JPH03189392A - Oilless type screw machine - Google Patents

Oilless type screw machine

Info

Publication number
JPH03189392A
JPH03189392A JP32592189A JP32592189A JPH03189392A JP H03189392 A JPH03189392 A JP H03189392A JP 32592189 A JP32592189 A JP 32592189A JP 32592189 A JP32592189 A JP 32592189A JP H03189392 A JPH03189392 A JP H03189392A
Authority
JP
Japan
Prior art keywords
female rotor
rotor
profile
female
oil
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
JP32592189A
Other languages
Japanese (ja)
Other versions
JP2651253B2 (en
Inventor
Toshiaki Nagai
利昭 永井
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1325921A priority Critical patent/JP2651253B2/en
Publication of JPH03189392A publication Critical patent/JPH03189392A/en
Application granted granted Critical
Publication of JP2651253B2 publication Critical patent/JP2651253B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

PURPOSE:To prevent interference of two rotors with each other by cutting out a part where tooth profile parts are interfered with each other when a male rotor and a female rotor are thermally shrunk. CONSTITUTION:A tangential line 5 running from a center point 2 of a female rotor through a contact 6 of the middle part of the flank of the backward surface of a profile 1 of a female rotor is drawn and a tangential line 7 running from a center point 2 of the female rotor through a point 8 where the tip of the tooth of the female rotor is protruded peripherally inwardly is drawn. In this case, the tangential line 7 crosses the profile 1 at an intersection 9. Further, a straight line 11 for interconnecting an arbitrary point 10 on the flank of the forward surface of the female rotor and the center point 2 is drawn. When a state in a Fig is a state that the temperature of the profile 1 is high, when a rotor temperature is decreased and thermal shrinkage occurs, in a profile, a part 4 shown by oblique lines between the two points 6 and 8 is protruded from the profile 1 radially outwardly. Since this part interferes with the female rotor, a portion corresponding to the part 4 is previously cut out by machining work.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、無給油式スクリュー真空ポンプ、無給油式ス
クリュー圧縮機および無給油式スクリューエキスパンダ
などの無給油式スクリュー機械に係り、とくに熱収縮に
よってオスロータとメスロータとが干渉するのを防止す
゛るのに好適な無給油スクリュー機械に関する。
[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to oil-free screw machines such as oil-free screw vacuum pumps, oil-free screw compressors, and oil-free screw expanders, and particularly relates to oil-free screw machines such as oil-free screw vacuum pumps, oil-free screw compressors, and oil-free screw expanders. The present invention relates to an oil-free screw machine suitable for preventing interference between a male rotor and a female rotor due to contraction.

〔従来の技術〕[Conventional technology]

従来の無給油式スクリュー機械においては、メスロータ
の歯形の内周面にそうでオスロータの歯形が噛合いなが
ら摺動して両ロータ間の気体を圧縮しながら軸方向に移
動するので、−殻内にブローホールの面積を小さくし、
機械効率を向上するために第4図に示すメスロータのプ
ロファイル1の歯先先端角部をR3のかなり小さい半径
、たとえばメスロータの外径が53鰭の場合、半径R3
を0.8fiとしている。なおこの種の装置として関連
するものには、たとえば特公昭56−17559号公報
、特公昭61−8242号公報、特開昭50−1431
06号公報および特開昭61−190184号公報など
が挙げられる。
In conventional oil-free screw machines, the tooth profile of the male rotor slides while meshing with the inner peripheral surface of the tooth profile of the female rotor, compressing the gas between both rotors and moving in the axial direction. to reduce the area of the blowhole,
In order to improve mechanical efficiency, the tip corner of the tooth tip of profile 1 of the female rotor shown in FIG.
is set to 0.8fi. Related devices of this type include, for example, Japanese Patent Publication No. 56-17559, Japanese Patent Publication No. 61-8242, and Japanese Patent Application Laid-open No. 1431-1982.
No. 06 and Japanese Unexamined Patent Publication No. 190184/1984.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

無給油式スクリュー機械のように、取扱う気体の温度の
変化によりオスロータおよびメスロータが熱膨張および
熱収縮する場合においては、一般にメスロータの歯厚が
オスロータに比較して薄く形成されているので、周囲温
度すなわち、オスロータとメスロータ間の空間に存在す
る気体の温度が低下したとき、メスロータの方がまず熱
収縮したのちにオスロータが熱収縮する。その結果、メ
スロータは高温時すなわち熱膨張し第2図に示すような
プロファイル1であったものが、プロファイル3に示す
ように半径方向に収縮するとともに突出部4が形成され
る。
In cases where the male and female rotors thermally expand and contract due to changes in the temperature of the gas being handled, such as in oil-free screw machines, the female rotor's tooth thickness is generally thinner than that of the male rotor, so the ambient temperature That is, when the temperature of the gas existing in the space between the male rotor and the female rotor decreases, the female rotor heat-shrinks first, and then the male rotor heat-shrinks. As a result, the female rotor expands thermally at high temperatures, and the profile 1 shown in FIG. 2 contracts in the radial direction as shown in profile 3, and protrusions 4 are formed.

そのため、オスロータの熱収縮が十分でないとオスロー
タが上記突出部4に接触して打音を発し、強いては、焼
き付けを発生するという問題があった。
Therefore, if the male rotor does not undergo sufficient thermal contraction, the male rotor will come into contact with the protruding portion 4, producing a hammering sound, and eventually causing seizure.

本発明の目的はメスロータが温度降下により熱収縮して
もオスロータと接触するのを防止可能とする無給油式ス
クリュー機械を提供することにある。
An object of the present invention is to provide an oil-free screw machine that can prevent the female rotor from coming into contact with the male rotor even if the female rotor shrinks due to temperature drop.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために、本発明の無給油式スクリュ
ー機械においては、前記メスロータの曲線プロファイル
のうち、前進面または後進面の一方もしくは両方のうち
いずれか一方の円周方向外方に最も突出する部分と接す
る該メスロータの中心からの切線を引き、該メスロータ
の歯先先端部の円周方向内側に突出する部分のうち、温
度降下により熱収縮したとき、上記切線より半径方向内
側に突出する部分もしくは該突出部分に対応するオスロ
ータ部分をあらかじめ削除するものである。
In order to achieve the above object, in the oil-free screw machine of the present invention, among the curved profiles of the female rotor, one or both of the advancing surface and the reversing surface protrudes most outward in the circumferential direction. Draw a cutting line from the center of the female rotor that is in contact with the part of the female rotor that protrudes inward in the circumferential direction of the tooth tips of the female rotor. The male rotor portion or the male rotor portion corresponding to the protruding portion is deleted in advance.

〔作用〕[Effect]

本発明は、オスロータおよびメスロータが熱収縮したと
き歯形部の干渉する部分をあらかじめ削除して両ロータ
が干渉するのを防止するものである。
The present invention prevents the male rotor and the female rotor from interfering with each other by removing in advance the interfering portion of the tooth profile when the male rotor and female rotor are thermally shrunk.

C実施例〕 以下、本発明の実施例を示す第1図および第3図により
説明する。
C Embodiment] Hereinafter, an embodiment of the present invention will be explained with reference to FIGS. 1 and 3.

第1図に示すようにメスロータのプロファイル1のうち
後進面のフランクの中腹の接点6を通るメスロータの中
心点2からの切線5を引き、またメスロータの歯先先端
部の円周方向内側に突出する点8を通るメスロータの中
心点2からの切線7を引く。該切′!a7は上記プロフ
ァイル1と交点9にて交わっている。さらにメスロータ
の前進面フランク上の任意の点10とメスロータの中心
点2とを結ぶ直線11を引く。
As shown in Fig. 1, a cutting line 5 is drawn from the center point 2 of the female rotor that passes through the contact point 6 in the middle of the flank of the backward movement surface of the profile 1 of the female rotor, and also protrudes inward in the circumferential direction at the tip of the tooth tip of the female rotor. Draw a line 7 from the center point 2 of the female rotor that passes through point 8. The cut'! A7 intersects with the profile 1 at the intersection 9. Furthermore, a straight line 11 is drawn connecting an arbitrary point 10 on the forward flank of the female rotor and the center point 2 of the female rotor.

今上記プロファイル1を高温時のロータ形状であるとし
、該プロファイル1が温度降下によって熱収縮した場合
を想定すると、該プロファイル1が熱収縮によってどの
ような形状に変化するかは、ロータ各部の温度分布によ
って異なり変形方向成分は、上記点10とメスロータの
中心点2とを結ぶ直線11にそった半径方向成分とこれ
に垂直な方向の円周方向成分に分解することができる。
Assuming that Profile 1 is the shape of the rotor at high temperatures, and assuming that Profile 1 is thermally contracted due to a drop in temperature, the shape of Profile 1 changed by thermal contraction depends on the temperature of each part of the rotor. The deformation direction component, which varies depending on the distribution, can be decomposed into a radial component along the straight line 11 connecting the point 10 and the center point 2 of the female rotor, and a circumferential component in the direction perpendicular to the straight line 11.

しかるにこれらの熱変形量は、ロータ内の温度分布が細
部を除いてほぼ同心円状になっているため、ロータ各部
の熱変形方向は、半径方向成分によりほぼ決定されると
考えてよい。このような考えで第1図のプロファイルを
考察すると、第1図に示すプロファイル1が高温の状態
であるとすれば、このロータ温度が降下して熱収縮した
とき、プロファイルは第2図に3にて示すように2点6
.8間の斜線にて示す部分4がプロファイル1に対して
半径方向の外側に突出する。そのため、オスロータが温
度降下によって熱変形がほとんどないとすると、上記斜
線部分がオスロータと干渉することになる。ところで、
第2図から明らかなようにプロファイル1の上記2点6
,8間以外の点10と点6までの間はプロファイル1に
対して半径方向の内側に変化するので、点10と点6ま
での間はオスロータと干渉することがない。
However, since the temperature distribution within the rotor is approximately concentric with the exception of small details, it can be considered that the direction of thermal deformation of each part of the rotor is approximately determined by the radial component. Considering the profile in Figure 1 from this perspective, if profile 1 shown in Figure 1 is in a high temperature state, when the rotor temperature drops and thermal contraction occurs, the profile will become 3 as shown in Figure 2. 2 points 6 as shown in
.. A portion 4 indicated by diagonal lines between 8 projects radially outward with respect to the profile 1 . Therefore, assuming that the male rotor undergoes almost no thermal deformation due to temperature drop, the shaded portion will interfere with the male rotor. by the way,
As is clear from Figure 2, the above two points 6 of Profile 1
, 8 changes inward in the radial direction with respect to profile 1, so there is no interference between points 10 and 6 with the male rotor.

そこで、本発明はプロファイル1の上記第2図の斜線に
て示す部分4に相当する第3図に示す斜線部分をあらか
じめ機械加工によって削除して減肉したのである。
Therefore, in the present invention, the shaded area shown in FIG. 3 corresponding to the shaded area 4 in FIG. 2 of the profile 1 is previously removed by machining to reduce the thickness.

而して削除する量と位置は、実験結果によりプロファイ
ルlおよび熱収縮時のプロファイル3をあらかじめ計算
によって算出することにより削除する位置および量を容
易に決定することができる。
The amount and position to be removed can be easily determined by calculating the profile 1 and the profile 3 during heat shrinkage in advance based on experimental results.

したがって、あらかじめ削除して薄肉にすることにより
、高温時にオスロータとメスロータが干渉しなければ、
いずれか一方が先きに温度降下により熱収縮しても両ロ
ータは干渉するのを防止することができるので、ロータ
をあらかじめ与えられた座標通りの形状にすればよく、
これによって無給油式スクリュー機械の騒音、振動を減
少することができる。
Therefore, by removing the wall in advance and making it thinner, the male and female rotors will not interfere with each other at high temperatures.
Even if one of the rotors shrinks due to temperature drop first, both rotors can be prevented from interfering with each other, so it is only necessary to shape the rotors according to the coordinates given in advance.
This allows the noise and vibration of the oil-free screw machine to be reduced.

なお、上記実施例においてはメスロータの突出部分を削
除するものであるが、これに限定されるものでなくメス
ロータの突出部分に対応するオスロータの部分を削除す
ることも可能である。
Note that in the above embodiment, the protruding portion of the female rotor is deleted, but the present invention is not limited to this, and it is also possible to delete the portion of the male rotor that corresponds to the protruding portion of the female rotor.

〔発明の効果〕〔Effect of the invention〕

本発明によればオスロータとメスロータが温度降下によ
って熱収縮しても互いに干渉するのを防止することがで
きるので、騒音、振動の少ない無給油式スクリュー機械
を得ることができる。
According to the present invention, it is possible to prevent the male rotor and the female rotor from interfering with each other even if they are thermally contracted due to a temperature drop, so it is possible to obtain an oil-free screw machine with less noise and vibration.

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

第1図は無給油式スクリュー機械におけるメスロータの
高温時のプロファイルを示す説明図、第2図はメスロー
タの高温時と熱収縮時のプロファイルを示す断面図、第
3図は第2図に示す突出部に相当する削除部分を示す説
明図、第4図は従来のメスロータのプロファイルを示す
説明図である。 1・・・無給油式スクリュー機械のメスロータの高温時
のプロファイル、2・・・メスロータの中心点、3・・
・熱収縮時のメスロータのプロファイル、4・・・熱収
縮時のメスロータの突出部、5,7・・・切線、6.8
・・・接点、9・・・交点、10・・・メスロータの前
進面側の任意の一点、11・・・点lOとメスロータの
中心点とを結ぶ直線。
Figure 1 is an explanatory diagram showing the profile of the female rotor at high temperature in an oil-free screw machine, Figure 2 is a cross-sectional view showing the profile of the female rotor at high temperature and during heat contraction, and Figure 3 is the protrusion shown in Figure 2. FIG. 4 is an explanatory diagram showing the profile of a conventional female rotor. 1...Profile of the female rotor of an oil-free screw machine at high temperature, 2...Center point of the female rotor, 3...
・Profile of female rotor during heat contraction, 4...Protrusion of female rotor during heat shrinkage, 5, 7... Cutting line, 6.8
. . . Point of contact, 9 . . . Intersection, 10 . . . An arbitrary point on the advancing surface side of the female rotor, 11 . . . Straight line connecting point IO and the center point of the female rotor.

Claims (1)

【特許請求の範囲】[Claims] 1、平行な2軸の回りを互いに噛み合って回転するオス
ロータとメスロータからなる無給油式スクリュー機械に
おいて、前記メスロータの曲線プロファイルのうち、前
進面また後進面の一方もしくは両方のいずれか一方の円
周方向外方に突出する部分と接するメスロータの中心か
らの切線を引き、上記メスロータの歯先先端部の円周方
向内側に突出する部分で温度降下により熱収縮したとき
、上記切線よりも半径方向外側に突出する部分もしくは
該突出部分に対応するオスロータ部分のいずれか一方を
あらかじめ減肉することを特徴とする無給油式スクリュ
ー圧縮機。
1. In an oil-free screw machine consisting of a male rotor and a female rotor that mesh and rotate around two parallel axes, the circumference of one or both of the forward and reverse surfaces of the curved profile of the female rotor. Draw a cutting line from the center of the female rotor that touches the part that protrudes outward in the direction, and when the part of the tooth tips of the female rotor that protrudes inward in the circumferential direction heat shrinks due to temperature drop, it will be radially outward from the cutting line. 1. An oil-free screw compressor characterized in that either one of a protruding portion or a male rotor portion corresponding to the protruding portion is thinned in advance.
JP1325921A 1989-12-18 1989-12-18 Oil-free screw machine Expired - Lifetime JP2651253B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1325921A JP2651253B2 (en) 1989-12-18 1989-12-18 Oil-free screw machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1325921A JP2651253B2 (en) 1989-12-18 1989-12-18 Oil-free screw machine

Publications (2)

Publication Number Publication Date
JPH03189392A true JPH03189392A (en) 1991-08-19
JP2651253B2 JP2651253B2 (en) 1997-09-10

Family

ID=18182085

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1325921A Expired - Lifetime JP2651253B2 (en) 1989-12-18 1989-12-18 Oil-free screw machine

Country Status (1)

Country Link
JP (1) JP2651253B2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5937291A (en) * 1982-08-27 1984-02-29 Hitachi Ltd Screw rotor
JPS618242A (en) * 1984-06-21 1986-01-14 Yoshiyuki Yamada Mold panel manufacturing apparatus
JPS61190184A (en) * 1985-02-18 1986-08-23 Kobe Steel Ltd Screw rotor of screw compressor
JPS63205483A (en) * 1987-02-20 1988-08-24 Hitachi Ltd Screw rotor
JPH0166488U (en) * 1988-10-12 1989-04-27

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5937291A (en) * 1982-08-27 1984-02-29 Hitachi Ltd Screw rotor
JPS618242A (en) * 1984-06-21 1986-01-14 Yoshiyuki Yamada Mold panel manufacturing apparatus
JPS61190184A (en) * 1985-02-18 1986-08-23 Kobe Steel Ltd Screw rotor of screw compressor
JPS63205483A (en) * 1987-02-20 1988-08-24 Hitachi Ltd Screw rotor
JPH0166488U (en) * 1988-10-12 1989-04-27

Also Published As

Publication number Publication date
JP2651253B2 (en) 1997-09-10

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