JP2679155B2 - Scroll compressor - Google Patents

Scroll compressor

Info

Publication number
JP2679155B2
JP2679155B2 JP24007788A JP24007788A JP2679155B2 JP 2679155 B2 JP2679155 B2 JP 2679155B2 JP 24007788 A JP24007788 A JP 24007788A JP 24007788 A JP24007788 A JP 24007788A JP 2679155 B2 JP2679155 B2 JP 2679155B2
Authority
JP
Japan
Prior art keywords
scroll
spiral
scrolls
teeth
thermal expansion
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
Application number
JP24007788A
Other languages
Japanese (ja)
Other versions
JPH0286979A (en
Inventor
博史 小川
恵樹 境野
文昭 佐野
教秀 小林
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP24007788A priority Critical patent/JP2679155B2/en
Publication of JPH0286979A publication Critical patent/JPH0286979A/en
Application granted granted Critical
Publication of JP2679155B2 publication Critical patent/JP2679155B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02Rotary-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
    • F04C18/0207Rotary-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
    • F04C18/0246Details concerning the involute wraps or their base, e.g. geometry
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05CINDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00Material properties
    • F05C2251/04Thermal properties
    • F05C2251/042Expansivity
    • F05C2251/046Expansivity dissimilar

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〕 本発明は冷凍・空調用に使用されるスクロール圧縮機
に関するものである。
TECHNICAL FIELD The present invention relates to a scroll compressor used for refrigeration and air conditioning.

〔従来の技術〕[Conventional technology]

第3図は,スクロール圧縮機に使用されている円イン
ボリュートタイプの渦巻歯を有する固定スクロール(10
1)と揺動スクロール(102)を示したものである。従来
のスクロール圧縮機においては,両スクロールの素材は
同一であり,かつ両スクロールの渦巻歯は同一形状であ
る。そして,それらは横断面図第4図に示すように,一
方を180゜回転させて,しかも両スクロールの渦巻歯の
基礎円中心間の距離が,P/2−t(Pはインボリュートの
ピッチ,tは歯厚)となるように配置して,理論上4箇所
{(a),(b),(c),(d)}で接している。
Fig. 3 shows a fixed scroll with spiral involute type spiral teeth used in scroll compressors (10
1) and an orbiting scroll (102) are shown. In the conventional scroll compressor, the materials of both scrolls are the same, and the spiral teeth of both scrolls have the same shape. As shown in Fig. 4 of the cross-sectional view, one of them is rotated 180 °, and the distance between the centers of the basic circles of the scroll teeth of both scrolls is P / 2-t (P is the pitch of the involute, They are arranged so that t is the tooth thickness), and theoretically, they are in contact at four places {(a), (b), (c), (d)}.

第5図はスクロール圧縮機の圧縮動作の説明図であ
る。第5図において,クランク軸が左回転するのに同期
して,揺動スクロール(2)は自転することなく左回転
で公転する。(a)→(b)→(c)→(d)の順に斜
線部の圧縮室の容積が減少していくのがわかる。その
際,各圧縮室は,例えば第4図を例にとると,(a)〜
(d)の4ケ所の接点(固定スクロール渦巻歯(1)と
揺動スクロール渦巻歯(2)とで形成される接点。実際
には紙面の表裏方向にのびる接線である。)によって仕
切られ,それらの接点がクランク軸の回転にともなって
中心に向かってインボリュート曲線上を移動していくの
である。
FIG. 5 is an explanatory diagram of the compression operation of the scroll compressor. In FIG. 5, in synchronization with the left rotation of the crankshaft, the orbiting scroll (2) revolves in the left rotation without rotating. It can be seen that the volume of the compression chamber in the shaded area decreases in the order of (a) → (b) → (c) → (d). At that time, each compression chamber has, for example, as shown in FIG.
It is partitioned by four contact points (d) (contact points formed by the fixed scroll spiral teeth (1) and the orbiting scroll spiral teeth (2). Actually, they are tangent lines extending in the front and back directions of the paper surface). These contacts move along the involute curve toward the center as the crankshaft rotates.

以上の原理で,外周部で取り込まれた低圧のガスは,
ゆっくりと圧縮されながら高圧ガスとなり中心室へと導
かれる。
Based on the above principle, the low-pressure gas taken in at the outer periphery is
While being slowly compressed, it becomes high-pressure gas and is guided to the central chamber.

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

従来は固定スクロール,揺動スクロールともに鉄系の
材料が使用されることが多かったが,近年圧縮機の高速
化にともない,揺動スクロールにアルミニウム,樹脂等
の軽量材料が使用されることが多くなりつつある。つま
り,固定スクロールと揺動スクロールで,使用される材
料が異なる場合がでてきている。両スクロールの渦巻歯
の材料が異なる場合,常温での渦巻形状が同一の両スク
ロールを用いて運転すると,運転中の両スクロールは高
温ガスにさらされて高温になるため熱膨張率の差が主要
因となって両スクロールの渦巻歯形状が同一でなくなっ
てしまう。その様子を第6図に示す。第6図は,鋳鉄の
固定スクロールの渦巻歯の形状(1)及びそれと同一形
状のアルミニウムの揺動スクロールの渦巻歯の形状(2
2)及びそれらの温度上昇時の形状(1B)、(22B)を示
したものである。それゆえ,組み合わせた際には,第4
図に示したように4ケ所での接点が形成されず,第7図
に示すようにある箇所では歯同士が干渉し,{(a),
(c)}別の箇所では歯と歯の間に大きな洩れすき間が
生じてしまう。{(b),(d)} この発明は上記の運転時における“干渉”及び“洩れ
すき間”を減少させるためになされたもので,干渉によ
るメカロスや洩れによるロスを押さえることにより高効
率を実現すると同時に,干渉による音・振動の低減を実
現し,また,干渉に起因する信頼性の低下を回避するス
クロール圧縮機を得ることを目的とする。
In the past, iron-based materials were often used for both fixed scrolls and orbiting scrolls, but with the recent increase in speed of compressors, lightweight materials such as aluminum and resin are often used for orbiting scrolls. It is becoming. In other words, the materials used for the fixed scroll and the orbiting scroll may differ. When the materials of the spiral teeth of both scrolls are different and both scrolls with the same spiral shape at normal temperature are operated, both scrolls in operation are exposed to high temperature gas and become high temperature, and the difference in the coefficient of thermal expansion is As a result, the spiral tooth shapes of both scrolls will not be the same. This is shown in FIG. Fig. 6 shows the shape of spiral teeth of a fixed scroll of cast iron (1) and the shape of spiral teeth of an orbiting scroll of aluminum of the same shape (2).
2) and their shapes (1B) and (22B) when the temperature rises. Therefore, when combined, the fourth
As shown in the figure, contact points were not formed at four points, and at certain points, the teeth interfered with each other, causing {(a),
(C)} At another place, a large leakage gap is generated between the teeth. {(B), (d)} This invention was made to reduce the "interference" and the "leakage gap" during the above operation, and realizes high efficiency by suppressing the mechanical loss due to the interference and the loss due to the leakage. At the same time, it is an object of the present invention to obtain a scroll compressor that realizes reduction of sound and vibration due to interference and avoids deterioration of reliability due to interference.

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

この発明に係わるスクロール圧縮機は、円インボリュ
ートタイプの渦巻歯を有し、それぞれ材質の異なる固定
スクロール及び揺動スクロールを備えたスクロール圧縮
機において、渦巻歯の任意の点の渦巻中心からの距離
を、円インボリュートの基礎円半径を含む関係式から、
両スクロールのうち、熱膨張率の大きい方のスクロール
の円インボリュートの基礎円半径を熱膨張率の小さい方
のスクロールの円インボリュートの基礎円半径より小さ
く設定し、熱膨張率の大きい方のスクロールの渦巻歯の
任意の点の渦巻中心からの距離を熱膨張率の小さい方の
スクロールの渦巻歯の上記任意の点の渦巻中心からの距
離よりも熱膨張率の差分相当小さくなるように両スクロ
ールの渦巻歯を形成したものである。
A scroll compressor according to the present invention has a circular involute type spiral tooth, and in a scroll compressor including a fixed scroll and an orbiting scroll made of different materials, the distance between an arbitrary point of the spiral tooth and the spiral center is determined. , From the relational expression including the basic circle radius of the circle involute,
Of the two scrolls, the basic circle radius of the circular involute of the scroll with the larger coefficient of thermal expansion is set smaller than the basic circle radius of the circular involute of the scroll with the smaller coefficient of thermal expansion, and the scroll with the larger coefficient of thermal expansion is The distance from the center of the spiral of any point of the spiral tooth is smaller than the distance from the center of the spiral of the scroll tooth of the scroll tooth with the smaller coefficient of thermal expansion by a difference in the coefficient of thermal expansion that is considerably smaller than that of both scrolls. A spiral tooth is formed.

〔作用〕[Action]

この発明におけるスクロール圧縮機は,素材の熱膨張
率の大きい方のスクロールの渦巻歯の形状が相対的に小
さいため,運転中に両スクロールが高温になった場合に
は,両スクロールの渦巻歯形状は理想(同一形状)に近
くなり,歯同士の干渉及びすき間が減少する。
In the scroll compressor according to the present invention, since the scroll teeth of the scroll having the larger coefficient of thermal expansion have a relatively small shape, the scroll teeth shape of both scrolls when the temperature becomes high during operation. Is closer to the ideal shape (same shape), and interference between teeth and clearance are reduced.

〔実施例〕〔Example〕

以下,本発明の一実施例を第1図と第2図について説
明する。本実施例は固定スクロール(1)に鋳鉄,揺動
スクロール(12)にアルミニウムを使用する場合を想定
している。第1図には素材が鋳鉄である固定スクロール
の渦巻歯(1)と素材がアルミニウムである揺動スクロ
ールの渦巻歯(12)を便宜上両スクロールの中心及び位
相を合わせて,重ねて書いてある。
An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In this embodiment, it is assumed that cast iron is used for the fixed scroll (1) and aluminum is used for the orbiting scroll (12). In FIG. 1, the spiral teeth (1) of a fixed scroll whose material is cast iron and the spiral teeth (12) of an orbiting scroll whose material is aluminum are overlapped with the centers and phases of both scrolls aligned for convenience. .

鋳鉄の固定スクロールの渦巻歯(1)の内向面上であ
る点を(1a)とすると,(1a)の中心からの距離L1aで表される。
If the point on the inward surface of the spiral tooth (1) of the cast iron fixed scroll is (1a), the distance L 1a from the center of (1a) is It is represented by

一方アルミニウムの揺動スクロールの渦巻歯(12)の
内向面上の,(1a)に対応する点を(12a)とすると,
(12a)の中心からの距離L12aで表される。ここで, a12<a1 に設定してあるので,アルミニウムの揺動スクロールの
渦巻歯(12)は,鋳鉄の固定スクロールの渦巻歯(1)
に比べて,相対的に小さな形状となっている。
On the other hand, if the point corresponding to (1a) on the inward surface of the spiral tooth (12) of the orbiting scroll of aluminum is (12a),
The distance L 12a from the center of (12a) is It is represented by Since a 12 <a 1 is set here, the spiral teeth (12) of the orbiting scroll of aluminum are the spiral teeth (1) of the fixed scroll of cast iron.
The shape is relatively smaller than that of.

さて,運転中の固定スクロール及び揺動スクロール
は,高温高圧のガスにさらされるため,高温となる。高
温になると,両スクロールは,それらの温度上昇と熱膨
張率にほぼ比例して熱膨張する 第2図に,温度上昇時の本実施例に係るアルミニウム
揺動スクロールの渦巻歯(12b)及びそれとペアで使用
する鋳鉄の揺動スクロールの温度上昇時の渦巻歯(1b)
を両スクロールの中心及び位相を合わせて示す。また,
それらの常温時のものも合わせて示す。
By the way, the fixed scroll and the orbiting scroll during operation are exposed to the high temperature and high pressure gas, and thus become high temperature. At high temperatures, both scrolls thermally expand substantially in proportion to their temperature rise and coefficient of thermal expansion. Fig. 2 shows the spiral teeth (12b) of the aluminum orbiting scroll according to the present embodiment at the time of temperature rise and Spiral teeth (1b) when the temperature of orbiting scroll of cast iron used as a pair rises.
Shows the center and phase of both scrolls together. Also,
Those at room temperature are also shown.

第2図を第6図と比較すると明らかなように,温度上
昇時においては,本実施例に係るアルミニウムの揺動ス
クロールの渦巻歯(12b)は鋳鉄の揺動スクロールの渦
巻歯(1b)とほぼ同一形状となるつまり,アルミニウム
を素材とした揺動スクロールであるにもかかわらず,運
転時,すなわち温度上昇時においては,歯の干渉及び歯
の洩れすき間の原因となる渦巻形状の相違が大幅に是正
される 〔発明の効果〕 この発明によれば、円インボリュートタイプの渦巻歯
を有し、それぞれ材質の異なる固定スクロール及び揺動
スクロールを備えたスクロール圧縮機において、渦巻歯
の任意の点の渦巻中心からの距離を、円インボリュート
基礎円半径を含む関係式から、両スクロールのうち、熱
膨張率の大きい方のスクロールの円インボリュート基礎
円半径を熱膨張率の小さい方のスクロールの円インボリ
ュート基礎円半径より小さく設定し、熱膨張率の大きい
方のスクロールの渦巻歯の任意の点の渦巻中心からの距
離を熱膨張率の小さい方のスクロールの渦巻歯の上記任
意の点に対応する点の渦巻中心からの距離よりも熱膨張
率の差分相当小さくなるように両スクロールの渦巻歯を
形成したので、円インボリュートの基礎円半径を含む渦
巻歯の内向面、外向面を表す関係式である、 但し、 L:スクロール渦巻歯の任意の点の渦巻中心からの半径方
向距離 a:円インボリュートの基礎円半径 φ:任意の点を表す変数で円インボリュートの伸開角 α:歯厚を決定する角度 から、円インボリュートの基礎円半径aを異なるように
設定するだけで、簡単に熱膨張率の差分相当半径方向距
離に差異を有するスクロール渦巻歯が形成でき、また、
揺動スクロールの軽量化のためにアルミニウム、樹脂等
広範に材料が選定できる。
As is apparent from the comparison of FIG. 2 with FIG. 6, when the temperature rises, the spiral teeth (12b) of the aluminum oscillating scroll according to the present embodiment become the spiral teeth (1b) of the cast iron oscillating scroll. Although the scrolls have almost the same shape, that is, although the orbiting scroll is made of aluminum, the difference in the spiral shape that causes tooth interference and tooth leakage gap during operation, that is, when the temperature rises is large. According to the present invention, in the scroll compressor having the circular involute type spiral teeth and provided with the fixed scroll and the orbiting scroll of different materials, respectively, it is possible to reduce From the relational expression including the radius from the center of the spiral to the circle involute base circle radius, the circle involute base circle of the scroll with the larger coefficient of thermal expansion from both scrolls Set the radius smaller than the circular involute base circle radius of the scroll with the smaller coefficient of thermal expansion, and set the distance from the spiral center of the spiral tooth of the scroll with the greater coefficient of thermal expansion to the one with the smaller coefficient of thermal expansion. Since the scroll teeth of both scrolls are formed so that the difference in the coefficient of thermal expansion is considerably smaller than the distance from the center of the spiral at the point corresponding to the above arbitrary point of the scroll teeth of the scroll, the spiral that includes the basic circle radius of the circular involute. It is a relational expression expressing the inward surface and the outward surface of the tooth, However, L: Radial distance from the center of the spiral of any point of the scroll spiral tooth a: Basic circle radius of the circular involute φ: Expansion angle of the circular involute with a variable that represents an arbitrary point α: Angle that determines the tooth thickness Therefore, by only setting the basic circle radius a of the circular involute differently, scroll spiral teeth having a difference in the radial direction distance corresponding to the difference in coefficient of thermal expansion can be easily formed, and
A wide range of materials such as aluminum and resin can be selected to reduce the weight of the orbiting scroll.

これにより、スクロール圧縮機の運転時に熱膨張によ
り、両スクロールの渦巻歯の形状は同じとなり、圧縮室
の形成において渦巻歯どうしの干渉または渦巻歯と渦巻
歯の間に漏れ隙間を生じることなく圧縮室の接点が形成
され、結果として高効率で、音や振動の小さい、しかも
信頼性の高いスクロール圧縮機が得られるという作用効
果を奏する。
Due to this, due to thermal expansion during operation of the scroll compressor, the shape of the spiral teeth of both scrolls becomes the same, and there is no interference between the spiral teeth in the formation of the compression chamber or there is no leakage gap between the spiral teeth. The contact point of the chamber is formed, and as a result, the scroll compressor with high efficiency, low noise and vibration, and high reliability can be obtained.

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

第1図はこの発明の一実施例のアルミニウムの揺動スク
ロールの渦巻歯の形状を,ペアで使用する鋳鉄の固定ス
クロールの渦巻歯の形状と,便宜的に両スクロールの中
心及び位相を合わせて重ねて示した図,第2図は同上動
作の説明図,第3図はスクロール圧縮機の要部斜視図,
第4図〜第7図は従来のスクロール圧縮機の説明図であ
る。 図において,(1),(12)は渦巻歯,(101)は固定
スクロール,(102)は揺動スクロールである。 なお,各図中同一符号は同一または相当部分を示す。
FIG. 1 shows the shape of the spiral teeth of the orbiting scroll of aluminum according to one embodiment of the present invention, for the sake of convenience, the center and phase of both scrolls are matched with the shape of the spiral teeth of the fixed scroll of cast iron used as a pair. FIG. 2 is an overlapping view, FIG. 2 is an explanatory view of the same operation as above, and FIG. 3 is a perspective view of a main part of a scroll compressor,
4 to 7 are explanatory views of a conventional scroll compressor. In the figure, (1) and (12) are spiral teeth, (101) is a fixed scroll, and (102) is an orbiting scroll. In the drawings, the same reference numerals indicate the same or corresponding parts.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 小林 教秀 静岡県静岡市小鹿3丁目18番1号 三菱 電機株式会社静岡製作所内 (56)参考文献 実開 昭59−186495(JP,U) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norihide Kobayashi 3-18-1, Oshika, Shizuoka-shi, Shizuoka Mitsubishi Electric Corporation Shizuoka Works (56) References

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】円インボリュートタイプの渦巻歯を有し、
それぞれ材質の異なる固定スクロール及び揺動スクロー
ルを備えたスクロール圧縮機において、渦巻歯の任意の
点の渦巻中心からの距離を、両スクロールのうち、熱膨
張率の大きい方のスクロールの円インボリュートの基礎
円半径を熱膨張率の小さい方のスクロールの円インボリ
ュート基礎円半径より小さく設定し、上記熱膨張率の大
きい方のスクロールの渦巻歯の任意の点の渦巻中心から
の距離を上記熱膨張率の小さい方のスクロールの上記渦
巻歯の任意の点に対応する渦巻中心からの距離よりも、
熱膨張の差分相当小さくなるように両スクロールの渦巻
歯を形成したことを特徴とするスクロール圧縮機。
1. A spiral involute type spiral tooth,
In scroll compressors with fixed scrolls and orbiting scrolls made of different materials, the distance from the center of the spiral of any point of the spiral teeth is the basis of the circular involute of the scroll with the larger coefficient of thermal expansion. Set the circle radius smaller than the circle involute basic circle radius of the scroll with the smaller coefficient of thermal expansion, and set the distance from the center of the spiral of any spiral tooth of the scroll with the larger coefficient of thermal expansion to the above Than the distance from the spiral center corresponding to any point of the spiral teeth of the smaller scroll,
A scroll compressor in which spiral teeth of both scrolls are formed so that a difference in thermal expansion becomes considerably small.
JP24007788A 1988-09-26 1988-09-26 Scroll compressor Expired - Lifetime JP2679155B2 (en)

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JPH0286979A JPH0286979A (en) 1990-03-27
JP2679155B2 true JP2679155B2 (en) 1997-11-19

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JP3109359B2 (en) * 1993-12-24 2000-11-13 松下電器産業株式会社 Hermetic scroll compressor and method for assembling the same
JP3635794B2 (en) * 1996-07-22 2005-04-06 松下電器産業株式会社 Scroll gas compressor
US6604923B2 (en) * 2001-09-28 2003-08-12 Intel Corporation End seal features for scroll compressors
GB0304285D0 (en) * 2003-02-25 2003-04-02 Boc Group Plc Scroll compressor
WO2021229682A1 (en) * 2020-05-12 2021-11-18 三菱電機株式会社 Scroll compressor

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JPS59186495U (en) * 1983-05-30 1984-12-11 株式会社豊田自動織機製作所 scroll compressor

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