JPH094579A - Multistage positive displacement vacuum pump - Google Patents
Multistage positive displacement vacuum pumpInfo
- Publication number
- JPH094579A JPH094579A JP11706996A JP11706996A JPH094579A JP H094579 A JPH094579 A JP H094579A JP 11706996 A JP11706996 A JP 11706996A JP 11706996 A JP11706996 A JP 11706996A JP H094579 A JPH094579 A JP H094579A
- Authority
- JP
- Japan
- Prior art keywords
- vacuum pump
- casing
- rotors
- pump
- stage
- 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
Links
Classifications
-
- 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
- F04C18/126—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 radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は多段容積式真空ポン
プに係り、特に半導体製造工程等に好適に使用され大気
圧から駆動することができる多段容積式真空ポンプに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage positive displacement vacuum pump, and more particularly to a multi-stage positive displacement vacuum pump that is suitable for use in semiconductor manufacturing processes and can be driven from atmospheric pressure.
【０００２】[0002]
【従来の技術】従来から、一対のロータが同期しながら
反対方向に回転して吸入排気を行うルーツ型スクリュー
型及びクロウ型真空ポンプと呼ばれる真空ポンプが知ら
れている。一対のロータは、ケーシング内面及びロータ
同士の間にわずかな隙間を保持して、非接触で逆方向に
回転する。この種の真空ポンプはロータを多段にするこ
とにより、吸込側では約１０-3Ｔｏｒｒ、排気側では大
気圧となるように設計されている。2. Description of the Related Art Conventionally, there has been known a vacuum pump called a roots screw type and a claw type vacuum pump in which a pair of rotors rotate in opposite directions in synchronization with each other to suck and exhaust. The pair of rotors rotate in opposite directions in a non-contact manner with a slight gap maintained between the inner surface of the casing and the rotors. This type of vacuum pump is designed so that the suction side has an atmospheric pressure of about 10 −3 Torr and the exhaust side has an atmospheric pressure by using multiple rotors.
【０００３】図８は従来のこの種の多段容積式真空ポン
プを示す要部断面図であり、ケーシングとポンプロータ
との関係を示す断面図である。また図９は図８のIX−IX
線断面図である。図８及び図９に示すように、一対のポ
ンプロータ（図８では一方のポンプロータのみ示す）２
１はケーシング２２に収容されており、ケーシング２２
の各段間部には円筒形の壁２２ｗが形成されている。図
８及び図９において、ある段の吸込口の圧力をＰ1 、吐
出口の圧力をＰ2 とし、次の段の吸込口の圧力をＰ2 、
吐出口の圧力をＰ3 とする。FIG. 8 is a cross-sectional view of a main part of a conventional multistage positive displacement vacuum pump of this type, showing a relationship between a casing and a pump rotor. Also, FIG. 9 shows IX-IX of FIG.
It is a line sectional view. As shown in FIGS. 8 and 9, a pair of pump rotors (only one pump rotor is shown in FIG. 8) 2
1 is accommodated in the casing 22, and the casing 22
A cylindrical wall 22w is formed in each step. 8 and 9, the pressure at the suction port of a certain stage is P 1 , the pressure at the discharge port is P 2, and the pressure of the suction port of the next stage is P 2 ,
The pressure at the discharge port is P 3 .
【０００４】[0004]
【発明が解決しようとする課題】この種の真空ポンプで
は、図８に示すように１つの段（ガス圧縮部）と次の段
の間のロータの軸部周囲には、Ｐ1 、Ｐ2、Ｐ3 という
３つの圧力が存在し、 Ｐ1 → Ｐ2 Ｐ1 ← Ｐ2 Ｐ2 → Ｐ3 Ｐ2 ← Ｐ3 Ｐ1 → Ｐ3 Ｐ1 ← Ｐ3 という６方向のガスの流れが存在した。本発明は上述の
事情に鑑みなされたもので、各段と次段との間における
上記６方向のガスの流れのうち最も圧力差の大きいＰ1
→Ｐ3 及びＰ1 ←Ｐ3 の流れを減少させることにより、
ポンプ性能を向上させることができる多段容積式真空ポ
ンプを提供することを目的とするものである。In this type of vacuum pump, as shown in FIG. 8, P 1 and P 2 are provided around the rotor shaft between one stage (gas compression part) and the next stage. , P 3 exist, and there are 6 directions of gas flow of P 1 → P 2 P 1 ← P 2 P 2 → P 3 P 2 ← P 3 P 1 → P 3 P 1 ← P 3. did. The present invention has been made in view of the above circumstances, and P 1 having the largest pressure difference among the gas flows in the above 6 directions between each stage and the next stage.
→ By reducing the flow of P 3 and P 1 ← P 3 ,
An object of the present invention is to provide a multi-stage positive displacement vacuum pump capable of improving pump performance.
【０００５】[0005]
【課題を解決するための手段】上述した目的を達成する
ため、本発明は対向して配置された一対の多段状のポン
プロータを同期回転させて排気を行う多段容積式真空ポ
ンプにおいて、各段から次段への段間部に中間圧力室を
有したケーシングを設け、該ケーシングに前記一対のポ
ンプロータを収容し、該ポンプロータの段間軸部周囲が
前記中間圧力室内に位置するようにしたことを特徴とす
るものである。In order to achieve the above-mentioned object, the present invention relates to a multi-stage positive displacement vacuum pump in which a pair of multi-stage pump rotors arranged facing each other are synchronously rotated to exhaust gas. A casing having an intermediate pressure chamber is provided in the interstage portion from the next stage to the next stage, and the pair of pump rotors is housed in the casing, and the periphery of the interstage shaft portion of the pump rotor is located in the intermediate pressure chamber. It is characterized by having done.
【０００６】本発明によれば、ケーシング段間部の円筒
形の壁をなくし、中間圧力室を設ける。つまり、ポンプ
ロータの段間軸部周囲を前の段の圧縮後から次の段の圧
縮前の圧力で覆うことで、最も圧力差の大きいガスの流
れを減少させることができる。そのため、真空ポンプの
到達真空度を向上させることができる。これにより、半
導体製造工程で使用されるプロセスガスによる真空ポン
プ内部での腐食、生成物析出に対して有効な窒素ガスに
よる希釈の量を増加させることができ、ポンプの長寿命
化に寄与する。また、上記ケーシングを上下二つ割りケ
ーシングとすることで、組立性を向上させ、生産の効率
向上に寄与する。According to the present invention, the cylindrical wall in the interstage portion of the casing is eliminated and the intermediate pressure chamber is provided. That is, by covering the periphery of the interstage shaft of the pump rotor with the pressure after the compression of the previous stage and before the compression of the next stage, the flow of gas having the largest pressure difference can be reduced. Therefore, the ultimate vacuum degree of the vacuum pump can be improved. As a result, the amount of corrosion by the process gas used in the semiconductor manufacturing process inside the vacuum pump and the amount of dilution by nitrogen gas effective for product precipitation can be increased, which contributes to a longer service life of the pump. Further, by using the above casing as an upper and lower halved casing, the assembling property is improved and the production efficiency is improved.
【０００７】[0007]
【実施例】以下、本発明に係る多段容積式真空ポンプの
一実施例を図面を参照して説明する。図１は本発明のル
ーツ型真空ポンプを示す断面図であり、図２のI−I線断
面図である。図２は図１のII−II線断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a multi-stage positive displacement vacuum pump according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a roots type vacuum pump of the present invention, and is a sectional view taken along line I-I of FIG. FIG. 2 is a sectional view taken along line II-II of FIG.
【０００８】図１および図２において、符号１はケーシ
ングであり、ケーシング１内に一対のポンプロータを構
成する多段状のルーツロータ２，２が配設されている。
各ルーツロータ２は両端部近傍で軸受３，３によって支
承されている。ルーツロータ２，２は２軸ブラシレス直
流モータＭによって回転駆動されるようになっている。
また、ケーシング１は、図２に示すように上下二つ割り
構造になっている。In FIG. 1 and FIG. 2, reference numeral 1 is a casing, and inside the casing 1, there are arranged multi-stage roots rotors 2 and 2 constituting a pair of pump rotors.
Each roots rotor 2 is supported by bearings 3 in the vicinity of both ends. The roots rotors 2 and 2 are driven to rotate by a biaxial brushless DC motor M.
Further, the casing 1 has an upper and lower split structure as shown in FIG.
【０００９】図３は図２のIII−III線断面図であり、図
４は図１のIV−IV断面図である。図２、図３および図４
は、ポンプ各断面における形状と圧力分布状況を示して
いる。即ち、ある段の吸込口の圧力がＰ1 、吐出口の圧
力がＰ2 、次の段の吸込口の圧力がＰ2 、吐出口の圧力
がＰ3 になっている状態が示されている。FIG. 3 is a sectional view taken along line III-III in FIG. 2, and FIG. 4 is a sectional view taken along line IV-IV in FIG. 2, 3 and 4
Shows the shape and pressure distribution in each cross section of the pump. That is, there is shown a state in which the pressure of the suction port of a certain stage is P 1 , the pressure of the discharge port is P 2 , the pressure of the suction port of the next stage is P 2 , and the pressure of the discharge port is P 3 . .
【００１０】図５はケーシングとルーツロータの段間部
を示す要部断面図である。図５に示すように、一対のル
ーツロータ（図５では一方のルーツロータのみ示す）
２，２を収容するケーシング１には、ロータ段間部の軸
２ａの周囲が圧力Ｐ2（前の段の圧縮後から次の段の圧
縮前の圧力）で覆われるように、ケーシングの段間部の
円筒形の壁をなくし、中間圧力室４を設けている。これ
により、Ｐ1 →Ｐ2 、Ｐ1 ←Ｐ2 、Ｐ2 →Ｐ3 及びＰ2
←Ｐ3 のガスの流れは存在するが、圧力差の最も大きい
Ｐ1 →Ｐ3 及びＰ1 ←Ｐ3 のガスの流れが減少し、真空
ポンプの各段の圧縮比が改善される。FIG. 5 is a sectional view of an essential part showing an interstage portion between the casing and the roots rotor. As shown in FIG. 5, a pair of roots rotors (only one roots rotor is shown in FIG. 5)
In the casing 1 for accommodating the rotors 2 and 2, the stages of the casing are covered so that the circumference of the shaft 2a in the rotor interstage portion is covered with the pressure P 2 (pressure after compression of the previous stage to pressure before compression of the next stage). The intermediate pressure chamber 4 is provided by eliminating the cylindrical wall in the intermediate portion. As a result, P 1 → P 2 , P 1 ← P 2 , P 2 → P 3 and P 2
Although the gas flow of ← P 3 exists, the gas flow of P 1 → P 3 and P 1 ← P 3 having the largest pressure difference is reduced, and the compression ratio of each stage of the vacuum pump is improved.
【００１１】図６は、２軸ブラシレス直流モータＭの詳
細を示す図であり、図１のVI−VI線断面図である。図１
および図６に示されるように、ルーツロータ２，２の主
軸端２ａ，２ａには、モータロータ５Ａ，５Ｂが固定さ
れている。即ち、モータロータ５Ａ，５Ｂは真空ポンプ
の吸込側の主軸端２ａ，２ａに固定されている。２つの
モータロータ５Ａ，５Ｂは、それぞれ２ｎ極（ｎは整
数）の永久磁石５ａ，５ｂを軸芯に対称に等間隔で磁束
がラジアル方向に発生するように周設している。FIG. 6 is a view showing the details of the two-axis brushless DC motor M and is a sectional view taken along line VI-VI of FIG. FIG.
As shown in FIG. 6 and FIG. 6, motor rotors 5A and 5B are fixed to the spindle ends 2a and 2a of the roots rotors 2 and 2, respectively. That is, the motor rotors 5A and 5B are fixed to the suction-side main shaft ends 2a and 2a of the vacuum pump. The two motor rotors 5A and 5B are respectively provided with permanent magnets 5a and 5b each having 2n poles (n is an integer) so as to be symmetrical about the axis and to generate magnetic flux in the radial direction at equal intervals.
【００１２】また、図１および図６に示すように、モー
タロータ５Ａ，５Ｂの外周側には耐食性の良好な材料ま
たは樹脂からなるキャン７，７を介して１個のモータス
テータ６が配設されている。キャン７，７はモータロー
タ５Ａ，５Ｂの外周および片側の端面を覆っており、こ
れらキャン７，７により真空ポンプのポンプ部を密封し
ている。また、キャン７の内面およびモータロータ５
Ａ，５Ｂの外面は黒色になっている。モータステータ６
は、図１および図５に示すように、ウォータジャケット
９ａを具備した水冷のモータフレーム９と、積層された
ケイ素鋼板からなるモータステータコア６ａと、巻線８
ａ，８ｂとから構成されている。Further, as shown in FIGS. 1 and 6, one motor stator 6 is arranged on the outer peripheral side of the motor rotors 5A and 5B via cans 7 and 7 made of a material or resin having good corrosion resistance. ing. The cans 7, 7 cover the outer peripheries of the motor rotors 5A, 5B and one end surface, and the cans 7, 7 seal the pump portion of the vacuum pump. Also, the inner surface of the can 7 and the motor rotor 5
The outer surfaces of A and 5B are black. Motor stator 6
As shown in FIGS. 1 and 5, a water-cooled motor frame 9 having a water jacket 9a, a motor stator core 6a made of laminated silicon steel plates, and a winding 8 are provided.
a and 8b.
【００１３】モータステータコア６ａには、それぞれ６
枚の磁極歯Ｕ〜Ｚ，Ｕ１〜Ｚ１が円周等配に形成されて
いる。そして、磁極歯Ｕ〜Ｚ，Ｕ１〜Ｚ１には、両モー
タロータ５Ａ，５Ｂの軸線の中心面Ｃにおいて対称かつ
反対の磁極となるように巻線８ａ，８ｂがそれぞれ装着
されており、巻線８ｂは巻線８ａと反対巻きとなってい
る。前記水冷モータフレーム９に密着するとともにモー
タステータコア６ａ、巻線８ａ，８ｂおよびキャン７，
７の外面の全てを覆うようにゴムまたは樹脂等のモール
ド材１２が設けられている。また図１に示すようにモー
タフレーム９にはモータドライバ１０が固定されてい
る。The motor stator core 6a has 6
The magnetic pole teeth U to Z and U1 to Z1 are formed at equal intervals on the circumference. The magnetic pole teeth U to Z and U1 to Z1 are respectively provided with windings 8a and 8b so as to have symmetrical and opposite magnetic poles on the center plane C of the axes of the motor rotors 5A and 5B. Is opposite to the winding 8a. The motor stator core 6a, the windings 8a, 8b, and the can 7, while closely contacting the water-cooled motor frame 9,
A molding material 12 such as rubber or resin is provided so as to cover the entire outer surface of 7. Further, as shown in FIG. 1, a motor driver 10 is fixed to the motor frame 9.
【００１４】一方、ルーツロータ２，２の反モータ側の
軸端には、互いに噛み合う一対のタイミングギヤ１１，
１１（図１では一方のギヤのみ示す）が固定されてお
り、突発的な外部要因による一対のルーツロータ２，２
の同期のずれを防ぐようになっている。On the other hand, a pair of timing gears 11, which mesh with each other, are provided on the shaft ends of the roots rotors 2, 2 on the side opposite to the motor.
11 (only one gear is shown in FIG. 1) is fixed, and a pair of roots rotors 2 and 2 due to a sudden external factor.
It is designed to prevent the synchronization of the.
【００１５】次に、前述のように構成された真空ポンプ
の作用を説明する。２軸ブラシレス直流モータＭのコイ
ル８ａ，８ｂにモータドライバ１０を介して通電する
と、モータステータコア６ａにはモータロータ５Ａ，５
Ｂをそれぞれ反転して回転させる空間移動磁界が形成さ
れる。一方、モータロータ５Ａ，５Ｂのそれぞれ永久磁
石５ａ，５ｂにより発生する磁界は、モータステータコ
ア６ａによって磁路が各モータロータ５Ａ，５Ｂ間で形
成され閉じるように構成されている。したがって、一対
のモータロータ５Ａ，５Ｂには、異磁極面で磁気カップ
リング作用が働き，必ず同期して相互に反対側に回転す
る。Next, the operation of the vacuum pump configured as described above will be described. When the coils 8a, 8b of the two-axis brushless DC motor M are energized via the motor driver 10, the motor rotors 5A, 5 are attached to the motor stator core 6a.
A spatially moving magnetic field is formed which inverts and rotates each B. On the other hand, the magnetic fields generated by the permanent magnets 5a and 5b of the motor rotors 5A and 5B are configured so that a magnetic path is formed between the motor rotors 5A and 5B and closed by the motor stator core 6a. Therefore, the pair of motor rotors 5A and 5B are magnetically coupled to each other on the surfaces of different magnetic poles and always rotate in opposite directions in synchronization with each other.
【００１６】モータロータ５Ａ，５Ｂの回転により、一
対のルーツロータ２，２は同期回転する。図７は一対の
ルーツロータ２，２の動作を説明する図であり、一対の
ルーツロータ２，２は、ケーシング１の内面及びロータ
２，２同士の間にわずかな隙間を保持して、非接触で逆
方向に回転する。一対のルーツロータ２，２が位相１か
ら位相４まで回転するにつれて、吸込側気体はロータ２
とケーシング１間に閉じ込められて吐出側に移送され
る。３葉ロータでは、１つのルーツロータで３ヶ所谷部
があるため、ポンプ１回転あたり６回排気されることに
なる。The rotation of the motor rotors 5A and 5B causes the pair of roots rotors 2 and 2 to rotate synchronously. FIG. 7 is a diagram for explaining the operation of the pair of roots rotors 2 and 2. The pair of roots rotors 2 and 2 hold a slight gap between the inner surface of the casing 1 and the rotors 2 and 2 in a non-contact manner. Rotate in the opposite direction. As the pair of roots rotors 2 and 2 rotate from phase 1 to phase 4, the suction side gas becomes
It is trapped between the casing 1 and the casing 1 and transferred to the discharge side. In the three-leaf rotor, one roots rotor has three troughs, and therefore the pump is exhausted six times per revolution.
【００１７】本発明においては、上記排気動作の際に、
ロータ段間部の軸２ａの周囲が圧力Ｐ2（前の段の圧縮
後から次の段の圧縮前の圧力）で覆われるように、ケー
シング１の段間部の円筒形の壁をなくし、中間圧力室４
を設けている。これにより、Ｐ1 →Ｐ2 、Ｐ1 ←Ｐ2 、
Ｐ2 →Ｐ3 及びＰ2 ←Ｐ3 のガスの流れは存在するが、
圧力差の最も大きいＰ1 →Ｐ3 及びＰ1 ←Ｐ3 のガスの
流れが減少し、真空ポンプの各段の圧縮比が改善され
る。そのため、真空ポンプによる到達真空度が向上す
る。In the present invention, during the exhaust operation,
The cylindrical wall in the interstage part of the casing 1 is eliminated so that the circumference of the shaft 2a in the interstage part of the rotor is covered with the pressure P 2 (pressure after compression of the previous stage to before compression of the next stage). Intermediate pressure chamber 4
Is provided. As a result, P 1 → P 2 , P 1 ← P 2 ,
Although there is a gas flow of P 2 → P 3 and P 2 ← P 3 ,
The gas flow of P 1 → P 3 and P 1 ← P 3 having the largest pressure difference is reduced, and the compression ratio of each stage of the vacuum pump is improved. Therefore, the ultimate vacuum achieved by the vacuum pump is improved.
【００１８】なお、図１乃至図７に示す実施例において
は、ルーツロータの駆動源として２軸ブラシレス直流モ
ータを使用した例を説明したが、通常のモータを使用し
ても良いことは云うまでもない。In the embodiments shown in FIGS. 1 to 7, an example in which a two-axis brushless DC motor is used as a drive source for the roots rotor has been described, but it goes without saying that a normal motor may be used. Absent.
【００１９】[0019]
【発明の効果】以上説明したように本発明によれば、ケ
ーシング段間部の円筒形の壁をなくし、中間圧力室を設
けることで真空ポンプの到達真空度を向上させることが
できる。これにより、半導体製造工程で使用されるプロ
セスガスによる真空ポンプ内部での腐食、生成物析出に
対して有効な窒素ガスによる希釈の量を増加させること
ができ、ポンプの長寿命化に寄与する。また、本発明に
よれば、上記ケーシングを上下二つ割りケーシングとす
ることで、組立性を向上させ、生産の効率向上に寄与す
る。As described above, according to the present invention, the ultimate vacuum degree of the vacuum pump can be improved by eliminating the cylindrical wall in the casing interstage portion and providing the intermediate pressure chamber. As a result, the amount of corrosion by the process gas used in the semiconductor manufacturing process inside the vacuum pump and the amount of dilution by nitrogen gas effective for product precipitation can be increased, which contributes to a longer service life of the pump. Further, according to the present invention, the casing is divided into upper and lower halves, which improves the assemblability and contributes to the improvement of production efficiency.
【図１】本発明に係る多段容積式真空ポンプの一実施例
を示す断面図である。FIG. 1 is a sectional view showing an embodiment of a multi-stage positive displacement vacuum pump according to the present invention.
【図２】図１のII−II線断面図である。FIG. 2 is a sectional view taken along line II-II of FIG.
【図３】図２のIII−III線断面図である。3 is a sectional view taken along line III-III in FIG.
【図４】図１のIV−IV線断面図である。4 is a sectional view taken along line IV-IV in FIG.
【図５】図１の要部拡大断面図である。FIG. 5 is an enlarged sectional view of a main part of FIG.
【図６】図１のVI−VI線断面図である。FIG. 6 is a sectional view taken along line VI-VI of FIG. 1;
【図７】図１におけるルーツロータの動作説明図であ
る。FIG. 7 is an operation explanatory view of the roots rotor in FIG.
【図８】従来の多段容積式真空ポンプを示す要部断面図
である。FIG. 8 is a cross-sectional view of essential parts showing a conventional multi-stage positive displacement vacuum pump.
【図９】図９は図８のIX−IX線断面図である。9 is a sectional view taken along line IX-IX in FIG.
１ ケーシング ２ ルーツロータ ３ 軸受 ４ 中間圧力室 ５Ａ，５Ｂ モータロータ ５ａ，５ｂ 永久磁石 ６ モータステータ ６ａ モータステータコア ７ 樹脂キャン ８ａ，８ｂ 巻線 ９ モータフレーム １０ モータドライバ １１ タイミングギヤ １２ モールド材 1 Casing 2 Roots rotor 3 Bearing 4 Intermediate pressure chamber 5A, 5B Motor rotor 5a, 5b Permanent magnet 6 Motor stator 6a Motor stator core 7 Resin can 8a, 8b Winding 9 Motor frame 10 Motor driver 11 Timing gear 12 Mold material
Claims (2)
プロータを同期回転させて排気を行う多段容積式真空ポ
ンプにおいて、各段から次段への段間部に中間圧力室を
有したケーシングを設け、該ケーシングに前記一対のポ
ンプロータを収容し、該ポンプロータの段間軸部周囲が
前記中間圧力室内に位置するようにしたことを特徴とす
る多段容積式真空ポンプ。1. A multi-stage positive displacement vacuum pump in which a pair of multi-stage pump rotors arranged to face each other are synchronously rotated to perform exhaust, and an intermediate pressure chamber is provided in an interstage portion from each stage to the next stage. A multistage positive-displacement vacuum pump comprising a casing, the pair of pump rotors being housed in the casing, and a periphery of an interstage shaft portion of the pump rotor being located in the intermediate pressure chamber.
ることを特徴とする請求項１記載の多段容積式真空ポン
プ。2. The multi-stage positive displacement vacuum pump according to claim 1, wherein the casing has an upper and lower split structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11706996A JP3497661B2 (en) | 1995-04-19 | 1996-04-15 | Multi-stage positive displacement vacuum pump |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7-117928 | 1995-04-19 | ||
| JP11792895 | 1995-04-19 | ||
| JP11706996A JP3497661B2 (en) | 1995-04-19 | 1996-04-15 | Multi-stage positive displacement vacuum pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH094579A true JPH094579A (en) | 1997-01-07 |
| JP3497661B2 JP3497661B2 (en) | 2004-02-16 |
Family
ID=26455255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11706996A Expired - Lifetime JP3497661B2 (en) | 1995-04-19 | 1996-04-15 | Multi-stage positive displacement vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3497661B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1643129A1 (en) * | 2004-10-01 | 2006-04-05 | LOT Vacuum Co., Ltd. | Composite dry vacuum pump having roots rotor and screw rotor |
| EP1882856A1 (en) * | 2006-07-28 | 2008-01-30 | LOT Vacuum Co., Ltd. | Complex dry vacuum pump having Roots and screw rotors |
| CN100465450C (en) * | 2004-10-01 | 2009-03-04 | LOTVacuum株式会社 | Composite dry vacuum pump having roots rotor and screw rotor |
-
1996
- 1996-04-15 JP JP11706996A patent/JP3497661B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1643129A1 (en) * | 2004-10-01 | 2006-04-05 | LOT Vacuum Co., Ltd. | Composite dry vacuum pump having roots rotor and screw rotor |
| CN100465450C (en) * | 2004-10-01 | 2009-03-04 | LOTVacuum株式会社 | Composite dry vacuum pump having roots rotor and screw rotor |
| US7722332B2 (en) | 2004-10-01 | 2010-05-25 | Lot Vacuum Co., Ltd. | Composite dry vacuum pump having roots rotor and screw rotor |
| EP1882856A1 (en) * | 2006-07-28 | 2008-01-30 | LOT Vacuum Co., Ltd. | Complex dry vacuum pump having Roots and screw rotors |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3497661B2 (en) | 2004-02-16 |
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