JP2600957B2 - Centrifuge exhaust structure - Google Patents
Centrifuge exhaust structureInfo
- Publication number
- JP2600957B2 JP2600957B2 JP2059095A JP5909590A JP2600957B2 JP 2600957 B2 JP2600957 B2 JP 2600957B2 JP 2059095 A JP2059095 A JP 2059095A JP 5909590 A JP5909590 A JP 5909590A JP 2600957 B2 JP2600957 B2 JP 2600957B2
- Authority
- JP
- Japan
- Prior art keywords
- chamber
- oil
- exhaust
- rotation
- air
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B15/00—Other accessories for centrifuges
- B04B15/08—Other accessories for centrifuges for ventilating or producing a vacuum in the centrifuge
Landscapes
- Applications Or Details Of Rotary Compressors (AREA)
- Centrifugal Separators (AREA)
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は試料を内蔵したロータを配置する回転室内を
減圧するための排気装置を有する遠心機の排気構造に関
するものである。Description: FIELD OF THE INVENTION The present invention relates to an exhaust structure of a centrifuge having an exhaust device for reducing the pressure in a rotating chamber in which a rotor containing a sample is arranged.
従来、遠心機は駆動装置により毎分数万回転以上もの
高速で回転されるロータ３の風損を低減するため、ロー
タ３の配置される回転室２内を排気装置で減圧すること
が知られている。なお、回転室２と回転軸11の周囲31と
駆動装置室内が連続した空間となっているため、回転室
２内を減圧すると共に駆動装置８内も同時に減圧し、高
周波モータ16の風損を低減し、かつ、発熱を抑える構造
となっている。Conventionally, it has been known that a centrifuge is depressurized by an exhaust device in a rotation chamber 2 in which the rotor 3 is disposed in order to reduce windage loss of the rotor 3 which is rotated at a high speed of tens of thousands of rotations or more by a driving device. ing. Since the rotation chamber 2, the periphery 31 of the rotation shaft 11 and the drive chamber are continuous spaces, the interior of the rotation chamber 2 is decompressed and the interior of the drive unit 8 is simultaneously depressurized to reduce windage of the high-frequency motor 16. It has a structure that reduces heat and suppresses heat generation.
特に前記した駆動装置８内を減圧するために空気を排
気する経路は、第３図に矢印で示したように軸受14を通
り回転室２を経て油拡散真空ポンプ６、油回転真空ポン
プ７で機外に排出される構造となっている。In particular, a path for exhausting air to depressurize the inside of the driving device 8 passes through the bearing 14 as shown by an arrow in FIG. 3, passes through the rotating chamber 2, and is spread by the oil diffusion vacuum pump 6 and the oil rotary vacuum pump 7. It is structured to be discharged outside the machine.
しかし、前記駆動装置８内の高周波モータ16の駆動軸
28を支持する上部軸受14と下部軸受17を潤滑するための
油が軸受14、17に付着しており、また、駆動装置８内に
はオイルのミストが浮遊するため、減圧の際、空気と共
に回転室２内にわずかではあるがオイルが流入し、回転
室２を汚す場合があった。However, the driving shaft of the high-frequency motor 16 in the driving device 8
Oil for lubricating the upper bearing 14 and the lower bearing 17 supporting the 28 adheres to the bearings 14 and 17, and the mist of the oil floats in the drive unit 8. Although a small amount of oil flows into the rotating chamber 2, the rotating chamber 2 may be contaminated.
また、前記したオイルの流入を減じる目的で第４図に
示すバイパス穴29を軸受14近傍に設け、減圧の際、空気
が軸受14内を通らないようにすることが米国特許第4205
779号明細書等に開示されているが、駆動装置８内の空
気は回転室２を経て機外に排気させるため、駆動装置８
内のオイルミストがバイパス穴29を通って回転室２内に
流入する場合があり、十分ではなかった。In order to reduce the inflow of oil, a bypass hole 29 shown in FIG. 4 is provided in the vicinity of the bearing 14 to prevent air from passing through the bearing 14 during decompression.
As disclosed in the specification of Japanese Patent No. 779, etc., the air in the drive unit 8 is exhausted to the outside through the rotating chamber 2, so that the drive unit 8
In some cases, the oil mist inside may flow into the rotating chamber 2 through the bypass hole 29, which is not sufficient.
本発明の目的は、上記した従来技術の欠点をなくし、
この種の遠心機の回転室が駆動装置内のオイルで汚され
ないようにすることである。The object of the present invention is to eliminate the above-mentioned disadvantages of the prior art,
An object of the present invention is to prevent a rotating chamber of such a centrifuge from being contaminated with oil in a driving device.
本発明は、回転室と駆動装置の間の空気の流れを従来
と逆にすれば駆動装置内のオイルは回転室内に流入しな
いことに着目し、回転室内を減圧する際に、回転室と駆
動装置の間に存在する回転軸の周囲での空気が前記回転
室内から前記駆動装置側に向かって流れるようにしたも
のである。The present invention focuses on the fact that the oil in the driving device does not flow into the rotating chamber if the flow of air between the rotating chamber and the driving device is reversed, and when depressurizing the rotating chamber, the driving Air around a rotation shaft existing between the devices flows from the rotation chamber toward the drive device.
本発明の一実施例になる遠心機の排気構造を第１図
に、第１図Ａ部の拡大図を第２図に示す。FIG. 1 shows an exhaust structure of a centrifuge according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a portion A in FIG.
分離する試料４を挿入したロータ３は、排気装置とな
る油回転真空ポンプ７及び油拡散真空ポンプ６によって
１×10-3Torr程度に減圧された回転室２の中で、回転軸
11により高速に回転される。The rotor 3 into which the sample 4 to be separated is inserted is rotated by the rotating shaft 2 in the rotating chamber 2 which is reduced to about 1 × 10 −3 Torr by an oil rotary vacuum pump 7 and an oil diffusion vacuum pump 6 serving as an exhaust device.
11 is rotated at high speed.
回転軸11は高周波モータ16の駆動軸28に結合されてお
り、駆動軸28は２個の軸受（上部軸受14,下部軸受17）
で支持されている。上部軸受14は、オイルインレット18
より遠心力で吸い上げられたオイル19がＶ溝27、オイル
放出穴26を通り、その一部が上部軸受14に吹きつけられ
ることで潤滑される（本方式は例えば米国特許第276608
1号明細書等に記載されている）。また、下部軸受17
は、吸い上げられたオイル19がハウジング21a内を通り
再びオイルタンク20に戻る内の一部が流入することによ
り潤滑される。The rotating shaft 11 is connected to a driving shaft 28 of the high-frequency motor 16, and the driving shaft 28 has two bearings (an upper bearing 14 and a lower bearing 17).
Supported by. The upper bearing 14 is provided with an oil inlet 18
The oil 19 sucked up by centrifugal force passes through the V-groove 27 and the oil discharge hole 26, and a part of the oil 19 is lubricated by being blown to the upper bearing 14 (this method is described, for example, in US Pat. No. 276608).
No. 1 etc.). Also, the lower bearing 17
Is lubricated by a part of the sucked oil 19 passing through the housing 21a and returning to the oil tank 20 again.
このオイルタンク20に戻るオイル19の内、下部軸受を
通過しない余分なオイルはオイル戻り穴22を通り、下部
軸受17に対するオイルの過剰供給を防止している。Of the oil 19 returning to the oil tank 20, excess oil that does not pass through the lower bearing passes through the oil return hole 22 to prevent excessive supply of oil to the lower bearing 17.
ハウジング21aにはニップル24を介してホース25が取
り付けられており、そのホース25は油拡散真空ポンプ６
近傍と結ばれている。ホース25の内径および長さはシャ
フトケース23aの内の空気の通路31より排気抵抗が小さ
くなるよう定められている。A hose 25 is attached to the housing 21a via a nipple 24, and the hose 25 is connected to the oil diffusion vacuum pump 6.
It is connected to the neighborhood. The inner diameter and length of the hose 25 are determined so that the exhaust resistance is smaller than that of the air passage 31 in the shaft case 23a.
上記した構造でロータ３を回転するため、油回転真空
ポンプ７及び油拡散真空ポンプ６を作動させると、駆動
装置８すなわちハウジング21a内の空気は、シャフトケ
ース23aの内の空気の通路31より排気抵抗が小さいホー
ス25を通して排気される。When the oil rotary vacuum pump 7 and the oil diffusion vacuum pump 6 are operated to rotate the rotor 3 with the above-described structure, the air in the drive device 8, that is, the housing 21a is exhausted from the air passage 31 in the shaft case 23a. The air is exhausted through a hose 25 having a small resistance.
一方、上記軸受14の上側にある軸受室13の空気も、通
路31よりホース25の方が排気抵抗が小さいことから、上
部軸受14を通過し、ホース25より排気される。On the other hand, the air in the bearing chamber 13 above the bearing 14 also passes through the upper bearing 14 and is exhausted from the hose 25 since the hose 25 has a smaller exhaust resistance than the passage 31.
このため、軸受室13の圧力は通路31の圧力より低くな
り、結果として通路31の空気が軸受室13に流れ込み、ホ
ース25より排出される。さらに、通路31は回転室２と通
じていることから通路31の空気が排出されると通路31と
駆動装置８の回転室内開口部近傍、即ちロータ３の下部
空間の圧力は通路31の方が低くなるから、結果として回
転室２から通路31に空気が流れ、流れ込んだ空気はホー
ス25より排出される。For this reason, the pressure in the bearing chamber 13 becomes lower than the pressure in the passage 31, and as a result, the air in the passage 31 flows into the bearing chamber 13 and is discharged from the hose 25. Further, since the passage 31 communicates with the rotation chamber 2, when the air in the passage 31 is exhausted, the pressure in the passage 31 and the vicinity of the opening of the rotation chamber of the driving device 8, that is, the pressure in the lower space of the rotor 3 is lower in the passage 31. As a result, the air flows from the rotating chamber 2 to the passage 31, and the inflowing air is discharged from the hose 25.
すなわち、回転室２と駆動装置８の間に連通して存在
する回転軸11の周囲空間（通路31）での空気は、気圧の
高い方から低い方に、即ち回転室２側から前記駆動装置
８側に向かって流れるようになるので、駆動装置８内の
空気が回転室２内に流入することがなくなり、結果とし
て駆動装置８内のオイルで回転室２内を汚す心配がな
い。That is, the air in the space (passage 31) around the rotating shaft 11 that is in communication between the rotating chamber 2 and the driving device 8 flows from the higher pressure to the lower pressure, that is, from the rotating chamber 2 side to the driving device. Since the air flows toward the rotation chamber 8, the air in the driving device 8 does not flow into the rotating chamber 2, and as a result, there is no fear that the oil in the driving device 8 stains the rotation chamber 2.
なお、駆動装置を真空引きする排気装置は排気装置
は、回転室を減圧するものとは別に設けても同様の効果
が得られることは自明である。It is obvious that the same effect can be obtained even if the exhaust device for evacuating the drive device is provided separately from the exhaust device for reducing the pressure in the rotation chamber.
本発明によれば、駆動装置内の空気を排気する際、回
転室から駆動装置側に向って空気が流れるようにできる
ので、回転室内をオイルのミストで汚す心配を無くすこ
とができる。ADVANTAGE OF THE INVENTION According to this invention, when exhausting the air in a drive device, since air can be made to flow toward a drive device side from a rotation chamber, the danger of polluting a rotation room with oil mist can be eliminated.
第１図は本発明になる遠心機の排気構造の一実施例を示
す縦断面図、第２図は第１図Ａ部の拡大図、第３図は従
来の遠心機の排気構造を示す縦断面図、第４図は他の従
来の遠心機の排気構造を示す縦断面図である。 図において、２は回転室、３はロータ、４は試料、６は
油拡散真空ポンプ、７は油回転真空ポンプ、８は駆動装
置、11は回転軸、13は軸受室、14は上部軸受、15は固定
子、16は高周波モータ、17は下部軸受、18はオイルイン
レット、19はオイル、20はオイルタンク、21a、21bはハ
ウジング、22はオイル戻り穴、23a、23bはシャフトケー
ス、24はニップル、25はホース、26はオイル放出穴、27
はＶ溝、28は駆動軸、29はバイパス穴、30は真空容器、
31は通路である。1 is a longitudinal sectional view showing an embodiment of an exhaust structure of a centrifuge according to the present invention, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 3 is a longitudinal section showing an exhaust structure of a conventional centrifuge. FIG. 4 is a longitudinal sectional view showing an exhaust structure of another conventional centrifuge. In the figure, 2 is a rotating chamber, 3 is a rotor, 4 is a sample, 6 is an oil diffusion vacuum pump, 7 is an oil rotary vacuum pump, 8 is a driving device, 11 is a rotating shaft, 13 is a bearing room, 14 is an upper bearing, 15 is a stator, 16 is a high frequency motor, 17 is a lower bearing, 18 is an oil inlet, 19 is oil, 20 is an oil tank, 21a and 21b are housings, 22 is oil return holes, 23a and 23b are shaft cases, and 24 is Nipple, 25 for hose, 26 for oil discharge hole, 27
Is a V-groove, 28 is a drive shaft, 29 is a bypass hole, 30 is a vacuum vessel,
31 is a passage.
Claims (2)
タと、該ロータに回転を付与するために回転軸で接続さ
れたモータと、該回転室内を減圧するための排気装置と
を有し、該回転室と該回転軸の周囲と該駆動装置室内が
連続した空間として構成される遠心機において、前記排
気装置が作動中は、前記回転軸周囲の空間に存在する空
気が、前記回転室側から前記駆動装置室側に向かって流
れるようにしたことを特徴とする遠心機の排気構造。1. A rotor having a built-in sample and disposed in a rotating chamber, a motor connected by a rotating shaft for imparting rotation to the rotor, and an exhaust device for reducing the pressure in the rotating chamber. In the centrifuge configured as a continuous space between the rotation chamber, the periphery of the rotation shaft, and the drive device chamber, while the exhaust device is operating, air existing in the space around the rotation shaft rotates the rotation shaft. An exhaust structure for a centrifuge, wherein the air flows from a chamber side toward the drive unit chamber side.
前記駆動装置内に配し、駆動軸両端を支承する軸受間か
ら前記排気装置に排気されることを特徴とする請求項１
記載の遠心機の排気構造。2. The air existing in the space around the rotation axis,
2. The exhaust device according to claim 1, wherein the exhaust is exhausted from between bearings disposed in the drive device and supporting both ends of the drive shaft.
The exhaust structure of the centrifuge described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2059095A JP2600957B2 (en) | 1990-03-09 | 1990-03-09 | Centrifuge exhaust structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2059095A JP2600957B2 (en) | 1990-03-09 | 1990-03-09 | Centrifuge exhaust structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03258359A JPH03258359A (en) | 1991-11-18 |
| JP2600957B2 true JP2600957B2 (en) | 1997-04-16 |
Family
ID=13103431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2059095A Expired - Fee Related JP2600957B2 (en) | 1990-03-09 | 1990-03-09 | Centrifuge exhaust structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2600957B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012201717A1 (en) * | 2012-02-06 | 2013-08-08 | AusBio Laboratories Co, Ltd. | Sample carrier centrifuge |
| DE102013100180A1 (en) | 2012-03-26 | 2013-09-26 | Gea Mechanical Equipment Gmbh | separator arrangement |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0515957Y2 (en) * | 1987-08-28 | 1993-04-27 |
-
1990
- 1990-03-09 JP JP2059095A patent/JP2600957B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03258359A (en) | 1991-11-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |