【発明の詳細な説明】本発明は回転式流体機械に関する。[Detailed description of the invention]The present invention relates to a rotary fluid machine.
例えば、公知のスクロール型圧縮様は、第1図作動原理
図に示すように、同一形状の2つのうずまき体の一方2
を略中夫に吐出口4を有するシール端板に固定し、両者
を、第1図に示すように、相対的に180°回転させ、
かつこの両者のうずまき体が51.52および51’ 
、 52’の4点で互いに接触するように、距離2ρ(
−うずまきのピノチー2×うずまきの板厚)だけ相対的
にずらして、互いに重ね合せ、一方のうずまき体2を静
止し、他方のり、ずまき休1をクランク半径ρを有する
クランク機構にて、一方のうずまき体2の中心Oの周り
に自転を行なうことなく半径ρ−〇〇′で公転運動をな
すように構成される。For example, in the known scroll type compression system, one of two spiral bodies having the same shape, as shown in FIG.
 is fixed to a seal end plate having a discharge port 4 approximately in the middle, and both are rotated 180° relative to each other as shown in FIG.
 And the spiral bodies of both are 51.52 and 51'
 , 52', the distance 2ρ(
 - Pinochi of the whirlpool 2 x thickness of the whirlpool) are stacked on top of each other, one of the whirlpool bodies 2 is kept stationary, and the other one is moved by a crank mechanism having a crank radius ρ. The spiral body 2 is configured to revolve around the center O at a radius ρ-〇〇' without rotating on its own axis.
そうすると、2つのうずまき体1,2間には、両うずま
き体が当接する点51 、52及び点51’ 、 52
’間に密閉された小室3,3が形成され、密閉小室3,
3の容積がうずまき体1の公転に伴い徐々に変化する。Then, between the two spiral bodies 1 and 2, there are points 51, 52 and points 51', 52 where both the spiral bodies abut.
 ' A sealed small chamber 3, 3 is formed between the sealed small chamber 3,
 3 gradually changes as the spiral body 1 revolves.
すなわち、同図(1)の状態からうずまき体1をまず9
0°公転させると、同図(2)となり、1800公転さ
せると同図(3)に、270°公転させると同図(4)
となり、この間、小室3の容積は徐々に減少し、同図(
4)では2つの小室3.3は連通して小室53となり、
同図(4)の状dから更に90°公転すると、同図(1
)となり、小室53の容積は同図(2)より同図(3)
へとその容積を減少し、同図(3)と同図(4)の間で
最小の容積となり、この間、同図(2)で開きはじめた
外側空間が同図(3)、同図(4)から同図(1)に移
り、新たな気体を取りこんで密閉小室を形成し、以後こ
れを(りかえし、うずまき体外側空間より取りこまれた
気体が圧縮され吐出口4より吐出される。That is, from the state of (1) in the same figure, first turn the spiral body 1 into 9
 When it revolves 0 degrees, it becomes (2) in the same figure, when it revolves 1800 degrees, it becomes (3) in the same figure, and when it revolves 270 degrees, it becomes (4) in the same figure.
 During this period, the volume of small chamber 3 gradually decreases, as shown in the figure (
 In 4), the two chambers 3.3 are connected to form a chamber 53,
 When the figure (4) revolves further 90 degrees from the state d in the figure (4), the figure (1
 ), and the volume of the small chamber 53 is calculated from figure (2) to figure (3).
 The volume decreases to the minimum volume between (3) and (4) in the same figure, and during this time, the outer space that started to open in (2) in the same figure becomes (3) and (4) in the same figure. Moving from 4) to (1) in the same figure, new gas is taken in to form a closed chamber, and this is then repeated (repeat). .
上記は、スクロール型圧縮機の作動原理であるが、スク
ロール型圧縮機は具体的には、第2図縦断面図に示すよ
うに、ハウジング10はフロントエンドプレート11.
リヤエンドプレート12.シリンダプレート13よりな
り、リヤエンドプレート12に吸入口14、吐出口15
を突設すると〜もに、うずまき体252および円板25
1よりなる静止スクロール部材25を固定し、フロント
エンドプレート11にクランクピン23を有する主軸1
7を枢着し、クランクピン23に、第3図(第2図のn
l−in断面図)に示すように、ラジアルニードル軸受
26.公転スクロール部材24のボス243.角筒部材
271.摺動体291 、 IJソング材2929回り
止め293等よりなる公転機構を介して、うずまき体2
42および円板241よりなる公転スクロール部材24
が付設されている。The above is the operating principle of the scroll type compressor. Specifically, as shown in the longitudinal sectional view of FIG. 2, the scroll type compressor has a housing 10, a front end plate 11.
 Rear end plate 12. Consisting of a cylinder plate 13, an intake port 14 and a discharge port 15 on the rear end plate 12.
 When protruding, the spiral body 252 and the disc 25
 The main shaft 1 has a crank pin 23 fixed on the front end plate 11 and has a stationary scroll member 25 fixed thereon.
 7 in Fig. 3 (n in Fig. 2) to the crank pin 23.
 As shown in the radial needle bearing 26. Boss 243 of the revolving scroll member 24. Square tube member 271. The spiral body 2 is rotated through a revolving mechanism consisting of a sliding body 291, an IJ song material 2929, a detent 293, etc.
 42 and a disk 241
 is attached.
このようなスクロール型圧縮機のうずまき体1,2の形
状を決めるものとしては、例えば本発明者らがさきに提
案した特願昭56−1、97672号に詳細に述べたよ
うに、うずまき体の外側および内側の曲線の大部分をイ
ンボリー−ト関数で構成することができるのであるが、
作動原理で述べたように、小室53は漸時その容積を減
少し、これにより吐出ボートから高圧の流体が吐出され
る際、うずまき体には厚さがあるため小室の容積は零と
はならず、いわゆるトップクリアランス容積を残す現象
が存在する。The shapes of the spiral bodies 1 and 2 of such a scroll type compressor are determined by, for example, the spiral bodies as described in detail in Japanese Patent Application No. 97672, proposed earlier by the present inventors. Most of the outer and inner curves of can be composed of involete functions, but
 As described in the operating principle, the volume of the small chamber 53 gradually decreases, so that when high-pressure fluid is discharged from the discharge boat, the volume of the small chamber will not be zero because of the thickness of the spiral body. First, there is a phenomenon that leaves a so-called top clearance volume.
すなわち、第4図要部拡大図に示すように、同図(1)
は、BK1図(3)に対応し、2つのうずまき体1,2
02つの当接点52 、52’間に形成された小室53
は、更に公転すると同図(2)のようになり、こ〜で小
室53の容積は最小となり、更にうずまき体1を公転さ
せると、2つのうずまき体1,2は離れ、当接点52゜
52′はなくなり、2つのうずまき体1,2間で形成さ
れていた小室53は各々のうずまき体外側に形成されて
いる小室3,3に連通ずる。In other words, as shown in the enlarged view of the main part in Figure 4,
 corresponds to BK1 diagram (3), with two spiral bodies 1 and 2
 A small chamber 53 formed between two contact points 52 and 52'
 When the spiral body 1 further revolves, it becomes as shown in FIG. ' has disappeared, and the small chamber 53 formed between the two spiral bodies 1 and 2 communicates with the small chambers 3 and 3 formed on the outside of each spiral body.
このため、同図(2)で表わされる小室の最小容積中の
高圧流体は、吐出ボート4より外部へ吐出されることな
く、再度小室3,3に連通されてしまい、このトップク
リアランス容積の流体に対してなされた圧縮機の仕事は
そのま〜損失となるのである。Therefore, the high-pressure fluid in the minimum volume of the small chamber shown in FIG. The work done by the compressor on the compressor is lost.
また、うずまき体1,2の中央部先端はそれぞれシャー
プエツジとなっているので、運転中にこの部分が破損す
ることがあり、さらにこの先端部分の機緘加工に工数が
が〜っている。  、本発明はこのような事情に鑑みて提案されたもので、ト
ップクリアランス容積を実質的に零となし、損失を最小
とする高効率、長寿命かつ製作容易な回′転式流体機械
を提供することを目的とし、それぞれ同一形状のうずま
き体よりなる静止側うずまき体および旋回側うずまき体
を具えたものにおいて、両うずまき体の当接点間に形成
される中央部の小室容積が両うずまき体の相対約1に伴
い実質的に零になるようにすると匁もに、両うずまき体
をそれぞれ外側曲線と、内方に円弧を有する内側曲線と
、上記両凸線を接続する円弧とで形成したことを特徴と
する。Furthermore, since the tips of the central portions of the spiral bodies 1 and 2 each have sharp edges, these portions may be damaged during operation, and furthermore, machining of these tip portions requires a large number of man-hours. The present invention was proposed in view of the above circumstances, and provides a rotary fluid machine that has a top clearance volume of substantially zero, minimizes loss, has high efficiency, has a long life, and is easy to manufacture. The purpose of the system is to provide a stationary side spiral body and a rotating side spiral body, each of which has the same shape, so that the small chamber volume in the center formed between the contact points of both spiral bodies When the relative value becomes substantially zero with a relative value of about 1, both spiral bodies are formed by an outer curve, an inner curve having an arc inward, and an arc connecting the above-mentioned double convex lines. It is characterized by
本発明をスクロール型圧縮機に適用した一実施例を図面
について説明すると、第5図はそのうずまき体を示す部
分正面図、第6図(1)〜(5)ハ第5図のうずまき体
を具えたスクロール型圧縮機の小室の変化を示す説明図
、第7図は第5図の変形例を示す同じく部分正面図であ
る。An embodiment in which the present invention is applied to a scroll compressor will be explained with reference to the drawings. FIG. 5 is a partial front view showing the spiral body, and FIGS. 6 (1) to (5) show the spiral body of FIG. FIG. 7 is a partial front view showing a modification of FIG. 5.
まず、第5図において、501は本発明に係る(固定側
)うずまき体、601および602はそれぞれうずまき
体501の外側曲線および内側曲線で、外側曲線601
は基円半径す、始点Aのインボ’J 、 −ト曲線、内
側曲線6020EF間は外側曲線601と角度ρπ−一だけ位相をずらせたインボリュート曲す線、DE間は半径凡の円弧とし、外側曲線601と内側
曲線602を接続する接続曲線603は半径γの円弧と
し、点Aは外側曲線601のインボリュート始点、点B
は外側曲線601と接続曲線603の境界点で、両曲線
はこの点でそれぞれ曲率半径を等しくする、−点Cは外
側曲線601の十分外方の点、点りは内側曲線602と
接続曲線603の境界点で、こ〜で半径几およびγの2
つの円弧は接する、点Eは内側曲線6020円弧(DE
間)とインボリュート曲線EFの境界点で、こ匁で両曲
線はそれぞれ曲率半径を等しくする、点Fは内側曲線6
02の十分外方の点である。First, in FIG. 5, 501 is a spiral body (fixed side) according to the present invention, 601 and 602 are an outer curve and an inner curve of the spiral body 501, respectively.
 is the base circle radius, the involute curve at the starting point A, the involute curve between the inner curve 6020EF and the outer curve 601 by an angle ρπ-1, and the arc between DE and the radius A connecting curve 603 connecting the outer curve 601 and the inner curve 602 is an arc of radius γ, and point A is the involute starting point of the outer curve 601 and point B
 is the boundary point between the outer curve 601 and the connecting curve 603, and both curves have the same radius of curvature at this point. - Point C is a point sufficiently outside the outer curve 601; At the boundary point of
 The two arcs touch, point E is the inner curve 6020 arc (DE
 point F is the boundary point between the involute curve EF and the involute curve EF, where both curves have the same radius of curvature.
 This is a point well outside of 02.
他方の公転側うずまき体502も同様である。The same applies to the other revolution side spiral body 502.
こ\で、半径R1γは下記式で表わされる。Here, the radius R1γ is expressed by the following formula.
R=ρ+bβ十dγ=bβ+dたgし、ρ:公転半径す二基円半径b’=(−−4−bβ)′d : −□−−□−ρ2(−−1−bβ)β=パラメータである。R=ρ+bβ10dγ=bβ+dρ: radius of revolutionbase circle radiusb'=(--4-bβ)'d: −□−−□−ρ2(--1-bβ)β=parameterIt is.
次に、第6図において、502は公転側うずまき体、5
52 、552’はそれぞれ両うずまき体の当接点、5
53は当接点552゜552′にて形成される小室、5
03.!503はそれぞれ外方の小室で、第6図(1)
は、第4図(1)に、同図(2)は、第4図(2)に、
同図(3)は、第4図(3)にそれぞれ対応し、また同
図(4) 、 (5)は同図(3)よりうずまき体50
2を更に公転させた場合をそれぞれ示す。Next, in FIG. 6, 502 is a spiral body on the revolution side;
 52 and 552' are contact points of both spiral bodies, 5
 53 is a small chamber formed at contact points 552° and 552';
 03. ! 503 are the outer chambers, respectively, as shown in Fig. 6 (1).
 is shown in Figure 4 (1), Figure 4 (2) is shown in Figure 4 (2),
 Figure (3) corresponds to Figure 4 (3), and Figures (4) and (5) are based on Figure (3).
 2 is further rotated.
本発明では両うずまき体501.502が相対的に第6
図(1) 、 (2) 、 (3) 、 (4) 、 
(5)の順に、公転を行なうと、当接点5!5’2.−
552’で形成される小室553の容積が減少し、同図
(5)で当接点552と552′が同一点となり、これ
により小室553の容積がOとなる。In the present invention, both spiral bodies 501 and 502 are relatively sixth.
 Figures (1), (2), (3), (4),
 When the revolution is performed in the order of (5), contact points 5!5'2. −
 The volume of the small chamber 553 formed by 552' decreases, and the contact points 552 and 552' become the same point in FIG.
このため、従来存在したいわゆるトップクリアランスボ
リュームは零となるから、これより圧縮された流体は吐
出ボート(図示せず)より外部へすべて吐出され、圧縮
機が流体に加えた仕事は、すべて流体に与えられ、従来
存在した損失はなくなる。For this reason, the so-called top clearance volume that existed conventionally becomes zero, so all of the fluid compressed from this volume is discharged to the outside from the discharge boat (not shown), and all the work that the compressor does to the fluid is transferred to the fluid. The losses that previously existed will disappear.
上記実施例においては、説明の便宜上、吐出ボートの大
きさを無視したが、実際には小室553が形成される適
当な位置に吐出ボートを形成する必要があるので、これ
により、若干のトップクリアランスボリュームが生ずる
が、従来のものに比べこの量ははるかに小さく実質的に
零とみなすことができる。In the above embodiment, the size of the discharge boat has been ignored for convenience of explanation, but in reality it is necessary to form the discharge boat at an appropriate position where the small chamber 553 is formed. Although a volume is generated, this amount is much smaller than in the conventional case and can be considered as substantially zero.
うずまき体501,502のそれぞれ中央部の先端形状
は、第5図に示したように、円弧の接続曲線603とし
たことにより、シャープエツジはなくなり、機械の運転
中にこの部分が破損することはなく、また内側曲線60
2のDE間および接続曲線603をそれぞれ円弧とした
ことによりうずまき体の加工が容易となる。As shown in FIG. 5, the tips of the central portions of the spiral bodies 501 and 502 are formed into circular arc connecting curves 603, thereby eliminating sharp edges and preventing damage to these portions during operation of the machine. Also, the inner curve 60
 By making the two DEs and the connection curve 603 circular arcs, the spiral body can be easily processed.
上記実施例において、第5図に示した内側曲線6020
円弧部分DEの半径Rを、第7図に示すように、うずま
き体の溝、1JToの上に等しく、すなわちT。−2R
とすることもできる。In the above embodiment, the inner curve 6020 shown in FIG.
 The radius R of the arc portion DE is set equal to the groove of the spiral body, 1JTo, that is, T, as shown in FIG. -2R
 It is also possible to do this.
このようにすれば、うずまき体の加工は、溝巾T。と同
径のエンドミル等のカッターで、外側曲線と隣接する内
側曲線を同時に加工し、うずまき体の中央部においては
、半径■(の円弧部分DEも同時に加工することができ
、その際の半径R9γは下式で表わされる。In this way, the spiral body can be processed with a groove width of T. Using a cutter such as an end mill with the same diameter, process the outer curve and the adjacent inner curve at the same time, and at the center of the spiral body, the arcuate portion DE with radius ■( can also be machined at the same time. is expressed by the following formula.
上記実施例では、うずまき体の形状がインボリュート始
点を有するスクロール型流体機械について述べたが、こ
牙1に限定されるものではなく、例えば公転IF11乃
ずまき体の中心が円運動を行なうとNもにそのうずまき
体上の一定点が往復運動を行なうようにしたものにも、
本発明はこれを適用することができ、使用する流体は空
気、フレオンガス等でも良く、また用途は、圧縮機、ポ
ンプ、エキスパンダ等でも良い。In the above embodiment, a scroll-type fluid machine is described in which the shape of the spiral body has an involute starting point, but it is not limited to this.For example, if the center of the spiral body performs a circular motion from revolution IF11, Even if a certain point on the spiral body makes a reciprocating motion,
 The present invention can be applied to this, and the fluid used may be air, Freon gas, etc., and the application may be a compressor, pump, expander, etc.
要するに本発明によれば、それぞれ同一形状のうずまき
体よりなる静止側うずまき体および旋回側うずまき体を
具えたものにおいて、両うずまき体の当接点間に形成さ
れる中央部の小室容積が両うずまき体の4目対的旋回に
伴い実質的に零になるようにすると匁もに、両うずまき
体をそれぞれ外側曲線と、内方に円弧を有する内側曲線
と、上記両回線を接続する円弧とで形成したことにより
、低コストかつ高性能の回転式流体機様を得るから、本
発明は産業上極めて有益なものである。In short, according to the present invention, in a device comprising a stationary side spiral body and a rotating side spiral body each having the same shape, the volume of the small chamber in the central portion formed between the contact points of both spiral bodies is In order to make it substantially zero as the line rotates toward the fourth target, both spiral bodies are formed by an outer curve, an inner curve with an inner arc, and an arc connecting the two lines. As a result, a low-cost, high-performance rotary fluid machine can be obtained, so the present invention is extremely useful industrially.
第1図(1) 、 (2) 、 (3) 、 (4)は
それぞれ公知のスクロール型圧縮機の作業原理図、第2
図は公知のスクロール型圧縮機の縦断面図、第3図は第
2図のjiI −illに沿った横断面図、第4図(1
) 、 (2) 、 (31はそれぞれ第2図のうずま
き体の相対的関係位置の変化を示す部分拡大断面図、第
5図は本発明に係るうずまき体を示す部分正面図、第6
図(1) 、 (2> 、 (3) 、 (4) 、 
(5)はそれぞれ第5図のうずまき体を具えたスクロー
ル型圧縮機の両うずまき体の相対的関係位置の変化を示
す部分拡大断面図、第7図は第5図の変形例を示す同じ
く部分正面図である。501 ・固定側うずまき体、502・・・公転側うず
まき体、503・・外方の小室、552゜552′・・
・両うずまき体の当接点、553・・・小室、601・
・・外側曲線、602・・・内側曲線、A・・・外側曲
線のインボリュート始点、B・・・外側曲線と接続曲線
との境界点、C・・・外側曲線上の十分外方の点、D・
・・内側曲線と接続曲線との境界点、E・・・内側曲線
の円弧とインボリュート始点の境界点、F・・・内側曲
線の十分外方の点、b・・・基円半径、ρ・・・公転半径復代理人 弁理士 塚 本 正 文Figures 1 (1), (2), (3), and (4) are diagrams of the working principle of a known scroll compressor, respectively;
 The figure is a longitudinal cross-sectional view of a known scroll compressor, FIG. 3 is a cross-sectional view taken along jiI-ill in FIG. 2, and FIG.
 ), (2), (31 is a partially enlarged cross-sectional view showing changes in the relative position of the spiral body in FIG. 2, FIG. 5 is a partial front view showing the spiral body according to the present invention, and FIG.
 Figures (1), (2>, (3), (4),
 (5) is a partially enlarged cross-sectional view showing changes in the relative position of both spiral bodies of the scroll type compressor equipped with the spiral body shown in Figure 5, and Figure 7 is the same section showing a modification of Figure 5. It is a front view. 501 - Fixed side spiral body, 502... Revolution side spiral body, 503... Outer chamber, 552° 552'...
・Contact point of both spiral bodies, 553... Small chamber, 601・
... Outer curve, 602... Inner curve, A... Involute starting point of outer curve, B... Boundary point between outer curve and connecting curve, C... Point sufficiently outside on outer curve, D.
 ... Boundary point between the inner curve and the connecting curve, E... Boundary point between the arc of the inner curve and the involute starting point, F... A point sufficiently outside the inner curve, b... Radius of the base circle, ρ・...Revolver Radius Sub-Agent Patent Attorney Masafumi Tsukamoto
| Application Number | Priority Date | Filing Date | Title | 
|---|---|---|---|
| JP20608882AJPS5999085A (en) | 1982-11-26 | 1982-11-26 | Rotary hydraulic pump | 
| Application Number | Priority Date | Filing Date | Title | 
|---|---|---|---|
| JP20608882AJPS5999085A (en) | 1982-11-26 | 1982-11-26 | Rotary hydraulic pump | 
| Publication Number | Publication Date | 
|---|---|
| JPS5999085Atrue JPS5999085A (en) | 1984-06-07 | 
| JPH0550598B2 JPH0550598B2 (en) | 1993-07-29 | 
| Application Number | Title | Priority Date | Filing Date | 
|---|---|---|---|
| JP20608882AGrantedJPS5999085A (en) | 1982-11-26 | 1982-11-26 | Rotary hydraulic pump | 
| Country | Link | 
|---|---|
| JP (1) | JPS5999085A (en) | 
| Publication number | Priority date | Publication date | Assignee | Title | 
|---|---|---|---|---|
| DE3519447A1 (en)* | 1984-05-25 | 1985-11-28 | Mitsubishi Jukogyo K.K., Tokio/Tokyo | FLUID ROTARY PISTON COMPRESSOR OR MACHINE | 
| FR2564907A1 (en)* | 1984-05-25 | 1985-11-29 | Mitsubishi Heavy Ind Ltd | ROTARY TYPE FLUID MACHINE | 
| JPS62107283A (en)* | 1985-10-31 | 1987-05-18 | Mitsubishi Heavy Ind Ltd | Rotary fluid machine | 
| US4781549A (en)* | 1985-09-30 | 1988-11-01 | Copeland Corporation | Modified wrap scroll-type machine | 
| JPH04265486A (en)* | 1991-02-21 | 1992-09-21 | Toyota Autom Loom Works Ltd | Scroll compressor | 
| CN1312406C (en)* | 2004-05-12 | 2007-04-25 | 重庆大学 | Whirlpool compressor | 
| JP2007278270A (en)* | 2006-03-17 | 2007-10-25 | Daikin Ind Ltd | Scroll member and scroll compressor provided with the same | 
| Publication number | Priority date | Publication date | Assignee | Title | 
|---|---|---|---|---|
| JPS55101788A (en)* | 1979-01-26 | 1980-08-04 | Mitsubishi Electric Corp | Scroll compressor | 
| Publication number | Priority date | Publication date | Assignee | Title | 
|---|---|---|---|---|
| JPS55101788A (en)* | 1979-01-26 | 1980-08-04 | Mitsubishi Electric Corp | Scroll compressor | 
| Publication number | Priority date | Publication date | Assignee | Title | 
|---|---|---|---|---|
| DE3519447A1 (en)* | 1984-05-25 | 1985-11-28 | Mitsubishi Jukogyo K.K., Tokio/Tokyo | FLUID ROTARY PISTON COMPRESSOR OR MACHINE | 
| FR2564907A1 (en)* | 1984-05-25 | 1985-11-29 | Mitsubishi Heavy Ind Ltd | ROTARY TYPE FLUID MACHINE | 
| GB2159882A (en)* | 1984-05-25 | 1985-12-11 | Mitsubishi Heavy Ind Ltd | Scroll-type rotary fluid machine | 
| FR2568951A1 (en)* | 1984-05-25 | 1986-02-14 | Mitsubishi Heavy Ind Ltd | ROTARY TYPE FLUIDIC MACHINE | 
| US4781549A (en)* | 1985-09-30 | 1988-11-01 | Copeland Corporation | Modified wrap scroll-type machine | 
| JPS62107283A (en)* | 1985-10-31 | 1987-05-18 | Mitsubishi Heavy Ind Ltd | Rotary fluid machine | 
| JPH04265486A (en)* | 1991-02-21 | 1992-09-21 | Toyota Autom Loom Works Ltd | Scroll compressor | 
| CN1312406C (en)* | 2004-05-12 | 2007-04-25 | 重庆大学 | Whirlpool compressor | 
| JP2007278270A (en)* | 2006-03-17 | 2007-10-25 | Daikin Ind Ltd | Scroll member and scroll compressor provided with the same | 
| Publication number | Publication date | 
|---|---|
| JPH0550598B2 (en) | 1993-07-29 | 
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