is not perpendicular to the rotation axis of the molecular pump, that is, when there is a magnetic field component in the rotation axis direction, the capability is improved.

尚、複合分子ポンプ1がより強い回転方向の磁場に曝される場合には、分子ポンプ1の吸気口6Cと被排気系との間に軟磁性材料からなる吸気管の短管(図示せず)を介在させてもよい。   When the composite molecular pump 1 is exposed to a stronger magnetic field in the rotational direction, a short pipe (not shown) of an intake pipe made of a soft magnetic material is provided between the intake port 6C of the molecular pump 1 and the exhausted system. ) May be interposed.

又、前記実施例は複合分子ポンプの場合を示したが、これはターボ分子ポンプのみからなるものであってもよい。   Moreover, although the said Example showed the case of the composite molecular pump, this may consist only of a turbo molecular pump.

本発明の分子ポンプは加速器や核融合装置等の強い磁場を発生する装置内の真空排気に用いられる。   The molecular pump of the present invention is used for evacuation in a device that generates a strong magnetic field such as an accelerator or a fusion device.

1、11 分子ポンプ(複合分子ポンプ)
2 ロータ
4 ベース部
5 ステータ(ねじ溝ポンプ部ステータ)
6 ケーシング
6E 開口部
7 底板
P ポンプ本体
S ねじ溝ポンプ部
T ターボ分子ポンプ部
1,11 Molecular pump (complex molecular pump)
2 Rotor 4 Base part 5 Stator (Thread groove pump part stator)
6 Casing 6E Opening 7 Bottom plate P Pump body S Thread groove pump part T Turbo molecular pump part

Claims (5)

ターボ分子ポンプ部ロータの下にねじ溝ポンプ部ロータを連設して回転体を形成した複合分子ポンプにおいて、前記ねじ溝ポンプ部ロータの外側にねじ溝ポンプ部ステータ又はねじ溝ポンプ部ケーシングを設け、前記ターボ分子ポンプ部ロータの外側には、飽和磁束密度及び透磁率の高い軟磁性材料からなるケーシングを設けると共に該ケーシングは前記ねじ溝ポンプ部ステータ又は前記ねじ溝ポンプ部ケーシングを囲んで下方に伸びて、前記回転体の下端部よりも下方にまで延長したことを特徴とする分子ポンプ。   In a composite molecular pump in which a thread groove pump section rotor is connected under a turbo molecular pump section rotor to form a rotating body, a thread groove pump section stator or a thread groove pump section casing is provided outside the thread groove pump section rotor. A casing made of a soft magnetic material having a high saturation magnetic flux density and high magnetic permeability is provided outside the turbo molecular pump rotor, and the casing surrounds the screw groove pump portion stator or the screw groove pump portion casing. A molecular pump characterized by extending and extending below a lower end of the rotating body. 前記分子ポンプは前記ねじ溝ポンプ部のロータの外側に設けたステータと前記ケーシングの内壁部とを連結した構造の請求項1に記載の分子ポンプ。   2. The molecular pump according to claim 1, wherein the molecular pump has a structure in which a stator provided outside a rotor of the thread groove pump portion is connected to an inner wall portion of the casing. 前記ケーシングの下端開口部を前記軟磁性材料で形成した底板により塞いだことを特徴とする請求項1又は請求項2に記載の分子ポンプ。   The molecular pump according to claim 1 or 2, wherein a lower end opening of the casing is closed with a bottom plate formed of the soft magnetic material. 前記ステータの下部に当該分子ポンプのベース部を連設すると共に、当該ベース部に連通する配管は、前記ケーシングの側壁部に設けられている開口部を挿通するように形成したことを特徴とする請求項1又は請求項2又は請求項3に記載の分子ポンプ。   A base portion of the molecular pump is continuously provided at a lower portion of the stator, and a pipe communicating with the base portion is formed so as to pass through an opening provided in a side wall portion of the casing. The molecular pump according to claim 1, claim 2, or claim 3. 前記分子ポンプの吸気口部に、飽和磁束密度と透磁率の高い軟磁性材料からなる吸気管の短管を接続して有する請求項1乃至請求項4のいずれか1に記載の分子ポンプ。   The molecular pump according to any one of claims 1 to 4, wherein a short pipe of an intake pipe made of a soft magnetic material having a high saturation magnetic flux density and high permeability is connected to an intake port portion of the molecular pump.
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WO2015118897A1 (en) * 2014-02-04 2015-08-13 エドワーズ株式会社 Vacuum pump
EP3034881A1 (en) * 2014-12-18 2016-06-22 Pfeiffer Vacuum GmbH Vacuum pump

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JP2001241393A (en) * 1999-12-21 2001-09-07 Seiko Seiki Co Ltd Vacuum pump
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015118897A1 (en) * 2014-02-04 2015-08-13 エドワーズ株式会社 Vacuum pump
US11009040B2 (en) 2014-02-04 2021-05-18 Edwards Japan Limited Vacuum pump
EP3034881A1 (en) * 2014-12-18 2016-06-22 Pfeiffer Vacuum GmbH Vacuum pump

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