經濟部智慧財產局員工消費合作社印製 486547 A7 B7_ 五、發明說明（1 ) (發明所屬之技術領域） 本發明係關於一種使用於空調系統的氣體壓縮機，特 別是，關於提高空調系統之冷卻效率，及防止因油不足所 產生之潤滑不良者。 (以往之技術） 、 以往，此種氣體壓縮機係如第8圖所示，在一端開口 型之殼1與安裝於該開口端之前頭2所構成的外殻3內， 具備收納壓縮機本體4，及油分離器5等，形成於外殼3 內側與壓縮機本體4之前部之間的空間係形成作爲吸入室 6，又形成於外殼3內側與壓縮機本體4之後部之間的空 間係形成作爲吐出室7。 壓縮機本體4係轉子4 b與轉子軸4 a —體地旋轉時 ，則從吸入室6經由前側塊體4 c將低壓冷媒氣體吸進氣 缸4 d內。與潤滑用油一起壓縮該低壓冷媒氣體，並將此 經由後側塊體4 e吐出至吐出室7側。油分離器5係安裝 於壓縮機本體之後側塊體4e ，將從壓縮機本體4朝吐出 室7側吐出的高壓冷媒氣體分離成氣體成分與油成分。如 此被分離之氣體成分係從吐出室7通過殼1之吐出口 7 a ，如第9圖所示之空調系統8之凝結器9 ，膨脹閥1 0及 蒸發器1 1等之後，由吸入口 6 a回流至吸入室6 ，且再 作爲冷媒氣體與油一起被壓縮，另一方面，油成分係暫時 被儲存在吐出室7底部之儲存部7 b，且與冷媒氣體一起 再被壓縮。 · 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -------------------訂---------線· (請先閲讀背面之注意事項再填寫本頁) -4- 經濟部智慧財產局員工消費合作社印製 486547 A7 •_B7_' 五、發明說明（2 ) 然而，在如上述之以往氣體壓縮機，從壓縮機本體4 所吐出的高壓冷媒氣體係被供應至油分離器5，但在油分 離器5很難將冷媒氣體完全分離成氣體成分與油成分。如 此，未分離之油成分（以下也稱爲「未分離油分」）作爲 油霧而流出至空調系統8之凝結器9及蒸發器1 1等，使 空調系統8之油循環率（以下也簡稱爲「OCR」）變高 ，與原來冷卻沒有直接關係之油會多循環空調系統8內， 冷卻效率變差。油成分流出至空調系統8之凝結器9側時 ，則減少氣體壓縮機內之油，而可產生因油不足的氣體壓 縮機之潤滑不良等之問題。又欲以更高比率分離冷媒氣體 成分與油成分之比率，考量使用不容易溶解冷媒氣體與油 的組合者，但是在此時，從氣體壓縮機所放出之油在蒸發 器1 1等內被冷卻，會有油之粘度上昇而不能回到氣體壓 縮機，而可產生因油不足的氣體壓縮機之潤滑不良等之問 題。 (發明欲解決之課題） 本發明係用以解決上述以往之問題而創作者，其、目的 係在於提供一種適用於提高空調系統之冷卻效率，及防止 因油不足所產生之潤滑不良的氣體壓縮機。 (解決課題所用之手段） 爲了達成上述目的，本發明係具備：與潤滑用油一起 壓縮吸入室之冷媒氣體，並將吐出在吐出室側的壓縮機本 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） --------------------訂---------線 (請先閱讀背面之注意事項再填寫本頁) -5 - 486547 A7 B7_ 五、發明說明（3 ) (請先閱讀背面之注意事項再填寫本頁) 體，及將由上述壓縮機本體吐出之商壓冷媒氣體分離成氣 體成分與油成分的油分離器；上述氣體成分係由上述吐出 室經空調系統之凝結器等回流至上述吸入室，且作爲冷媒 氣體與油一起被再壓縮，上述油成分係暫時被儲存在上述 吐出室底部之儲油部，且與冷媒氣體一起被再壓縮之構造 的氣體壓縮機，其特徵爲：上述吐出室之空間容積係減小 空調系統之油循環率且擴大成必需之大容積俾在氣體壓縮 機內確保充分之油量者。 本發明係具有收納壓縮機本體及油分離器的殼，將形 成在該殼內側與壓縮機本體之前部之間的空間作爲吸入室 。而將該殼內側與壓縮本體之後部之間的空間具備作爲吐 出室；上述吐出室之空間容積之擴大爲將上述殼之內側朝 外側突出所形成，爲其特徵者。 經濟部智慧財產局員工消費合作社印剩衣 本發明係具有複數壓縮機本體與一吐出室，在上述每 一各壓縮機.本體，與油一起壓縮各吸入室之冷媒體，並將 此在油分離器分離成氣體成分與油成分而吐出在上述一吐 出室側；上述氣體成分係由上述一吐出室經空調系統經空 調系統之凝結器等回流至上述吸入室，且作爲冷媒氣體與 油一起被再壓縮，上述油成分係暫時被儲存在上述吐出室 底部之儲油，且與冷媒氣體一起被再壓縮之構造的氣體壓 縮機，其特徵爲：上述一吐出室之空間容積係減小空調系 統之油循環率且在氣體壓縮機內確保充分之油量所必需的 大容積。 本發明係吐出室之空間容積爲壓縮機每旋轉一次之吸 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公楚) " 486547 、 A7 B7 五、發明說明（4) 入氣體排除容積的兩倍以上且1 0倍以下，爲其特徵者。 (請先閱讀背面之注意事項再填寫本頁) 本發明係油與冷媒氣體之組合爲p A G系油與R 2 2 冷媒，PAG系油與R4 0 7 C冷媒，乙醚系油與 R407C冷媒，碳酸鹽系油與R407C冷媒，碳酸鹽 系油與R4 1 0 a冷媒，酯系油與R4 1 0 a冷媒或 PAG系油與R 1 3 4 a冷媒中之任一種，爲其特徵者。 在本發明中，由於吐出室之空間容積如上述地成爲大 容積，而包含在油分離器未分離之油成分（未分離油分） 的高壓冷媒氣體會在吐出室停留較久。因此該未分離油分 以自重掉在吐出室底部之儲油部之比率會增加，而可將未 分離油分對於空調系統之凝結器及蒸發器等之流出量會大 幅度地減少。 經濟部智慧財產局員工消費合作社印製 又在本發明中，所謂油循環率成0 C R係指被塡充於 壓縮機內之油的一部分藉該壓縮機之運轉而被放出至空調 系統時之除了該壓縮機的空調系統內之任意部分的對於冷 媒氣體成分與油成分之混合物整體量之油成分量的比率。 又所謂壓縮機每旋轉一次之吸入氣體排除容積，係指壓縮 機本體藉轉子之旋轉來壓縮冷媒氟體之構造時，由該轉子 旋轉一次時所排除之吸入氣體的該壓縮機之構造與尺寸可 算出的理論上體積。PAG係指聚烯烴乙二醇。 (發明之實施形態）. 以下，依據第1圖及第7圖詳述本發明之氣體壓縮機 的實施形態。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 486547 A7 _____B7 _ 五、發明說明（5 ) (請先閱讀背面之注意事項再填寫本頁) 又由於氣體壓縮機之基本上構成，例如構成氣體壓縮 機具有壓縮機本體4與油分離器5等，壓縮機本體4係與 潤滑用油一起壓縮吸入室6之冷媒氣體，並將此吐出至吐 出室7側，/或油分離器5係構成將由壓縮機本體4所吐出 的高壓冷媒氣體分離成氣體成分與油成分等係與以往同樣 ，故在與這些相同構件賦予相同記號，而省略其詳細說明 〇 表示於第1圖之氣體壓縮機係吐出室之空間容積比以 往之氣體壓縮機（參照第8圖）相比較被擴大而構成作爲 具備大容積之吐出室7者。 經濟部智慧財產局員工消費合作社印製 亦即，表示於同圖之氣體壓縮機，具有壓縮機本體4 及收納油分離器5的外殼3，將形成於該外殼3內側與壓 縮機本體4之前部之間的空間作爲吸入室6，又將形成於 該外殼3內側與壓縮機本體4之後部之間的空間作爲吐出 室7乃與以往同樣，但在表示於同圖之氣體壓縮機中，爲 了將吐出室7之空間容積比以往構成之氣體壓縮機更擴大 ，作爲該擴大之一手段，係使構成吐出室7之內壁的外殼 3內側（殼本體1之後部側內壁面朝外側突出之點。與以 往不同。亦即，在表示於第1圖之氣體壓縮機，外殼3之 後部側係比外殼3之胴體腹部3 a (包圍壓縮機本體4之 外周的中間細小部分）呈鼓出較大之外觀形狀，該鼓出部 分之內側爲大容積之吐出室7。 擴大吐出室7之空間容積，則包含未分離油分（在油 分離器5未分離之油成分）的高壓冷媒氣體係費充分時間 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -8- 486547 A7 B7_ 五、發明說明（6 ) (請先閱讀背面之注意事項再填寫本頁) 通過吐出室7而到達到吐出口 7 a側。如此高壓冷媒氣體 通過吐出室7之時間變較久，則高壓冷媒氣體中之未分離 油分以自重掉在吐出室7底部的儲油部7 b之油量會比以 往增加，可將對於空調系統8之凝結器9側（參照第9圖 )之未分離油分的流入量大幅度地減少，及在氣體壓縮機 內可充分地儲存油。因此，吐出室7係作成比以往更大容 積，惟其容積係擴大至能減小空調系統8內之油循環率且 確保充分之油量所必需的大容積。 以下依據第1圖說明如上所構成的氣體壓縮機之作用 。開始氣體壓縮機之運轉，則吸入室6之冷媒氣體被吸進 壓縮機本體4內，該被吸進之冷媒氣體係在壓縮機本體4 內與油一起被壓縮後，作爲高壓冷媒氣體而被吐出至吐出 室7側，及由壓縮機本體4所吐出之高壓冷媒氣體係經由 油分離器5被分離成氣體成分與油成分，氣體成分係從吐 出室7通過殻1之吐出口 7 a及空調系統之凝結器等後由 吸入口 6 a回到吸入室6，且作爲冷媒氣體與油再被壓縮 ，另一方面，油成分係暫時被儲存在吐出室7底部的儲油 部7 b，且作爲油與冷媒氣體一起再被壓縮爲與以往同樣 經濟部智慧財產局員工消費合作社印製 〇 在該氣體壓縮機中，藉由油分離器5將由壓縮機本體 4所吐出之高壓冷媒氣體完全分離成氣體成分與油成分也 困難，在吐出室7之高壓冷媒氣體中未分離之油成分（未 分離油分）以油霧狀態被包含，惟此種未分離油分中流至 空調系統8之凝結器9側（參照第9圖）之量極少，大部 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -9 - 經濟部智慧財產局員工消費合作社印製 486547 A7 _B7_' 五、發明說明（7 ) 分之未分離油分係掉至吐出室7底部之儲油部7 b。 亦即，表示於第1圖之氣體壓縮機，由於與以往相比 較將吐出室7之空間容積加以擴大者，因而包含未分離油 分之高壓冷媒氣體之吐出室的停留時間，比以往構成之氣 體壓縮機變久而暫時地被保持，故高壓冷媒氣體中之未分 離油分係其大部以自重掉在吐出室7底部的儲油部7 b。 因此，未分離油分對於空調系統8之凝結器9側的流出量 大幅度地減少，該空調系統8中之油循環率變低。如此， 與本來冷卻沒有直接關係之油不會多量地循環在空調系統 8內，可將空調系統8中之油循環率抑制較低，而可提高 冷卻效率。又，可將油充分地儲存在氣體壓縮機內，也可 防止因油不足所產生的氣體壓縮機之潤滑不良。 又，在上述實施形態，藉將外殻3之內側比該外殼3 之胴體腹部3 a朝外側突出，俾擴大吐出室7之空間容積 ，但是，擴大吐出室7之容積係也可採取此以外之方法， 例如將外殼3內部之壓縮機本體4等成爲小型化也可得到 吐出室7之空間容積的相對性擴大。 ' 第3圖係表示本發明的氣體壓縮機之其他實施形態者 。同圖之氣體壓縮機係所謂多壓縮機者，在殻本體1內具 有兩台壓縮機本體4、 4,及分別設於該壓縮機本體4、 4的油分離器5、 5，及共有於壓縮機本體4、 4的一個 吐出室7。因各壓縮機本體4、4之基'本性構成係與表示 於第8圖之氣體壓縮機（以下稱爲「單壓縮機」）的壓縮 機本體4 (參照第1圖）同樣，因此，在與這些相同構件 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） --------------------訂---------線 (請先閱讀背面之注意事項再填寫本頁) -10- 486547 A7 B7 五、發明說明（8) (請先閱讀背面之注意事項再填寫本頁) 賦予相同記號，省略其詳細說明。又該第3圖之多壓縮機 的吐出室7之空間容積，係相當於一台之單壓縮機的吐出 室7之兩個份量。 在第3圖之多壓縮機中，每一各壓縮機本體4、4， 分別與油一起壓縮吸入室之冷媒氣體。如此，該壓縮之高 壓冷媒氣體係在油分離器5、 5分離成氣體成分與油成分 之後，吐出於共有之一個吐出室7側。 亦即，在第3圖之多壓縮機中，兩台壓縮機本體4、 4共用一個吐出室7作爲高壓冷媒氣體之吐出處，惟本實 施形態係將此種吐出室7 (以下稱爲「共有吐出室」）之 空間容積，成爲減小空調系統之油循環率且在氣體壓縮機 內確保充分油量所必需之大容積者。 又，對於吐出至共有吐出室7之冷媒氣體中之氣體成 分，係通過連通於共有吐出室7之殼1之一個吐出口 7 a 與空調系統8之凝結器1 0等而由吸入口 6 a回至吸入室 6，且作爲冷媒氣體與油一起再被壓縮。又對於吐出至共 有吐出室7之冷媒氣體中之油成分，係暫時被儲存在共有 吐出室7底部的儲油部7 b，且與冷媒氣體再被壓縮。 經濟部智慧財產局員工消費合作社印製 相比較並排設置兩台表示於第8圖之單壓縮機的構造 者，與表示於第3圖之一台多壓縮機時，由第2圖與第3 圖可知，由於第3圖之多壓縮機者，將殼1之吐出口 7 a 較遠地配置距油分離器5，因此可增加高壓冷媒氣體停留 在殼1內之時間，可增多高壓冷媒氣體中之未分離油分之 自重落下量，因而可增大油之分離性能。 -11 · 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 486547 經濟部智慧財產局員工消費合作社印製 A7 B7__ 五、發明說明（9 ) 相比較在表示於第3圖之一台多壓縮機中，僅運轉兩 具壓縮機本體4、4中之任何一具時（單邊之運轉），與 並排設置兩台表示於第8圖之單壓縮機之構造中，僅運轉 一台時，則前者之壓縮機具較佳之油分離性能。此乃由於 多壓縮機之一方有較大之殼本體1內之空間容積，亦即， 多壓縮機之共有吐出室7係相當於多壓縮機之吐出室7的 兩分量，在多壓縮機與單壓縮機相比較，高壓冷媒氣體停 留在殼1內之時間變久。 .又如本實施形態地擴大多壓縮機之共有吐出室7之空 間容積時，由於包含未分離油分之高壓冷媒氣體在共有吐 出室7之停留時間會更久而被暫時保留，因此高壓冷媒氣 體中之未分離油分以自重掉至共有吐出室7底部之儲油部 7 b的量會更多，結果，未分離油分對於空調系統之凝結 器側之流入量大幅度地減少，與本來冷卻沒有直接關係之 ‘油不會多循環空調系統內，可將空調系統之油循環率抑制 較低，而提高冷卻效率。又可將油充分地儲存在氣體壓縮 機內，也可防止因油不足所產生的氣體壓縮機之潤滑不良 〇 第5圖係表示在單壓縮機時，吐出室空間密積對於壓 縮機每旋轉一次之吸入氣體排除容積之比（吐出室空間容 積/壓縮機每旋轉一次之吸入氣體排除容積）與OCR ( 油循環率）之關係者。第6圖係表示在多壓縮機時，吐出 室空間容積對於壓縮機每旋轉一次之吸入氣體排除容積之 比與〇C R之關係者。又，第5圖與第6圖之油與冷媒氣 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） ---------------------訂---------線 (請先閱讀背面之注意事項再填寫本頁) •12· 486547 A7 B7 五、發明說明（ι〇) 體之組合係均依PAG油與R2 2冷媒者。 (請先閱讀背面之注意事項再填寫本頁) 以使用第1圖說明壓縮機每旋轉一次之吸入氣體排除 容積，爲當轉子4 b —旋轉時從吸入室6被吸入壓縮機本 體4之底壓冷媒氣體的該壓縮機本體4之構造與尺寸可算 出的理論性體積。又，OCR係如上所述，塡充於壓縮機 內之油一部分藉由該壓縮機之運轉被放出至空氣系統中時 的除了該壓縮機以外之空調系統內之任意部位的冷媒氣體 成分與油成分之混合物全體的油成分量之比率。一般該 〇C R係在凝結器與膨脹閥之間的冷媒成爲高壓之液狀態 之部分加以實測。 然而，0 C R係期望在某一數値以下。亦即，考量例 如在空調系統之蒸發器，係將從氣體壓縮機被凝結器凝結 ，而在膨脹閥被減壓的液冷媒經管路內實行熱交換，惟〇 C R過大時，因油過多地混入而發生在蒸發器管路內壁之 較厚油膜，會阻礙液冷媒與管壁之傳墊，而熱交換率降低 〇 經濟部智慧財產局員工消費合作社印製 由如上之〇C R大小與空調系統之熱交換效率之關係 ，可知0 C R係實驗上以4 %以下爲適當値，亦即可將空 調系統之熱交換效率成爲最高之數値。還有多壓縮機係在 封入單壓縮機之數倍至數十倍冷媒量的空調系統所使用， 因而考量構造上可封入在空調系統之油量及封入油所需費 用，可知〇C R係以1 %以下較適當値。又，〇 C R係隨 氣體壓縮機之旋轉數而變化，惟因氣體壓縮機之常用旋轉 數爲約3000 r pm，故在該旋轉數附近使OCR成爲 -13 - 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 486547 經濟部智慧財產局員工消費合作社印製 A7 _____B7___ 五、發明說明（ιυ 適當値極重要。 如此由第5圖可知、在單壓縮機，當其旋轉數爲 3000 r pm時，欲使OCR成爲4%以下之適當値， 乃吐出室7之空間容積爲壓縮機每旋轉一次之吸入氣體排 除容積的兩倍以上。又由第6圖可知，在多壓縮機，當其 旋轉數爲3 0 0 0 r pm時，欲使〇CR成爲1%以下之 適當値’乃吐出室7之空間容積爲壓縮機每旋轉一次之吸 入氣fi排除容積的1 0倍以上。亦即，欲將〇 C R成爲適 當者則愈增大吐出室7之空間容積愈佳，惟若過大則實際 上製造壓縮機或是安裝於空氣系統時，成爲製造費用增加 或是安裝不方便。由這些方面來考量，則在單壓縮機中， 吐出室7之空間容積係壓縮機每旋轉一次之吸入氣體排除 容積之兩倍以上且1 0倍以下最理想，而在多壓縮機中， 吐出室7之空間容積係每旋轉一次之吸入氣體排除容積之 1 0倍以上且3 0倍以下最理想。 又〇C R係也藉油與冷媒氣體之溶解程度而變更。亦 即，冷媒氣體容易溶解時，也藉由設於氣體壓縮機內之油 分離器5不容易分離成爲氣體成分與油成分，空調系統8 內之OCR容易變高。相反地，冷媒氣體不容易溶解時， 也藉由設於氣體壓縮機內之油分離器5容易分離成爲氣體 成分與油成分，使空調系統8內之〇 CR容易變低。因此 ，欲降低0 C R，考量隨著使用之冷媒氣體選擇不容易溶 解冷媒氣體之油就可以。然而，冷媒氣體不容易溶解於油 中時，雖氣體壓縮機放出至空調系統8內之油成分在每一 --------------------訂---------線 jjjjj (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -14· 486547 A7 B7 五、發明說明（12) (請先閱讀背面之注意事項再填寫本頁) 單位時間較少者，由於從膨脹閥1 〇之出口至蒸發器11 內爲低壓低溫，因此未溶於冷媒氣體之油粘度上昇，有油 不容易回到氣體壓縮機之問題。若油未回到氣體壓縮機， 則用以潤滑壓縮機本體4之儲油部7 b之油量隨著運轉會 減少，而產生壓縮機本體4之潤滑不足。 經濟部智慧財產局員工消費合作社印製 因此，爲了不會產生壓縮機本體4之潤滑不足而得到 最適當之0 C R，在氣體壓縮機内極力分離冷媒氣體成分 與油成分，同時冷媒氣體與油在容易溶解之關係爲極重要 。第7圖係表示在油中溶解1〇%冷媒氣體時之冷媒氣體 與油之組合不同所產生之溫度與壓力的關係者。在第7圖 中，以G。表示之線係表示在油中溶解1 〇%冷媒氣體時之 油是否容易或不容易回到氣體壓縮機之境界，表示成爲組 合冷媒氣體與油之使用可否判斷基準之溫度與壓力的關係 。亦即，在超過基準値Go之範圍（以Go表示之線的左上 範圍）中在油中溶解10%冷媒氣體的冷媒氣體與油之組 合，特別是由於空調系統之蒸發器等之低壓低溫部分的壓 力溫度成爲以Go表示之線的右下範圍，因此表示在油中僅 溶解未滿1 0%冷媒氣體，油之粘度變高而油不容易回到 氣體壓縮機。相反地，在基準値Go以下之範圍（以Go表 示之線的右下範圍）中在油中溶解10%冷媒氣體的冷媒 氣體與油之組合，在蒸發器等低壓低溫部分也有冷媒氣體 1 0 %以上溶解在油中，表示冷媒氣體容易溶解而油容易 回到氣體壓縮機。 作爲油與冷媒氣體之組合有各種組合，惟成爲第7圖 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -15- 486547 經濟部智慧財產局員工消費合作社印5衣 A7 B7__ 五、發明說明（13) 之基準値G。以下之容易溶解之組合係如同圖所示，有（1 )PAG系油之PAG (聚烯烴乙二醇）1油與R2 2冷 媒，（2) PAG系油之PAG2油與R407C冷媒， (3)乙醯系油之乙醚油1與R407C冷媒，（4)碳 酸鹽系油之碳酸鹽1油與R407C冷媒，（5)碳酸鹽 系油之碳酸鹽2油與R410a冷媒，（6)酯系油之酯 1油與R407C，（7)酯系油之酯2油與R41〇a 冷媒，（8)?厶0系油之？八02油與尺1343，（ 9)?八〇系油之？八〇3油與尺1343冷媒，（10 )PAG系油之PAG4油與R134a冷媒。由第7圖 可知，此等油與冷媒之組合中，特別是（1 )與（8 )之 組合最容易溶解。又在第7圖未表示，作爲不容易溶解超 過基準値g 〇之油與冷媒氣體之組合，有鏈烷烴系油與R 2 2冷媒，環烷系油與R 1 3 4 a冷媒，烷基苯系油與 R407C冷媒等。 又，在上述實施形態，係說明具備兩台壓縮機本體之 多壓縮機，惟本發明係也可適用在具有兩台以上之壓縮機 本體的多壓縮機。 (發明之效果） 在本發明之氣體壓縮機，如上所述，可將吐出室之空 間容積擴大成減小空調系統之油循環率且在氣體壓縮機內 確保充分之油量的所需的大容積者。如此，由於包含在油 分離器未分離之油成分（未分離油分）的高壓冷媒氣體之 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） ------------- T-------訂---------線 (請先閱讀背面之注意事項再填寫本頁) -16 - 經濟部智慧財產局員工消費合作社印製 486547 A7 • _B7 ___ 五、發明說明（14 ) 吐出室停留時間變久，因此，增加該未分離油分以自重掉 至吐出室底部之儲油部的比率，未分離油分對於空調系統 之凝結器側之流入量大幅度地減少，而與本來冷卻沒有直 接關係之油不會多循環空調系統內，可提高冷卻效率。又 即使冷媒氣體與油爲容易溶解而不容易分離之組合者.，也 可減小空調系統內之油循環率，而在氣體壓縮機內充分地 可儲存油，具有也可防止因油不足所產生的氣體壓縮機之 潤滑不良等之效果。 (圖式之簡單說明） 第1圖係表示本發明之氣體壓縮機之一實施形態（單 壓縮機）的縱剖面圖。 第2圖係表示第1圖的A箭視圖。 第3圖係表示從平面觀看本發明之氣體壓縮機之其他 實施形態（多壓縮機）的局部切斷圖。 第4圖係表示第3圖的A—A線剖面圖。 第5圖係表示圖示於第1圖之單壓縮機時的吐出室空 間對於壓縮機每旋轉一次之吸入氣體排除容積的比率與 OCR之關係的說明圖。 第6圖係表示圖示於第3圖之多壓縮機時的吐出室空 間對於壓縮機每旋轉一次之吸入氣體排除容積的比率與 0 C R之關係的說明圖。 第7圖係表示在油中溶解1 0 %冷媒氣體時的因冷媒 氣體與油之組合不同所產生之溫度與壓力之關係的說明圖 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） --------------------訂---------線 (請先閱讀背面之注意事項再填寫本頁) -17- 486547 A7 B7_ 五、發明說明（15 ) 〇 第8圖係表示以往之氣體壓縮機的剖面圖。 第9圖係表示空調系統的說明圖。 (記號之說明） 1 :殼，2 :前頭，3 :外殼，3 a :胴體腹部，4 :壓縮機本體，4 a :轉子軸，4 b :轉子，4 c :前側 塊體，4d :氣缸，4e :後側塊體，5 :油分離器，6 :吸入室，6 a :吸入‘口，7 :吐出室，7a :吐出口， 7b :儲油部，8 :空調系統，9 :凝結器，10 :膨脹 閥，1 1 :蒸發器，700 :共有吐出室。 --------------------訂---------線 (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -18·Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 486547 A7 B7_ V. Description of the invention (1) (Technical field to which the invention belongs) The present invention relates to a gas compressor used in an air conditioning system, and in particular, to improve the cooling of the air conditioning system Efficiency, and prevent poor lubrication caused by insufficient oil. (Conventional technology) In the past, as shown in FIG. 8, this type of gas compressor is provided with a housing for housing the compressor 1 in an open-end casing 1 and a housing 3 formed by a head 2 mounted on the open end. 4, and oil separator 5, etc., the space formed between the inside of the casing 3 and the front of the compressor body 4 is formed as the suction chamber 6, and the space between the inside of the casing 3 and the rear of the compressor body 4 is formed. Formed as a discharge chamber 7. When the compressor body 4 rotates the rotor 4 b and the rotor shaft 4 a integrally, the low-pressure refrigerant gas is sucked into the cylinder 4 d from the suction chamber 6 through the front block 4 c. This low-pressure refrigerant gas is compressed together with the lubricating oil, and is discharged to the discharge chamber 7 through the rear block 4e. The oil separator 5 is mounted on the block 4e behind the compressor body, and separates the high-pressure refrigerant gas discharged from the compressor body 4 toward the discharge chamber 7 into a gas component and an oil component. The gas component thus separated is passed from the discharge chamber 7 through the discharge outlet 7 a of the shell 1, as shown in FIG. 9, the condenser 9 of the air conditioning system 8, the expansion valve 10 and the evaporator 11, etc., and then from the suction port. 6 a returns to the suction chamber 6 and is compressed together with the oil as refrigerant gas. On the other hand, the oil component is temporarily stored in the storage portion 7 b at the bottom of the discharge chamber 7 and is compressed together with the refrigerant gas. · This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) ------------------- Order --------- Line · (Please read the precautions on the back before filling out this page) -4- Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 486547 A7 • _B7_ 'V. Description of the Invention (2) However, in the conventional gas compressor as described above, The high-pressure refrigerant gas system discharged from the compressor body 4 is supplied to the oil separator 5, but it is difficult to completely separate the refrigerant gas into a gas component and an oil component in the oil separator 5. In this way, the unseparated oil component (hereinafter also referred to as "unseparated oil component") flows out as oil mist to the condenser 9 and the evaporator 11 of the air-conditioning system 8, so that the oil circulation rate of the air-conditioning system 8 (hereinafter also simply referred to as "OCR") becomes higher, and the oil that is not directly related to the original cooling will be in the multi-cycle air-conditioning system 8 and the cooling efficiency will be deteriorated. When the oil component flows out to the condenser 9 side of the air-conditioning system 8, the oil in the gas compressor is reduced, and problems such as poor lubrication of the gas compressor due to insufficient oil may occur. If you want to separate the ratio of the refrigerant gas component to the oil component at a higher ratio, consider using a combination that does not easily dissolve the refrigerant gas and oil, but at this time, the oil released from the gas compressor is trapped in the evaporator 11 etc. When cooling, there is a problem that the viscosity of the oil rises and cannot return to the gas compressor, and problems such as poor lubrication of the gas compressor due to insufficient oil may occur. (Problems to be Solved by the Invention) The present invention was created by the present invention to solve the above-mentioned conventional problems, and its purpose is to provide a method for improving the cooling efficiency of air-conditioning systems and preventing poor gas compression caused by insufficient oil. machine. (Means for solving problems) In order to achieve the above-mentioned object, the present invention is provided with a compressor that compresses a refrigerant gas in a suction chamber together with a lubricating oil, and discharges the compressor on a side of a discharge chamber. Specifications (210 X 297 mm) -------------------- Order --------- Line (Please read the precautions on the back before filling in this Page) -5-486547 A7 B7_ V. Description of the invention (3) (Please read the precautions on the back before filling out this page), and separate the commercial refrigerant gas discharged from the compressor body into gas and oil components. Oil separator; the gas composition is returned from the discharge chamber to the suction chamber through a condenser of an air conditioning system, etc., and is recompressed together with the oil as refrigerant gas. The oil composition is temporarily stored in a storage at the bottom of the discharge chamber. The gas compressor of the oil part and recompressed together with the refrigerant gas is characterized in that the space volume of the above-mentioned discharge chamber is to reduce the oil circulation rate of the air-conditioning system and expand it to the necessary large volume. To ensure sufficient oilThe present invention has a casing for housing a compressor body and an oil separator, and a space formed between the inside of the casing and the front part of the compressor body is used as a suction chamber. The space between the inside of the shell and the back of the compression body is provided as a discharge chamber; the volume of the space of the discharge chamber is enlarged by protruding the inside of the shell to the outside, which is characteristic. The present invention relates to a plurality of compressor bodies and a discharge chamber. In each of the above compressors and bodies, the cold medium of each suction chamber is compressed together with the oil, and this is stored in the oil. The separator is separated into a gas component and an oil component and is discharged on the side of the above-mentioned one discharge chamber; the gas component is returned to the above-mentioned suction chamber from the one discharge chamber through the air-conditioning system through the condenser of the air-conditioning system, etc., and serves as refrigerant gas together with the oil After being compressed, the oil component is a gas compressor that is temporarily stored in the bottom of the discharge chamber and is recompressed together with the refrigerant gas. It is characterized in that the space volume of the discharge chamber is reduced by air conditioning. The oil circulation rate of the system and the large volume necessary to ensure a sufficient oil quantity in the gas compressor. The space volume of the discharge chamber of the present invention is the size of the suction paper for each rotation of the compressor. The size of the paper is applicable to the Chinese National Standard (CNS) A4 (210 X 297). Quot; 486547, A7 B7 5. Description of the invention Excluding the volume of more than twice and less than 10 times is its characteristic. (Please read the notes on the back before filling this page) The combination of the oil and refrigerant gas of the present invention is p AG oil and R 2 2 refrigerant, PAG oil and R 4 0 7 C refrigerant, ether oil and R407C refrigerant, Carbonate oil and R407C refrigerant, carbonate oil and R4 1 0 a refrigerant, ester oil and R4 1 0 a refrigerant, or PAG oil and R 1 3 4 a refrigerant are any of them. In the present invention, since the space volume of the discharge chamber becomes large as described above, the high-pressure refrigerant gas containing the oil component (unseparated oil component) which is not separated in the oil separator stays in the discharge chamber for a long time. Therefore, the ratio of the unseparated oil component falling to the oil storage portion at the bottom of the discharge chamber by its own weight will increase, and the outflow of the unseparated oil component to the condenser and evaporator of the air conditioning system will be greatly reduced. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs and in the present invention, the so-called oil circulation rate of 0 CR means that when a part of the oil filled in the compressor is discharged to the air-conditioning system by the operation of the compressor The ratio of the amount of the oil component to the entire amount of the mixture of the refrigerant gas component and the oil component in any part of the air conditioning system of the compressor. The so-called exhaust gas exhaust volume per compressor rotation refers to the structure and size of the compressor which sucks out the gas when the rotor rotates once to compress the structure of the refrigerant fluorine by the rotation of the rotor. Calculated theoretical volume. PAG means polyolefin glycol. (Embodiment of the invention) Hereinafter, an embodiment of the gas compressor of the present invention will be described in detail with reference to Figs. 1 and 7. This paper size applies to China National Standard (CNS) A4 specification (210 X 297 mm) 486547 A7 _____B7 _ V. Description of the invention (5) (Please read the precautions on the back before filling this page) Also because of the basic of gas compressor For example, the gas compressor has a compressor body 4 and an oil separator 5, and the compressor body 4 compresses the refrigerant gas in the suction chamber 6 together with the lubricating oil and discharges the refrigerant gas to the discharge chamber 7 side. The oil separator 5 is configured to separate the high-pressure refrigerant gas discharged from the compressor body 4 into a gas component and an oil component. The components are the same as in the past. Therefore, the same symbols are given to the same components, and detailed descriptions are omitted. The space capacity of the gas compressor in the figure is larger than that of a conventional gas compressor (refer to FIG. 8), and is constituted as a gas chamber having a large capacity of the discharge chamber 7. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, that is, the gas compressor shown in the same figure, which has a compressor body 4 and a housing 3 containing an oil separator 5 will be formed on the inside of the housing 3 and before the compressor body 4 The space between the parts is the suction chamber 6, and the space formed between the inside of the housing 3 and the rear part of the compressor body 4 is the same as the discharge chamber 7, but in the gas compressor shown in the same figure, In order to expand the space volume of the discharge chamber 7 compared with the conventionally-designed gas compressor, as one of the means of expansion, the inside of the casing 3 (the inner wall surface of the rear side of the casing body 1 protrudes to the outside) The point is different from the past. That is, in the gas compressor shown in FIG. 1, the rear side of the casing 3 is more drummed than the carcass abdomen 3 a of the casing 3 (the middle part surrounding the outer periphery of the compressor body 4). A large appearance shape is formed, and the inside of the bulging part is a large-volume discharge chamber 7. When the space volume of the discharge chamber 7 is enlarged, high-pressure cooling including unseparated oil components (oil components not separated in the oil separator 5) is performed. Gas system fee sufficient time This paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 mm) -8-486547 A7 B7_ V. Description of invention (6) (Please read the precautions on the back before filling this page) Pass through the discharge chamber 7 to reach the discharge outlet 7a side. In this way, the time for the high-pressure refrigerant gas to pass through the discharge chamber 7 becomes longer, and the unseparated oil in the high-pressure refrigerant gas falls by its own weight on the oil storage portion 7 b at the bottom of the discharge chamber 7. The amount of oil will increase as compared with the past, and the inflow of unseparated oil into the condenser 9 side of the air conditioning system 8 (see Figure 9) can be greatly reduced, and the oil can be stored in the gas compressor sufficiently. The discharge chamber 7 has a larger volume than before, but its volume is enlarged to a large volume necessary to reduce the oil circulation rate in the air-conditioning system 8 and ensure a sufficient oil amount. The following description will be made based on the first figure The role of the gas compressor. When the operation of the gas compressor is started, the refrigerant gas in the suction chamber 6 is sucked into the compressor body 4, and the sucked refrigerant gas system is compressed together with the oil in the compressor body 4, Make The high-pressure refrigerant gas is discharged to the discharge chamber 7 side, and the high-pressure refrigerant gas system discharged from the compressor body 4 is separated into a gas component and an oil component through an oil separator 5. The gas component is passed from the discharge chamber 7 through the shell 1 The outlet 7 a and the condenser of the air-conditioning system return to the suction chamber 6 from the suction port 6 a and are compressed as refrigerant gas and oil. On the other hand, the oil component is temporarily stored in the storage at the bottom of the discharge chamber 7 The oil part 7 b is compressed together with the oil and the refrigerant gas to be printed by the consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs in the same manner as in the past. In this gas compressor, the oil separator 5 will spit out the compressor body 4 It is also difficult to completely separate the high-pressure refrigerant gas into gas components and oil components. Unseparated oil components (unseparated oil components) in the high-pressure refrigerant gas in the discharge chamber 7 are contained in an oil mist state, but this unseparated oil component flows to the air conditioner. The volume of the condenser 9 side of the system 8 (refer to Figure 9) is very small. Most of the paper sizes apply the Chinese National Standard (CNS) A4 specification (210 X 297 mm). -9-Intellectual Property Bureau, Ministry of Economic Affairs Printed by the Employee Consumption Cooperative 486547 A7 _B7_ 'V. Description of the invention (7) The unseparated oil fraction is dropped to the oil storage section 7 b at the bottom of the discharge chamber 7. That is, the gas compressor shown in FIG. 1 has a larger space than the conventional one, so the residence time of the discharge chamber containing the high-pressure refrigerant gas without oil separation is longer than that of the conventional gas The compressor is temporarily held for a long time, so the unseparated oil in the high-pressure refrigerant gas is a large part of which falls by its own weight in the oil storage portion 7 b at the bottom of the discharge chamber 7. Therefore, the outflow of unseparated oil to the condenser 9 side of the air-conditioning system 8 is greatly reduced, and the oil circulation rate in the air-conditioning system 8 is reduced. In this way, the oil that is not directly related to the original cooling will not be circulated in the air-conditioning system 8 in a large amount, the oil circulation rate in the air-conditioning system 8 can be suppressed low, and the cooling efficiency can be improved. In addition, the oil can be sufficiently stored in the gas compressor, and the lubrication failure of the gas compressor due to insufficient oil can be prevented. Furthermore, in the above-mentioned embodiment, the inner volume of the outer casing 3 is protruded to the outer side than the carcass abdomen 3 a of the outer casing 3 to enlarge the volume of the ejection chamber 7. However, the volume of the enlarged ejection chamber 7 may be other than that. In the method, for example, the compressor body 4 in the housing 3 is reduced in size, and the relative expansion of the space volume of the discharge chamber 7 can be obtained. 'FIG. 3 shows another embodiment of the gas compressor of the present invention. The gas compressor of the same figure is a so-called multi-compressor, which has two compressor bodies 4, 4, and oil separators 5, 5, which are provided in the compressor body 4, 4, respectively, and share the same One discharge chamber 7 of the compressor bodies 4 and 4. Since the basic constitution of each compressor body 4 and 4 is the same as that of the compressor body 4 (refer to FIG. 1) of the gas compressor (hereinafter referred to as a “single compressor”) shown in FIG. 8, The same components as those of this paper are applicable to China National Standard (CNS) A4 (210 X 297 mm) -------------------- Order ------ --- line (please read the notes on the back before filling this page) -10- 486547 A7 B7 V. Description of the invention (8) (please read the notes on the back before filling this page) Give the same mark and omit its details Instructions. The volume of the discharge chamber 7 of the multi-compressor shown in FIG. 3 corresponds to two portions of the discharge chamber 7 of a single compressor. In the multi-compressor shown in FIG. 3, each compressor body 4, 4 compresses the refrigerant gas sucked into the chamber together with the oil. In this way, the compressed high-pressure refrigerant gas system is separated into a gas component and an oil component by the oil separators 5, 5 and then discharged to a common discharge chamber 7 side. That is, in the multi-compressor shown in FIG. 3, two compressor bodies 4, 4 share a discharge chamber 7 as a discharge place of the high-pressure refrigerant gas. However, in this embodiment, such a discharge chamber 7 (hereinafter referred to as " The space volume of the common discharge room ") becomes the large volume necessary to reduce the oil circulation rate of the air-conditioning system and ensure a sufficient amount of oil in the gas compressor. The gas component in the refrigerant gas discharged to the common discharge chamber 7 is passed through a suction port 6 a through a discharge port 7 a connected to the case 1 of the common discharge chamber 7 and a condenser 10 of the air conditioning system 8. It returns to the suction chamber 6 and is compressed together with the oil as a refrigerant gas. The oil component in the refrigerant gas discharged to the common discharge chamber 7 is temporarily stored in the oil storage portion 7b at the bottom of the common discharge chamber 7, and is compressed with the refrigerant gas. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, compared with the construction of two single compressors shown in Figure 8 side by side, and the multiple compressors shown in Figure 3, from Figures 2 and 3 As can be seen from the figure, since there are many compressors in FIG. 3, the outlet 7a of the casing 1 is arranged far away from the oil separator 5, so the time during which the high-pressure refrigerant gas stays in the casing 1 can be increased, and the high-pressure refrigerant gas can be increased. The weight of the unseparated oil drops by its own weight, so the separation performance of the oil can be increased. -11 · This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) 486547 Printed by A7 B7__, an employee consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. The description of the invention (9) is shown in Figure 3 in comparison In a multi-compressor, when only one of the two compressor bodies 4, 4 is operated (single-sided operation), and two single compressors shown in FIG. 8 are arranged side by side, only When running one, the former compressor has better oil separation performance. This is because one of the multiple compressors has a larger space volume in the shell body 1, that is, the common discharge chamber 7 of the multiple compressors is equivalent to the two components of the discharge chamber 7 of the multiple compressors. Compared with a single compressor, the high-pressure refrigerant gas stays in the casing 1 for a longer time. When the space volume of the common discharge chamber 7 of the multi-compressor is enlarged as in this embodiment, the high-pressure refrigerant gas containing unseparated oil will be retained for a longer time in the common discharge chamber 7, and therefore the high-pressure refrigerant gas will be temporarily retained. The amount of unseparated oil in the oil storage portion 7 b dropped to the bottom of the common discharge chamber 7 by its own weight will be larger. As a result, the inflow of the unseparated oil to the condenser side of the air-conditioning system is greatly reduced, which is not the same as the original cooling Directly related to the oil will not be in the multi-cycle air-conditioning system, the oil circulation rate of the air-conditioning system can be suppressed lower, and the cooling efficiency can be improved. The oil can be fully stored in the gas compressor, and the lubrication failure of the gas compressor due to insufficient oil can also be prevented. Figure 5 shows that when the single compressor is used, the dense space of the discharge chamber space for each rotation of the compressor The relationship between the ratio of the volume of the exhaust gas exhausted at one time (the volume of the discharge chamber space / the volume of the exhaust gas exhausted per revolution of the compressor) and the OCR (oil circulation rate). Fig. 6 is a graph showing the relationship between the ratio of the volume of the discharge chamber space to the volume of the exhaust gas exhausted per rotation of the compressor and 0 C R when there are multiple compressors. In addition, the oil and refrigerant gas in Figure 5 and Figure 6 are in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm). ---- Order --------- line (please read the notes on the back before filling this page) • 12 · 486547 A7 B7 V. Description of the invention (ι〇) The combination of the body is based on PAG oil With R2 2 refrigerant. (Please read the precautions on the back before filling this page) Use the first figure to illustrate the suction gas exhaust volume for each rotation of the compressor, which is drawn into the bottom of the compressor body 4 from the suction chamber 6 when the rotor 4 b is rotated. The theoretical volume of the structure and size of the compressor body 4 that is pressurized with the refrigerant gas can be calculated. The OCR is as described above. When a part of the oil filled in the compressor is discharged into the air system by the operation of the compressor, the refrigerant gas component and oil in any part of the air-conditioning system other than the compressor are discharged. The ratio of the amount of the oil component in the mixture of the components. Generally, the OCR is measured when the refrigerant between the condenser and the expansion valve becomes a high-pressure liquid. However, 0 C R is expected to be a certain number or less. That is to consider, for example, in the evaporator of the air conditioning system, the condensate will be condensed from the gas compressor, and the liquid refrigerant decompressed by the expansion valve will perform heat exchange through the pipeline. The thicker oil film that occurs on the inner wall of the evaporator pipe will prevent the transmission of liquid refrigerant and the wall of the pipe, and the heat exchange rate will be reduced. Printed by the above-mentioned 〇CR size and air conditioner. The relationship between the heat exchange efficiency of the system, it can be known that 0 CR is experimentally appropriate to be less than 4%, that is, the heat exchange efficiency of the air conditioning system can be the highest. Many compressors are used in air-conditioning systems that contain several to several tens of times the amount of refrigerant in a single compressor. Therefore, considering the amount of oil that can be sealed in the air-conditioning system and the cost of sealing the oil, it can be seen that CR is based on Less than 1% is more appropriate. In addition, 〇CR varies with the number of revolutions of the gas compressor, but because the common number of revolutions of the gas compressor is about 3000 r pm, the OCR is set to -13 near this number of revolutions-This paper scale applies Chinese national standards ( CNS) A4 specification (210 X 297 mm) 486547 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 _____B7___ V. Description of the invention (ιυ Properly appropriate is extremely important. As can be seen from Figure 5, in a single compressor, when it rotates When the number is 3000 r pm, it is appropriate to make the OCR less than 4%. The space volume of the discharge chamber 7 is more than twice the volume of the suction gas exhaustion per one rotation of the compressor. As can be seen from Figure 6, When the number of rotations of the compressor is 3 0 0 0 r pm, it is appropriate to make 〇CR less than 1%. The space volume of the discharge chamber 7 is 1 0 of the exhaust volume fi of the compressor for each rotation of the compressor. That is, the larger the volume of the discharge chamber 7 is, the better the 〇CR becomes. However, if it is too large, the compressor is actually manufactured or installed in the air system, which increases the manufacturing cost or installation. inconvenient. Considering these aspects, in a single compressor, the space volume of the discharge chamber 7 is more than twice and not more than 10 times the volume of the suction gas exhaustion per one rotation of the compressor, and in a multiple compressor, the discharge chamber The space volume of 7 is more preferably 10 times to 30 times the volume of the exhaust gas exhaustion per rotation. CR is also changed by the degree of solubility of oil and refrigerant gas. That is, when the refrigerant gas is easily dissolved Also, the oil separator 5 provided in the gas compressor is not easily separated into a gas component and an oil component, and the OCR in the air-conditioning system 8 is easily increased. On the contrary, when the refrigerant gas is not easily dissolved, it is also provided by The oil separator 5 in the gas compressor is easily separated into a gas component and an oil component, so that the 0CR in the air-conditioning system 8 is easily reduced. Therefore, to reduce the 0CR, consider that it is not easy to dissolve the refrigerant gas with the choice of the refrigerant gas used Oil can be. However, when the refrigerant gas is not easily dissolved in the oil, although the oil component released by the gas compressor into the air-conditioning system 8 is in every --- --- Order --------- line j jjjj (Please read the notes on the back before filling out this page) This paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) -14 · 486547 A7 B7 V. Description of the invention (12) (Please read first Note on the back, please fill in this page again.) For those with less unit time, the viscosity of the oil that is not dissolved in the refrigerant gas increases due to the low pressure and low temperature from the outlet of the expansion valve 10 to the evaporator 11. Compressor problems. If the oil does not return to the gas compressor, the amount of oil used to lubricate the oil storage section 7 b of the compressor body 4 will decrease with operation, resulting in insufficient lubrication of the compressor body 4. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. Therefore, in order to avoid the lack of lubrication of the compressor body 4 to obtain the most appropriate 0 CR, the refrigerant gas component and the oil component are separated in the gas compressor as much as possible. The relationship of easy dissolution is extremely important. Fig. 7 is a graph showing the relationship between the temperature and the pressure generated when the combination of the refrigerant gas and the oil is different when 10% of the refrigerant gas is dissolved in the oil. In Figure 7, G is used. The indicated line indicates whether the oil is easy or not easy to return to the state of the gas compressor when 10% of the refrigerant gas is dissolved in the oil, and indicates whether the relationship between the temperature and the pressure can be used as a basis for judging whether the combination of refrigerant gas and oil is used. That is, a combination of refrigerant gas and oil that dissolves 10% of refrigerant gas in oil in a range exceeding the benchmark 値 Go (the upper left range of the line represented by Go), especially due to the low-pressure and low-temperature portion of the evaporator of the air-conditioning system, etc. The pressure and temperature are in the lower right range of the line indicated by Go, so it means that only less than 10% of the refrigerant gas is dissolved in the oil, the viscosity of the oil becomes high and the oil is not easy to return to the gas compressor. Conversely, in the range below the benchmark 値 Go (the lower right range of the line represented by Go), a combination of refrigerant gas and oil in which 10% of the refrigerant gas is dissolved in the oil, refrigerant gas is also present in low-pressure and low-temperature parts such as evaporators. 1 0 If more than% is dissolved in the oil, it means that the refrigerant gas is easily dissolved and the oil is easy to return to the gas compressor. There are various combinations as a combination of oil and refrigerant gas, but the paper size shown in Figure 7 is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) -15- 486547 Employees ’Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs printed 5 A7 B7__ 5. Benchmark 値 G of the description of the invention (13). The following easy-to-dissolve combinations are as shown in the figure: (1) PAG (Polyolefin Glycol) 1 oil and R2 2 refrigerant of PAG oil, (2) PAG2 oil and R407C refrigerant of PAG oil, (3 ) Diethyl ether oil 1 and R407C refrigerant of acetamidine oil, (4) Carbonate 1 oil and R407C refrigerant of carbonate oil, (5) Carbonate 2 oil of carbonate oil and R410a refrigerant, (6) Ester-based oil Ester 1 oil and R407C, (7) Ester oil 2 and R41〇a refrigerant, (8)? 0 oil? 80 02 oil and ruler 1343, (9)? 80 series of oil? 803 oil and 1134 refrigerant, (10) PAG4 PAG oil and R134a refrigerant. As can be seen from Fig. 7, among the combinations of these oils and refrigerants, especially the combination of (1) and (8) is most easily dissolved. It is not shown in FIG. 7. As a combination of an oil and a refrigerant gas that do not easily dissolve more than the standard 値 g 〇, there are a paraffin-based oil and R 2 2 refrigerant, a naphthenic-based oil and R 1 3 4 a refrigerant, and an alkyl group. Benzene oil and R407C refrigerant. In the above-mentioned embodiment, the description has been given of a multi-compressor having two compressor bodies. However, the present invention is also applicable to a multi-compressor having two or more compressor bodies. (Effects of the Invention) In the gas compressor of the present invention, as described above, the space volume of the discharge chamber can be enlarged to a large required amount to reduce the oil circulation rate of the air-conditioning system and ensure a sufficient oil amount in the gas compressor. Volume person. In this way, since the paper size of the high-pressure refrigerant gas containing the unseparated oil component (unseparated oil content) of the oil separator is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) -------- ----- T ------- Order --------- Line (Please read the notes on the back before filling this page) -16-Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 486547 A7 • _B7 ___ V. Description of the invention (14) The stay time of the discharge chamber becomes longer. Therefore, increase the ratio of the unseparated oil content to the oil storage part at the bottom of the discharge chamber by its own weight. The unseparated oil content is on the condenser side of the air conditioning system The amount of inflow is greatly reduced, and the oil that is not directly related to the original cooling will not be circulated in the air conditioning system, which can improve the cooling efficiency. In addition, even if the refrigerant gas and the oil are a combination that is easy to dissolve and not easy to separate, the oil circulation rate in the air conditioning system can be reduced, and the oil can be stored sufficiently in the gas compressor. The effect of poor lubrication of the gas compressor. (Brief description of the drawings) Fig. 1 is a longitudinal sectional view showing an embodiment (single compressor) of a gas compressor of the present invention. Fig. 2 is a view of arrow A in Fig. 1. Fig. 3 is a partial cutaway view of another embodiment (multi-compressor) of the gas compressor of the present invention as viewed from a plane. Fig. 4 is a sectional view taken along the line AA in Fig. 3; Fig. 5 is an explanatory diagram showing the relationship between the ratio of the discharge chamber space to the suction gas exhaust volume per rotation of the compressor and the OCR in the case of the single compressor shown in Fig. 1; Fig. 6 is an explanatory diagram showing the relationship between the ratio of the discharge chamber space to the suction gas discharge volume per rotation of the compressor and 0 C R when there are many compressors shown in Fig. 3; Figure 7 is an explanatory diagram showing the relationship between the temperature and the pressure caused by the different combination of refrigerant gas and oil when 10% of the refrigerant gas is dissolved in the oil. The paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) -------------------- Order --------- line (Please read the precautions on the back before filling this page) -17 -486547 A7 B7_ 5. Description of the Invention (15) 〇 Figure 8 is a sectional view of a conventional gas compressor. Fig. 9 is an explanatory diagram showing an air conditioning system. (Description of symbols) 1: case, 2: front, 3: housing, 3 a: carcass, 4: compressor body, 4 a: rotor shaft, 4 b: rotor, 4 c: front block, 4d: cylinder , 4e: rear block, 5: oil separator, 6: suction chamber, 6a: suction 'port, 7: discharge chamber, 7a: discharge port, 7b: oil storage unit, 8: air conditioning system, 9: condensation Heater, 10: expansion valve, 1 1: evaporator, 700: shared discharge chamber. -------------------- Order --------- Line (Please read the notes on the back before filling this page) Employees of the Intellectual Property Bureau of the Ministry of Economic Affairs The paper size printed by the consumer cooperative is applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm) -18 ·