JPH0350952B2 - - Google Patents
Info
- Publication number
- JPH0350952B2 JPH0350952B2 JP60014174A JP1417485A JPH0350952B2 JP H0350952 B2 JPH0350952 B2 JP H0350952B2 JP 60014174 A JP60014174 A JP 60014174A JP 1417485 A JP1417485 A JP 1417485A JP H0350952 B2 JPH0350952 B2 JP H0350952B2
- Authority
- JP
- Japan
- Prior art keywords
- expansion turbine
- shaft
- turbine
- small
- rotation speed
- 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 - Lifetime
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- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、膨張タービンに係り、特に寒冷発生
量が小さい小形の膨張タービンに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an expansion turbine, and particularly to a small expansion turbine that generates a small amount of cold.
機械の研究、第33巻、第４号、（1981）、P16の
ヘリウム液化膨張タービンの構造に示されている
ように従来はシヤフトの回転数を測定するために
シヤフトに切欠きを設けて回転数検出用測定子に
より回転数を求めるようになつていた。しかし膨
張タービンを小形化してくると寒冷発生量が小さ
くなりシヤフトのほとんどを保冷槽内に収容して
タービンロータ部（低温部）と常温部の距離を設
ける必要がある。すなわち常温からの侵入熱を小
さくする必要がある。そのために従来の構造のも
のをそのまま適用すれば回転数検出用測定子付近
は低温となり通常のＯリング等によるシール構造
ではヘリウムリークが生ずるという問題があつ
た。
As shown in the structure of a helium liquefaction expansion turbine in Mechanical Research, Vol. 33, No. 4, (1981), p. 16, in the past, a notch was provided in the shaft to measure the rotation speed of the shaft. The number of rotations was determined using a number detection probe. However, as the expansion turbine becomes smaller, the amount of cold generation decreases, and it is necessary to accommodate most of the shaft in a cold storage tank to provide a distance between the turbine rotor section (low temperature section) and the normal temperature section. In other words, it is necessary to reduce the amount of heat that enters from room temperature. For this reason, if the conventional structure was applied as is, the temperature around the rotational speed detecting probe would be low, resulting in a problem that helium leakage would occur with a seal structure using a normal O-ring or the like.
また、シヤフトに切欠きを設けることによつて
軸の剛性が低下するため、軸径の小さい超小形の
膨張タービンでは高速回転時には軸の変形（曲が
り）を生じ、高速回転を不安定なものにしている
という問題があつた。 In addition, providing a notch in the shaft reduces the rigidity of the shaft, so in ultra-compact expansion turbines with small shaft diameters, the shaft deforms (bends) during high-speed rotation, making high-speed rotation unstable. There was a problem that
本発明の目的は、寒冷発生が小さい小型の膨張
タービンにおいても、膨張タービンの性能を悪く
することなく簡単に回転数を検出できる膨張ター
ビンを提供することにある。
An object of the present invention is to provide an expansion turbine in which the rotation speed can be easily detected without deteriorating the performance of the expansion turbine even in a small expansion turbine that generates only a small amount of cold.
本発明は、一端にロータを有し他端にブレーキ
フアンを有するシヤフトを、ジヤーナル軸受およ
びスラスト軸受を介してケーシング内に収納し支
持してなる膨張タービンにおいて、ブレーキフア
ンの羽根に対応させてケーシングに回転数検出測
定子を設けることにより、寒冷発生が小さい小型
の膨張タービンにおいても、膨張タービンの性能
を悪くすることなく簡単に回転数を検出できるよ
うにしたものである。
The present invention relates to an expansion turbine in which a shaft having a rotor at one end and a brake fan at the other end is accommodated and supported in a casing via a journal bearing and a thrust bearing. By providing a rotation speed detection measuring element in the rotor, it is possible to easily detect the rotation speed without deteriorating the performance of the expansion turbine, even in a small expansion turbine where cold generation is small.
以下本発明の一実施例を第１図〜第３図により
説明する。
An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
第１図は例えばヘリウム冷凍機に用いられる寒
冷発生用の膨張タービンの便宜的な断面図であ
る。１は高速回転する主軸であり、その下端には
ロータ２が取付けられ、上端にはブレーキフアン
４が設けられている。３は主軸１を支えるジヤー
ナル軸受でありスラスト方向はスラスト軸受３′
により支えられる。本例においては動圧の気体軸
受を用いてある。ガスの流れを説明すると作動ガ
スである高圧ヘリウムは移送管５を通りノズル１
２より噴出してロータ２に動力を伝達し断熱、膨
張して温度、圧力を低下して移送管６を通つて一
般的には冷凍機の他の構成要素である熱交換器
（図示せず）へ導かれる。次にブレーキフアン４
には移送管７を通つてヘリウムガスが導かれヘリ
ウムガスを圧縮して移送管８を通つて冷却された
後再び移送管７へ戻るような閉サイクルとなつて
いる。またこの際発生した圧縮熱は他の熱交換器
によユて系外に取り去られる。また９，９′はこ
れらタービンの構成要素を収納するケーシングで
あり、ケーシング９は真空保冷槽１０に取り付け
られている。 FIG. 1 is a convenient cross-sectional view of an expansion turbine for generating cold, which is used, for example, in a helium refrigerator. Reference numeral 1 denotes a main shaft that rotates at high speed, a rotor 2 is attached to its lower end, and a brake fan 4 is provided to its upper end. 3 is a journal bearing that supports the main shaft 1, and the thrust direction is the thrust bearing 3'
Supported by In this example, a dynamic pressure gas bearing is used. To explain the gas flow, high-pressure helium, which is a working gas, passes through the transfer pipe 5 and enters the nozzle 1.
2 and transmits the power to the rotor 2, which insulates and expands to lower the temperature and pressure, and then passes through the transfer pipe 6 to a heat exchanger (not shown), which is another component of the refrigerator. ). Next, brake fan 4
In this closed cycle, helium gas is introduced through the transfer pipe 7, compressed, cooled through the transfer pipe 8, and then returned to the transfer pipe 7 again. Further, the compression heat generated at this time is removed from the system by another heat exchanger. Furthermore, 9 and 9' are casings that house these turbine components, and the casing 9 is attached to a vacuum cold storage tank 10.
主軸１の回転数の測定はケーシング９′に設け
た測定孔１１に非接触式の回転数検出用測定子、
例えば、ギヤツプセンサー１３を取り付けて実施
されるようになつている。このギヤツプセンサー
１３により第２図、第３図のブレーキフアン４の
羽根４′をパルス信号として測定し回転数を求め
る構造となつており、従来行われて来た第１図Ａ
部にキヤツプセンサーを取り付ける方法よりもよ
り簡単にタービンの分解および組立が容易に実施
できる。またＡ部にギヤツプセンサーを組込む構
造では真空リークが問題となる。特に小形の膨張
タービンでは寒冷発生量が小さいため常温部から
の侵入熱を小さく取る必要があるため、Ａ部では
低温になつており単純なシール構造たとえばＯリ
ングを用いるような構造ではヘリウムリークを防
ぐことが困難である。また従来例のように主軸に
切欠きを設ける方式を小形のものに適用すると軸
径に対する切欠きの割合が大きくなり軸の強度の
低下をまねき、主軸の危険速度を下げる問題があ
つたが、本実施例によれば構造が簡単でタービン
の分解、組立を容易に行うことができ、かつギヤ
ツプセンサーからのヘリウムリークによる真空保
冷槽の真空ブレークを容易に防ぐ効果がある。ま
た、主軸の強度低下をまねく問題もなく信頼性の
高い膨張タービンを提供できる効果がある。 To measure the rotation speed of the main shaft 1, a non-contact rotation speed detection probe is inserted into the measurement hole 11 provided in the casing 9'.
For example, a gap sensor 13 is attached to the device. This gap sensor 13 measures the blades 4' of the brake fan 4 shown in Figs. 2 and 3 as a pulse signal to determine the rotation speed, which is different from the conventional method shown in Fig. 1A.
The turbine can be disassembled and assembled more easily than the method of attaching a cap sensor to the turbine. Furthermore, in a structure in which a gap sensor is incorporated in part A, vacuum leakage becomes a problem. Particularly in small expansion turbines, the amount of cold generation is small, so it is necessary to minimize the amount of heat that enters from the normal temperature section.The temperature in section A is low, and a simple seal structure using an O-ring, for example, prevents helium leaks. difficult to prevent. Furthermore, if the conventional method of providing a notch in the main shaft is applied to a small type, the ratio of the notch to the shaft diameter increases, leading to a decrease in the strength of the shaft and reducing the critical speed of the main shaft. According to this embodiment, the structure is simple and the turbine can be easily disassembled and assembled, and it is also effective in easily preventing a vacuum break in the vacuum cold storage tank due to helium leak from the gap sensor. Further, there is an effect that a highly reliable expansion turbine can be provided without the problem of reducing the strength of the main shaft.
本発明によれば、寒冷発生が小さい小型の膨張
タービンにおいても、膨張タービンの性能を悪く
することなく簡単に回転数を検出できるという効
果がある。
According to the present invention, even in a small expansion turbine that generates only a small amount of cold, the rotation speed can be easily detected without deteriorating the performance of the expansion turbine.
第１図は本発明による膨張タービンの一実施例
を示すものでヘリウム冷凍機用の膨張タービンの
縦断面図、第２図は第１図のブレーキフアンの部
分平面図、第３図は第２図の縦断面図である。
１……主軸、２……ロータ、４……ブレーキフ
アン、９，９′……ケーシング、１３……ギヤツ
プセンサー。
FIG. 1 shows an embodiment of an expansion turbine according to the present invention, and is a longitudinal sectional view of an expansion turbine for a helium refrigerator, FIG. 2 is a partial plan view of the brake fan shown in FIG. 1, and FIG. FIG. 1...Main shaft, 2...Rotor, 4...Brake fan, 9, 9'...Casing, 13...Gap sensor.
Claims (1)
有するシヤフトを、ジヤーナル軸受およびスラス
ト軸受を介してケーシング内に収納し支持してな
る膨張タービンにおいて、 前記ブレーキフアンの羽根に対応させて前記ケ
ーシングに回転数検出測定子を設けたことを特徴
とする膨張タービン。[Scope of Claims] 1. An expansion turbine in which a shaft having a rotor at one end and a brake fan at the other end is housed and supported in a casing via a journal bearing and a thrust bearing, wherein a blade of the brake fan includes: An expansion turbine characterized in that the casing is provided with a rotation speed detection measuring element correspondingly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1417485A JPS61175450A (en) | 1985-01-30 | 1985-01-30 | Expansion turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1417485A JPS61175450A (en) | 1985-01-30 | 1985-01-30 | Expansion turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61175450A JPS61175450A (en) | 1986-08-07 |
| JPH0350952B2 true JPH0350952B2 (en) | 1991-08-05 |
Family
ID=11853776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1417485A Granted JPS61175450A (en) | 1985-01-30 | 1985-01-30 | Expansion turbine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61175450A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5585852A (en) * | 1979-12-18 | 1980-06-28 | Tokyo Shibaura Electric Co | Low temperature refrigerating plant |
| JPS57117758A (en) * | 1981-01-14 | 1982-07-22 | Hitachi Ltd | Control of expansion turbine |
-
1985
- 1985-01-30 JP JP1417485A patent/JPS61175450A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61175450A (en) | 1986-08-07 |
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