JP2707296B2 - Scroll type fluid machine - Google Patents
Scroll type fluid machineInfo
- Publication number
- JP2707296B2 JP2707296B2 JP29318488A JP29318488A JP2707296B2 JP 2707296 B2 JP2707296 B2 JP 2707296B2 JP 29318488 A JP29318488 A JP 29318488A JP 29318488 A JP29318488 A JP 29318488A JP 2707296 B2 JP2707296 B2 JP 2707296B2
- Authority
- JP
- Japan
- Prior art keywords
- scroll
- wrap
- scroll member
- fluid machine
- pair
- 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
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
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
- F04C18/0269—Details concerning the involute wraps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、スクロール式圧縮機、スクロール式真空ポ
ンプ等として用いられるスクロール式流体機械の改良に
関する。The present invention relates to an improvement in a scroll fluid machine used as a scroll compressor, a scroll vacuum pump, or the like.
従来技術によるスクロール式流体機械としてのスクロ
ール式圧縮機を第２図及び第３図に示す。FIGS. 2 and 3 show a scroll compressor as a scroll fluid machine according to the prior art.
図において、１はケーシング、２は該ケーシング１の
ケーシング本体で、該ケーシング本体２は円筒状の周壁
部2Aと該周壁部2Aを介して対向する一対の円板状の側壁
部2B,2Cとによって、内部がスクロール室３になった中
空容器状に形成されている。４は前記ケーシング本体２
の一側側壁部2Aから外側に突出形成された円筒状の一側
軸受部で、該一側軸受部４の軸線O1−O1は一側側壁部2A
の中心に位置している。一方、５はケーシング本体２の
他側側壁部2Bから外側に突出形成された円筒状の他側軸
受部で、該他側軸受部５の軸線O2−O2は前記一側軸受部
４の軸線O1−O1に対して偏心した位置に設けられてい
る。In the figure, 1 is a casing, 2 is a casing main body of the casing 1, and the casing main body 2 has a cylindrical peripheral wall 2A and a pair of disk-like side walls 2B, 2C opposed to each other via the peripheral wall 2A. Thereby, it is formed in the shape of a hollow container in which the inside becomes the scroll chamber 3. 4 is the casing body 2
A cylindrical one-side bearing portion formed so as to protrude outward from the one-side sidewall portion 2A, and the axis O 1 -O 1 of the one-side bearing portion 4 is aligned with the one-side sidewall portion 2A.
Located in the center of. On the other hand, 5 is a cylindrical other-side bearing portion formed so as to protrude outward from the other side wall portion 2B of the casing body 2, and the axis O 2 -O 2 of the other-side bearing portion 5 is It is provided at a position eccentric with respect to the axis O 1 -O 1 .
６は前記一側軸受部４と同一軸線O1−O1に位置し、該
軸受部４に軸受7,8を介して回転自在に支持された駆動
軸で、該駆動軸６の一端はケーシング１外に突出してモ
ータ（図示せず）に接続され、その他端側はケーシング
１のスクロール室３内に突出している。A drive shaft 6 is located on the same axis O 1 -O 1 as the one-side bearing portion 4 and is rotatably supported by the bearing portion 4 via bearings 7 and 8. One end of the drive shaft 6 is a casing. 1 and is connected to a motor (not shown), and the other end protrudes into the scroll chamber 3 of the casing 1.
９は前記駆動軸６を介してスクロール室３内に回転可
能に設けられた一側スクロール部材で、該一側スクロー
ル部材９は背面側中心が駆動軸６の他端に一体的に固着
された鏡板9Aと、該鏡板9Aの前面にインボリュート又は
インボリュートに近いうず巻状に立設され、駆動軸６の
軸線O1−O1を中心にして径方向に対向する一対のラップ
部9B,9Bとから構成されている。Reference numeral 9 denotes a one-side scroll member rotatably provided in the scroll chamber 3 via the drive shaft 6. The one-side scroll member 9 has a rear-side center integrally fixed to the other end of the drive shaft 6. and end plate 9A, erected on spiral near the involute or involute on the front surface of the end plate 9A, a pair of wrap portion 9B facing the axis O 1 -O 1 in the radial direction about the drive shaft 6, and 9B It is composed of
一方、10はケーシング１の他側軸受部５と同一軸線O2
−O2に位置し、該軸受部５に軸受11,12を介して回転自
在に支持された支持軸で、該支持軸10の軸線O2−O2は駆
動軸６の軸線O1−O1に対して距離δだけ偏心している。On the other hand, 10 is the same axis O 2 as the bearing 5 on the other side of the casing 1.
Located in -O 2, a support shaft rotatably supported via a bearing 11, 12 to the bearing portion 5, the axis O 2 -O 2 of the support shaft 10 the axis O 1 -O drive shaft 6 It is eccentric with respect to 1 by the distance δ.
13は前記支持軸10を介してスクロール室３内に回転自
在に設けられた他側スクロール部材で、該他側スクロー
ル部材13は背面側中心が支持軸10の軸端に一体的に固着
され、一側スクロール部材９の鏡板9Aと対面した鏡板13
Aと、該鏡板13Aの前面にインボリュート又はインボリュ
ートに近いうず巻状に立設され、支持軸10の軸線O2−O2
を中心にして径方向に対向する一対のラップ部13B,13B
とから構成されている。そして、該各ラップ部13Bを一
側スクロール部材９の各ラップ部9Bと重なり合わせた状
態で一側スクロール部材９を回転させると、両ラップ部
9B,13Bの摩擦力によって他側スクロール部13も回転し、
該両スクロール部材9,13が相対的回転運動を行なう間に
複数の圧縮室14,14,…が順次形成されるようになってい
る。Reference numeral 13 denotes another scroll member rotatably provided in the scroll chamber 3 via the support shaft 10, and the other scroll member 13 is integrally fixed to the shaft end of the support shaft 10 at the center on the back side, End plate 13 facing end plate 9A of one-side scroll member 9
A, an involute or a spiral near the involute is erected on the front surface of the end plate 13A, and the axis O 2 −O 2 of the support shaft 10 is provided.
A pair of wrap portions 13B, 13B radially facing each other
It is composed of When the one-side scroll member 9 is rotated in a state where the respective wrap portions 13B overlap with the respective wrap portions 9B of the one-side scroll member 9, the two wrap portions
The other scroll portion 13 also rotates due to the friction force of 9B, 13B,
A plurality of compression chambers 14, 14,... Are sequentially formed while the scroll members 9, 13 perform a relative rotational movement.
15は吸込口で、該吸込口15は最外周側の圧縮室14と連
通するようにケーシング本体２の周壁部2Aに開口形成さ
れている。一方、16は吐出口で、該吐出口16は最中心側
の圧縮室14と連通するように、他側スクロール部材13の
鏡板13Aから支持軸10にかけて軸方向に穿設されてい
る。Reference numeral 15 denotes a suction port, which is formed in the peripheral wall 2A of the casing body 2 so as to communicate with the compression chamber 14 on the outermost peripheral side. On the other hand, reference numeral 16 denotes a discharge port, which is formed in the axial direction from the end plate 13A of the other scroll member 13 to the support shaft 10 so as to communicate with the compression chamber 14 on the most central side.
従来技術は上述の如く構成されており、モータにより
駆動軸６を介して一側スクロール部材９を回転させる
と、他側スクロール部材13も同方向に摺動するが、回転
中心が互いに偏心している両スクロール部材9,13は相対
的な回転運動を行なう結果、各圧縮室14が膨張、縮少を
繰返し、この間吸込口15から吸込んだ空気を各圧縮室14
で圧縮し、吐出口16から吐出するようになっている。The prior art is configured as described above, and when the one-side scroll member 9 is rotated by the motor via the drive shaft 6, the other-side scroll member 13 also slides in the same direction, but the rotation centers are eccentric to each other. As a result of the relative rotation of the two scroll members 9, 13, each compression chamber 14 repeatedly expands and contracts, and during this time, air sucked from the suction port 15 is supplied to each compression chamber 14
And is discharged from the discharge port 16.
ところで、前述の如くケーシング１に対して、一側及
び他側の両スクロール部材9,13を回転可能に設け、ラッ
プ部9B,13Bの摩擦力によって一側スクロール部材９の回
転で他側スクロール部材13を回転させるようになったス
クロール圧縮機にあっては、互いに摺接するラップ部9
B,13B同志の摩擦応力を小さくし、各ラップ部9B,13Bの
摩耗を減少させるために、ラップ部9B,13Bの枚数を多く
設けて圧力角を小さくする必要がある。By the way, as described above, the one-side and the other-side scroll members 9 and 13 are rotatably provided with respect to the casing 1, and the other-side scroll member is rotated by the rotation of the one-side scroll member 9 by the frictional force of the wrap portions 9B and 13B. In the case of a scroll compressor in which the rotating part 13 is rotated,
In order to reduce the frictional stress between B and 13B and reduce the wear of each wrap portion 9B and 13B, it is necessary to increase the number of wrap portions 9B and 13B to reduce the pressure angle.
そこで、従来技術に示す如く、スクロール部材9,13の
各鏡板9A,13Aに180°のラップ角度ピッチを設けて２枚
の同形のラップ部9B,9B及び13B,13Bをそれぞれ対向立設
し、かつ、互いに重なり合うラップ部9B,13Bがラップ角
度ピッチの1/2の位置、即ち周方向に90°離間して位置
するように配設すると、互いに重なり合うラップ部9B,1
3Bによって形成される４個の圧縮室14,14,…の容積はす
べて等しくなる。しかし、４個の圧縮室14,14,…はスク
ロール部材9,13の相対的回転運動によって順次開閉を繰
返すものであるため、スクロール部材9,13の相対的回転
運動の中心点Ｐを間に対向する圧縮室14,14の容積は異
なったものになる。Therefore, as shown in the prior art, two end plates 9A, 13A of the scroll members 9, 13 are provided with a wrap angle pitch of 180 °, and two identical wrap portions 9B, 9B and 13B, 13B are respectively set upright. Further, when the overlapping lap portions 9B, 13B are disposed so as to be located at a position of a half of the lap angle pitch, that is, 90 ° apart in the circumferential direction, the overlapping lap portions 9B, 1B are disposed.
The volumes of the four compression chambers 14, 14,... Formed by 3B are all equal. However, since the four compression chambers 14, 14,... Are repeatedly opened and closed sequentially by the relative rotational movement of the scroll members 9, 13, the center point P of the relative rotational movement of the scroll members 9, 13 is located between them. The volumes of the opposing compression chambers 14, 14 will be different.
このように、ラップ部9B,13Bの圧力角を小さくするた
めに、各鏡板9A,13Aに複数枚のラップ部9B,13Bを立設す
ると、該ラップ部9B,13Bによって回転中心の点対称の位
置に形成される圧縮室14,14内の圧力を力学的にバラン
スさせることは困難である。この結果、スクロール部材
9,13に偏荷重が加わることになり、振動の増加とこれに
伴う各軸受7,8,11,12の寿命低下を招くことになる。As described above, when a plurality of wrap portions 9B and 13B are erected on each of the end plates 9A and 13A in order to reduce the pressure angle of the wrap portions 9B and 13B, the wrap portions 9B and 13B cause point symmetry of the rotation center. It is difficult to mechanically balance the pressure in the compression chambers 14, formed at the positions. As a result, the scroll member
An eccentric load is applied to the bearings 9 and 13, which causes an increase in vibration and a corresponding decrease in the life of the bearings 7, 8, 11, and 12.
本発明は上述した従来技術の欠点に鑑みなされたもの
で、圧縮室内の圧力を力学的にバランスさせ、スクロー
ル部材の振動発生、軸受の寿命低下を防止できるように
したスクロール式流体機械を提供することを目的とす
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above-described drawbacks of the related art, and provides a scroll-type fluid machine capable of mechanically balancing the pressure in a compression chamber to prevent the occurrence of vibration of a scroll member and a reduction in the life of a bearing. The purpose is to:
上述した課題を解決するために構成された本発明の手
段の特徴は、一対のスクロール部材の各鏡板に少なくと
も３枚以上の奇数枚のラップ部を立設し、該一対のスク
ロール部材を相対的に回転させたとき、両スクロール部
材のラップ部間に形成される複数の圧縮室のうち相対回
転の中心点を間に対向する圧縮室の容積が等しくなるよ
うにしたことにある。A feature of the means of the present invention configured to solve the above-described problem is that at least three or more odd-numbered wrap portions are erected on each end plate of the pair of scroll members, and the pair of scroll members are relatively positioned. In this case, the volume of the compression chambers which oppose the center point of the relative rotation among the plurality of compression chambers formed between the wrap portions of the scroll members is made equal.
このように構成することにより、各鏡板に立設された
奇数枚のラップ部は対向する鏡板に立設されたラップ部
と常に対向することになり、相対的回転運動の中心を間
に径方向の対称の位置に形成される圧縮室の容積は等し
くなるため、各スクロール部材に対して径方向及び周方
向に働く力は極めて小さくなる。With such a configuration, the odd number of wrap portions erected on each head plate always face the wrap portions erected on the opposing head plate, and the center of the relative rotational movement is placed in the radial direction. Since the volumes of the compression chambers formed at the symmetrical positions are equal, the forces acting on each scroll member in the radial and circumferential directions are extremely small.
以下、本発明の実施例を第１図に基づき詳述する。な
お、前述した従来技術の構成要素と同一の構成要素に同
一符号を付し、その説明を省略する。Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. The same reference numerals are given to the same components as those of the above-described conventional technology, and the description thereof will be omitted.
然るに、図中21は一側スクロール部材で、該一側スク
ロール部材21は駆動軸６の軸端に一体的に固着され鏡板
21A（但し図示せず）と、該鏡板に立設された３枚のう
ず巻状ラップ部21B,21B,21Bとから構成されており、該
各ラップ部21Bのラップ角度ピッチは120°に設定されて
いる。In the drawing, reference numeral 21 denotes a one-side scroll member, and the one-side scroll member 21 is integrally fixed to the shaft end of the drive shaft 6 and is a mirror plate.
21A (not shown) and three spiral wrap portions 21B, 21B, 21B erected on the end plate, and the wrap angle pitch of each wrap portion 21B is set to 120 °. Have been.
一方、22は前記一側スクロール部材21に対面してケー
シング１のスクロール室３内に回転可能に配設された他
側スクロール部材で、該他側スクロール部材22は支持軸
10の軸端に背面側が一体的に固着された鏡板22Aと、該
鏡板22Aの前面に立設された３枚のうず巻状ラップ部22
B,22B,22Bとから構成されており、該各ラップ部22Bのラ
ップ角度ピッチは前記一側スクロール部材21と同様に、
120°になっている。On the other hand, reference numeral 22 denotes another scroll member facing the one scroll member 21 and rotatably disposed in the scroll chamber 3 of the casing 1, and the other scroll member 22 is a support shaft.
A mirror plate 22A having a back side integrally fixed to the shaft end of the shaft 10; and three spiral wrap portions 22 erected on the front surface of the mirror plate 22A.
B, 22B, 22B, and the wrap angle pitch of each wrap portion 22B is the same as the one-side scroll member 21,
It is 120 °.
かくして、前記両スクロール部材21,22の各ラップ部2
1B,21Bを重ね合わせたとき、各ラップ部21B（22B）は他
方のラップ部22B（21B）と常に対向することになり、両
スクロール部材21,22間に形成される複数の圧縮室23,2
3,…のうち、相対回転運動の中心点Ｐを間に対向する圧
縮室23,23は常に同じ容積になっている。Thus, each wrap portion 2 of the two scroll members 21 and 22
When 1B and 21B are overlapped, each wrap portion 21B (22B) always faces the other wrap portion 22B (21B), and a plurality of compression chambers 23 and 22 formed between both scroll members 21 and 22 are formed. Two
Of the three, the compression chambers 23, 23 opposed to each other with the center point P of the relative rotational motion therebetween always have the same volume.
実施例は上述の如く構成されており、一側スクロール
部材21と他側スクロール部材22を相対回転することによ
り、各圧縮室23内で空気を圧縮する作動自体については
従来技術と実質的に異なるところはない。The embodiment is configured as described above, and the operation itself of compressing air in each compression chamber 23 by relatively rotating the one-side scroll member 21 and the other-side scroll member 22 is substantially different from the related art. There is no place.
しかるに、実施例によれば、各スクロール部材21,22
の鏡板21A,22Aに奇数枚の３枚のラップ部21B,21B,21B及
び22B,22B,22Bを立設することにより、両スクロール部
材21,22のラップ部21B,22B間に形成される複数の圧縮室
23,23,…のうち、回転中心Ｐを間に対向する圧縮室23,2
3の容積は等しくなるから、両圧縮室23,23内の圧力をバ
ランスさせることができる。従って、各スクロール部材
21,22に偏荷重が加わるのを防止でき、スクロール部材2
1,22の振動抑制及び軸受の寿命の向上を図ることができ
る。However, according to the embodiment, each of the scroll members 21 and 22
By forming the odd number of three wrap portions 21B, 21B, 21B and 22B, 22B, 22B on the end plates 21A, 22A of the scroll members 21, a plurality of wrap portions 21B, 22B formed between the scroll members 21, 22 are formed. Compression chamber
Among the compression chambers 23, 23, the rotation centers P of which are opposed to each other.
Since the volume of 3 is equal, the pressure in both compression chambers 23 can be balanced. Therefore, each scroll member
It is possible to prevent imbalanced load from being applied to 21, 22 and the scroll member 2
It is possible to suppress vibrations of 1,22 and improve the life of the bearing.
また、実施例では従来技術よりもラップ部21B,22Bの
枚数を多くしたから、圧力脈動、トルク変動を小さくで
きるし、ラップ部の重心が理論的中心に近くなるからス
クロール部材21,22のバランスを向上できる。Further, in the embodiment, since the number of the wrap portions 21B and 22B is larger than that of the prior art, the pressure pulsation and the torque fluctuation can be reduced, and the center of gravity of the wrap portion becomes closer to the theoretical center, so that the balance of the scroll members 21 and 22 is improved. Can be improved.
なお、実施例では各鏡板21A,22Aに奇数枚の３枚のラ
ップ部21B,21B,21B及び22B,22B,22Bを立設するものとし
て述べたが、ラップ部の枚数は３枚以上の奇数枚であれ
ばよい。また、実施例のスクロール部材21,22はケーシ
ング１に対して回転自在に設けたが、例えば一方のスク
ロール部材がケーシングに固着され、他方のスクロール
部材のみが旋回運動を行なうスクロール式流体機械にも
本発明は適用できるものである。In the embodiment, it is described that three odd wrap portions 21B, 21B, 21B and 22B, 22B, 22B are erected on each end plate 21A, 22A, but the number of wrap portions is three or more odd numbers. Any number is acceptable. Although the scroll members 21 and 22 of the embodiment are provided rotatably with respect to the casing 1, for example, a scroll type fluid machine in which one scroll member is fixed to the casing and only the other scroll member performs a revolving motion is also available. The present invention is applicable.
本発明は以上詳述した如くであって、一対のスクロー
ル部材間に形成される複数の圧縮室のうち、相対回転の
中心点を間に対向する圧縮室はその容積が等しくなるよ
うに構成し、各圧縮室内の圧力をバランスさせるように
したから、スクロール部材に偏荷重が加わって振動した
り、軸受が偏摩耗するのを防止でき、耐久性に優れたス
クロール式流体機械にすることができる。The present invention is as described in detail above, and among a plurality of compression chambers formed between a pair of scroll members, compression chambers opposed to each other with a center point of relative rotation therebetween are configured to have equal volumes. Since the pressures in the respective compression chambers are balanced, it is possible to prevent the scroll member from vibrating due to an uneven load applied thereto and to prevent the bearing from being unevenly worn, thereby providing a scroll type fluid machine having excellent durability. .
第１図は本発明の実施例に係るスクロール式圧縮機を第
３図と同様の位置で示す断面図、第２図及び第３図は従
来技術に係り、第２図はスクロール圧縮機を断面にして
示す正面図、第３図は第２図中のIII−III矢示方向断面
図である。 １……ケーシング、21,22……スクロール部材、21A,22A
……鏡板、21B,22B……ラップ部、23……圧縮室、Ｐ…
…中心点。FIG. 1 is a sectional view showing a scroll compressor according to an embodiment of the present invention at the same position as FIG. 3, FIGS. 2 and 3 relate to the prior art, and FIG. 2 is a sectional view of the scroll compressor. FIG. 3 is a sectional view taken along the line III-III in FIG. 1. Casing, 21, 22 Scroll member, 21A, 22A
… End plate, 21B, 22B… Wrap, 23… Compression chamber, P…
…Center point.
Claims (1)
いに重なり合ううず巻状ラップ部をそれぞれ立設してな
る一対のスクロール部材を有し、該一対のスクロール部
材を相対的に回転させることにより該スクロール部材の
ラップ部間に密閉空間を形成するようになったスクロー
ル式流体機械において、前記一対のスクロール部材の各
鏡板に少なくとも３枚以上の奇数枚のラップ部を立設
し、該一対のスクロール部材を相対的に回転させたと
き、両スクロール部材のラップ部間に形成される複数の
圧縮室のうち相対回転の中心点を間に対向する圧縮室の
容積が等しくなるように構成したことを特徴とするスク
ロール式流体機械。1. A pair of scroll members each having a pair of spirally wrapped portions erected on an end plate facing each other with their axes eccentric, and the pair of scroll members are relatively rotated. In the scroll type fluid machine, a closed space is formed between the wrap portions of the scroll member, and at least three or more odd number wrap portions are erected on each end plate of the pair of scroll members. When the scroll member is relatively rotated, the compression chambers which oppose the center point of the relative rotation among the plurality of compression chambers formed between the wrap portions of both scroll members are configured to have the same volume. A scroll type fluid machine characterized by the above-mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29318488A JP2707296B2 (en) | 1988-11-19 | 1988-11-19 | Scroll type fluid machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29318488A JP2707296B2 (en) | 1988-11-19 | 1988-11-19 | Scroll type fluid machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02140484A JPH02140484A (en) | 1990-05-30 |
| JP2707296B2 true JP2707296B2 (en) | 1998-01-28 |
Family
ID=17791505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29318488A Expired - Lifetime JP2707296B2 (en) | 1988-11-19 | 1988-11-19 | Scroll type fluid machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2707296B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5616015A (en) * | 1995-06-07 | 1997-04-01 | Varian Associates, Inc. | High displacement rate, scroll-type, fluid handling apparatus |
| JP4556183B2 (en) * | 2005-07-12 | 2010-10-06 | 有限会社スクロール技研 | Scroll fluid machinery |
| JP6749811B2 (en) * | 2016-08-01 | 2020-09-02 | 三菱重工業株式会社 | Double rotary scroll compressor and its design method |
-
1988
- 1988-11-19 JP JP29318488A patent/JP2707296B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02140484A (en) | 1990-05-30 |
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