200302318 A7 B7 五、發明説明（1) 發明之詳細說明 發明所屬技術領域 (請先閲讀背面之注意事項再填寫本頁) 本發明是有關用於冷凍循環系統，以自然冷媒的異丁 烷（R600a)作爲壓縮對象流體的往復式密閉型電動壓縮機 先行技術 例如冷藏庫等大多使用往復式密閉型電動壓縮機作爲 構成冷凍循環系統的壓縮機。於此種壓縮機中’聯結一體 設於主軸的曲柄銷與收容於缸筒內的活塞的手段之一進一 步具有球關節機構部。 此球關節機構部將連桿之一端部聯結於轉動自如地嵌 入主軸的曲柄銷的大徑部，連桿之另一端則伸入活塞內部 。於連桿之另一端部一體設置球體，其爲設於上述活塞的 球軸承滑動自如地環抱支持。 經濟部智慧財產局員工消費合作社印製 旋轉驅動上述主軸，隨著曲柄銷的偏心旋轉運動作動 的連桿以球關節機構部爲支點進行搖動運動。因此’活塞 於汽缸內進行往復運動，反覆進行冷媒氣體的吸入、壓縮 及吐出。 發明欲解決之問題 例如冷藏庫用冷凍循環系統所用冷媒一般使用HFC (氣 氟化碳）冷媒的R134a (1，1，1，2-四氟乙烷）。藉由使 用此R 1 34a，消除過去所用冷媒R 1 2 (二氯二氟甲烷）的缺點 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -5 - 200302318 A 7 B7 五、發明説明（2 ) 即臭氧層破壞的憂慮，在地球環保方面極有效。 (請先閲讀背面之注意事項再填寫本頁) 且，就冷媒而言，除了對其要求臭氧層破壞係數低以 外，還要求地球暖化係數低。R1 34a的臭氧層破壞係數雖然 爲零，不過，卻存在有某一程度的暖化係數。因此，只要 所有冷凍循環機器使用R1 34a，於最近將來即有對地球暖化 產生影響之虞。 另一方面，就臭氧層破壞係數低且地球暖化係數低的 自然冷媒而言，已知有異丁烷 （R600a)。藉由使用此種 冷媒，幾乎可同時達到臭氧層破壞及地球暖化的防止， 極爲理想。 不過，目前正處於適應R1 34a的冷凍循環構成部件的 開發途中，適應異丁烷（R600a)冷媒的構成部件大都百 廢待舉。因此，本發明人等把注意力放在目前使用冷媒變 更所造成影響最顯著的壓縮機。 本發明是有鑑於上述情事而提出的技術，其目的在於 提供可適用於使用不僅在臭氧層破壞防止方面有效，且對 地球暖化的影響少的冷媒：異丁烷 （R600a)的冷媒循環系 統，謀求可靠性提高的往復式密閉型電動壓縮機。 經濟部智慧財產局員工消費合作社印製 用以解決問題之手段 爲了實現上述目的，本發明係一種往復式密閉型電動 壓縮機，其爲自與主軸成一體的曲柄銷伸延連桿，經由 球關節機構部聯結此連桿與收容於缸筒內的活塞的往復 式密閉型電動壓縮機，球關節機構部由一體設於連桿端 -6 - 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） 200302318 A7 B7 五、發明説明（3) (請先閲讀背面之注意事項再填寫本頁) 部的球體以及設於活塞並滑動自如地環抱支持球體的球 軸承構成，其壓縮對象流體爲冷媒：異丁烷 （R600a)， 並且將關節機構部的平均速度V與壓縮行程時作用於球關 節機構部的負載F的關係設定爲v X F<200 N · m/s。 進一步將構成球關節機構部的球體的直徑d設定在 14.5mm (毫米）以下。 進一步將隨著曲柄銷偏心旋轉運動而進行的連桿搖動 運動中的連桿搖動角度設定在54 °以下。 進一步將主軸的旋轉數設定在105rps以下。 進一步對球軸承施以氮化處理及磷酸錳處理二者或其 中任一種處理。 進一步採用含0.5至2.0%鉻 （Cr)的高碳鉻鋼材作爲球 體的材料。 進一步於球體與球軸承之間夾設由PTFE，PFA等熱可塑 性樹脂材料構成的緩衝環。 藉由採用解決以上問題的手段’構成最適於冷媒：異 丁烷（R600a)壓縮用的壓縮機，謀求可靠性的提高。 經濟部智慧財產局員工消費合作社印製 發明之實施形態 以下根據圖面說明本發明的實施形態。 第1圖顯示縱剖構成例如冷藏庫的冷凍循環系統的往復 式密閉型電動壓縮機的正視圖 就冷藏庫的冷凍循環系統而言，除了上述壓縮機之外 ，還具備冷凝器、膨脹裝置以及蒸發器，這些構成部件經 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 200302318 A7 B7 五、發明説明（4) 由冷媒管連通，構成冷凍循環迴路。 (請先閱讀背面之注意事項再填寫本頁) 其特徵在於：採用自然冷媒的異丁烷（R600a)作爲此 種冷凍循環系統所用的冷媒，具備後述往復式密閉型電動 壓縮機，並以其作爲最適於此冷媒的壓縮機。 於此往復式密閉型電動壓縮機中，圖面中的1是縱型密 閉殼體，機架2經由彈簧2a彈性支持於此密閉殼體1內的上 下方面的大致中間部。於上述機架2的上部側載設壓縮機構 部3，於下部側設置電動機部4。 上述壓縮機構部3採用所謂的往復式壓縮機構。且，對 此加以說明，沿上述機架2的中心部設置樞支用孔2b，主軸 的旋轉軸5旋轉自如地嵌入其中。 滑動自如載置於機架2上面的軸環部5a—體設在此旋轉 軸5的上端部，見有預定量偏心的中心軸的曲柄銷5b進一步 與旋轉軸5的中心軸連接，設在軸環部5a的上部。 因此，旋轉軸5 —旋轉驅動，軸環部5 a成滑動接觸狀態 於機架2上面旋轉，並且，上述曲柄銷5b沿旋轉軸5中心的 周圍旋轉。 經濟部智慧財產局員工消費合作社印製 上述壓縮機構部3進一步具備載設於機構2上面，軸向 呈水平的汽缸6。此汽缸6的內部構成往復自如地收容活塞7 的缸室8。 連桿9的一端經由球關節機構部1〇聯結於上述活塞7。 旋轉自如地嵌合於上述曲柄銷5b的大端部11設在上述連桿9 的另一端。 就上述球關節機構部10加以說明，球體12—體設在上 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） _ 8 - 200302318 A7 _________B7 五、發明説明（5 ) 述連桿9的一端。另一方面，於活塞7內部設置球軸承1 3。 此球軸承1 3轉動自如地環抱支持上述球體1 2。 (請先閱讀背面之注意事項再填寫本頁) 藉此，隨著曲柄銷5b的偏心旋轉作動的連桿9可以球關 節機構部1 〇作爲支點，進行搖動運動，活塞7於汽缸6內往 復運動。 另一方面，汽缸6的開口端以閥機構1 5閉塞，並且藉缸 頭蓋1 6覆蓋。雖未詳細圖示，於上述缸頭蓋1 6設置將內部 分成二部的間隔部，以其一空間作爲吸入室，並以另一空 間作爲吐出室。 上述閥機構1 5設置具備吸入口、吐出口的閥板、吸入 口及吐出口分別藉吸入閥及吐出閥啓閉。並且，上述吸入 口對向吸入室，吐出口對向吐出室。 相對於如此構成的壓縮機構部3，上述電動機部4由嵌 裝於上述旋轉軸5自機架2向下突出的部位的轉子17以及具 備與此轉子17的周面之間有狹小間隙的內周面，藉適當手 段自上述機架2垂設固定的定子18構成。 接著，就上述往復式密閉型電動壓縮機的壓縮運轉以 及其伴生的冷凍循環作用加以說明。 經濟部智慧財產局員工消費合作社印製 電動機部4一通電而旋轉驅動旋轉軸5，曲柄銷5b即一 體偏心旋轉.。響應此偏心旋轉，經由連桿9及球關節機構部 10，活塞7於缸塞8內往復運動。 將藉蒸發器蒸發而低壓化的冷媒氣體即異丁烷 (R600a)氣體導入並充滿於密閉殼體1內。此氣導入缸頭蓋16 內的吸入室，進一步隨著活塞7的移動（往運動），吸入缸 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 200302318 A7 B7 五、發明説明（6 ) 筒6的紅室8。 (請先閱讀背面之注意事項再填寫本頁) 藉由活塞7反方向移動（返運動），壓縮異丁烷氣體 (R600a)。活塞7—移動至所謂的上死點位置，吐出閥即開啓 ，將在缸室8內壓縮而高壓化的異丁烷氣體吐出至缸頭蓋16 的吐出室。 此高壓氣體進一步經由殼體內吐出管，自密閉殼體， 導出至外部冷媒管，從而導入上述冷凍循環系統。在旋轉 軸與繼續旋轉之後，活塞7進行返運動，反覆上述冷凍循環 〇 第2圖是橫剖壓縮機構部3的一部份的槪略平面圖。 特別就上述曲柄銷5b的偏心旋轉運動，其伴生的上述 連桿9的搖動運動以及上述球關節機構部10與上述活塞7的 關係加以說明。 隨著上述旋轉軸5的旋轉，曲柄銷5b偏心旋轉，曲柄銷 中心Oa描繪出以偏心量作爲旋轉半徑的圓形的旋轉軌跡A 1 。連桿9進行成預定搖動角度α的搖動運動，於球關節機構 部10中，球體12與球軸承13相對滑動。 經濟部智慧財產局員工消費合作社印製 在導入缸室8的冷媒氣體即異丁烷（R600a)氣體壓縮之 際，施加於活塞7的頂面的負載（F)，此力經由活塞7作用 於球關節機構部10。 雖然一般以施加於球關節機構部10的面壓（P)與球關 節機構部10的滑動速度（V)的積作爲對球關節機構部10的 評估，不過，於此以上述最大負載（F)與球體12滑動時的 平均速度（V)的積作爲指標。 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） _ η η _ 200302318 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明説明（7) 求算最大負載F與平均速度V的積的式子如次。 F二（7Γ /4) X (D2) X (Pd- Ps) V= {π χ d χ {a /3 60) x f 不過，D :活塞7的直徑；P d :吐出壓力；p s:吸入壓力； d :球體1 2的直徑；α :連桿9的搖動角度； f:旋轉軸5的旋轉數。 第3圖是顯示F χ V値與球關節機構部1〇中球軸承13 的摩損量的關係的特性圖。 F XV値在200N xm/s以下係摩損量少的良好狀態。 不過，200N · m/s以上則有摩損量增大的傾向。 又，考慮異丁烷 （R600a)的使用壓力，假定吐出壓力 爲最大的1 (MPa)，吸入壓力爲最低〇.〇5MPa程度。 於此情形下，爲了滿足F X V<200N χ m/s，良好的 是球體12直徑在14.5 mm以下，搖動角度在54°以下，旋 轉軸5的旋轉數在l〇5rps以下。 進一步，爲了提高球關節機構部1 〇的耐磨損性，對構 成球關節機構部1 〇的支承側的球軸承1 3施以氮化處理及磷 酸錳二者或其中之一處理是有效的手段。 又，使用含〇 . 2至2.0%鉻的高碳鉻鋼材作爲一體設於 連桿9-端的球體12的材料亦有效。 如此，就球關節機構部1 〇的特徵而言，球軸承1 3藉由 歛縫（塑性變形）加工支承球體12。因此，於歛縫部份 (請先閲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（210X297公釐） _ ” _ 200302318 A7 _______B7 五、發明説明（8 ) 夾設由PTEF · PF A等熱可塑性樹脂材料構成的環狀緩衝 環2〇作爲緩.衝材，使球關節機構部1 〇的滑動動作極平穩 〇 (請先閲讀背面之注意事項再填寫本頁) 且由於冷媒：異丁烷（R600a)係烴系，故亦爲可燃性 冷媒。若冷凍循環系統的低壓側的壓力小於大氣壓力， 不論何種原因，只要達到氣體自冷凍循環系統漏出的條 件，即會將空氣吸入冷凍循環系統內。 另一方面，在構成電動機部4的定子1 8的線圈部出現 微細瑕疵情形下，會自瑕疵放電而發生電弧。結果，有 可燃性冷媒的異丁烷 （R600 a)於冷凍循環系統內燃燒或 爆炸之虞。 且，對定子1 8鐵心繞線的手段有分布捲繞及集中捲繞 。上述分布捲繞容易在繞線之際發生線圈受到應力作用 而出現瑕疵，上述集中捲繞有線圈不會受到應力作用， 不會發生瑕疵的特徵。 經濟部智慧財產局員工消費合作社印製 因此，在分布捲繞情形下，於繞線結束後，固設電絕 緣物於線圈以修補受到應力作用而發生的瑕疵。具體而 言，在線圈繞線後，塗覆淸漆於線圈部份以作爲電絕緣 物，此後，加熱固化，或者亦可常溫固化。 因此，即使是分布捲繞，亦消除於使用可燃性冷媒： 異丁烷 （R600a)的冷凍循環系統中發生燃燒或爆炸的危 險。於集中捲繞情形下，由於線圈不會受到應力作用， 不會發生瑕疵，故保持原狀使用。 更且，第1圖所示往復式密閉型電動壓縮機中的壓縮 -12- 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 200302318 A7 B7 五、發明説明（9) 機構部3固然舉汽缸6單獨（_缸）者加以說明，不過， 不限於此，亦可爲於旋轉軸5的左右兩側對稱地具備一對 (雙缸）汽缸的壓縮機構部，上述限定條件仍然全部適用 (請先閱讀背面之注意事項再填寫本頁) 發明效果 如以上說明，根據本發朋，得可適用於使用不僅在 臭層破壞防止方面有效，且對地球暖化影響少的冷媒： 異丁院（R 6 0 0 a)的冷凍循環系統，謀求可靠性提高的效 果。 圖面之簡單說明 第1圖是顯示本發明一實施形態的往復式密閉型電動 壓縮機的縱剖正視圖。 第2圖是顯示相同實施形態，用來說明壓縮機構部的一 部份的動作的圖面。 第3圖是顯示相同實施形態的球關節機構部的FXV値與 球軸承摩損率的特性圖。 經濟部智慧財產局員工消費合作社印製 主要元件對照表 5 旋轉軸（主軸） 5b 曲柄銷 6 汽缸 7 活塞 本紙張尺度適用中國國家標準（CNS ) A4規格（210 X 297公釐） -13 - 200302318 A7 B7 五、發明説明（1〇) 9 連桿 12 球體 13 球軸承 10 球關節機構部 20 緩衝環 (請先閲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（210X297公釐） -14-200302318 A7 B7 V. Description of the invention (1) Detailed description of the invention The technical field to which the invention belongs (please read the notes on the back before filling out this page) The invention relates to isobutane (R600a) used in refrigeration cycle systems with natural refrigerants ) Reciprocating hermetically sealed electric compressors that are fluids to be compressed are used in the prior art. For example, reciprocating hermetically sealed electric compressors are often used as compressors constituting refrigeration cycle systems in refrigerators and the like. In such a compressor, one of the means for coupling the crank pin provided on the main shaft and the piston accommodated in the cylinder further has a ball joint mechanism portion. This ball joint mechanism unit connects one end of the connecting rod to the large-diameter portion of the crank pin that is rotatably fitted into the main shaft, and the other end of the connecting rod extends into the piston. A ball is integrally provided at the other end of the connecting rod, and it is a ball bearing provided on the piston to hug and support freely. Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs The above-mentioned main shaft is driven to rotate, and the connecting rod which is actuated in accordance with the eccentric rotation of the crank pin performs a rocking motion with the ball joint mechanism as a fulcrum. Therefore, the 'piston' reciprocates in the cylinder, repeatedly sucking, compressing, and discharging refrigerant gas. Problems to be Solved by the Invention For example, a refrigerant used in a refrigerating cycle system for a refrigerator is generally R134a (1,1,1,2-tetrafluoroethane) which is an HFC (gas fluorinated carbon) refrigerant. By using this R 1 34a, the shortcomings of the refrigerant R 1 2 (dichlorodifluoromethane) used in the past can be eliminated. This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -5-200302318 A 7 B7 V. Description of the Invention (2) The worry of destruction of the ozone layer is extremely effective in terms of global environmental protection. (Please read the precautions on the back before filling out this page.) In addition to refrigerants, in addition to requiring a low ozone layer destruction factor, it also requires a low global warming factor. Although the ozone depletion coefficient of R1 34a is zero, there is a certain degree of warming coefficient. Therefore, as long as all refrigeration cycle machines use R1 34a, there is a risk that it will affect global warming in the near future. On the other hand, isobutane (R600a) is known as a natural refrigerant having a low ozone depletion coefficient and a low global warming coefficient. By using such a refrigerant, the destruction of the ozone layer and the prevention of global warming can be achieved almost simultaneously, which is extremely desirable. However, it is currently in the process of developing components suitable for the refrigeration cycle of R1 34a, and most of the components suitable for isobutane (R600a) refrigerants are to be abandoned. Therefore, the present inventors have paid attention to the compressor which has the most significant influence on the use of refrigerant changes. The present invention is a technology proposed in view of the foregoing circumstances, and an object thereof is to provide a refrigerant circulation system that is applicable to the use of a refrigerant: isobutane (R600a), which is not only effective in preventing the destruction of the ozone layer, but also has little impact on global warming. A reciprocating hermetic electric compressor that seeks to improve reliability. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs to solve the problem. In order to achieve the above-mentioned object, the present invention is a reciprocating hermetic electric compressor. The mechanism unit connects this connecting rod with the reciprocating closed electric compressor of the piston housed in the cylinder. The ball joint mechanism unit is integrated at the end of the connecting rod-6-This paper size applies to Chinese National Standard (CNS) A4 specifications ( 210X 297 mm) 200302318 A7 B7 V. Description of the invention (3) (Please read the precautions on the back before filling out this page) The spheres and ball bearings provided on the piston and sliding around the support sphere are composed of compression objects The fluid was a refrigerant: isobutane (R600a), and the relationship between the average speed V of the joint mechanism portion and the load F acting on the ball joint mechanism portion during the compression stroke was set to v X F < 200 N · m / s. The diameter d of the spheres constituting the ball joint mechanism is further set to 14.5 mm (mm) or less. Further, the swing angle of the link during the eccentric rotation of the crank pin is set to 54 ° or less. Further, the number of rotations of the main shaft is set to 105 rps or less. The ball bearing is further subjected to either or both of a nitriding treatment and a manganese phosphate treatment. Further, high-carbon chromium steel containing 0.5 to 2.0% chromium (Cr) is used as the material of the spheres. Further, a buffer ring made of a thermoplastic resin material such as PTFE or PFA is interposed between the ball and the ball bearing. By adopting the means to solve the above problems, a compressor most suitable for the compression of isobutane (R600a) is constructed to improve reliability. Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs Embodiments of the Invention Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a front view of a reciprocating hermetically-sealed electric compressor constituting, for example, a refrigerating cycle system of a refrigerator. The refrigerating cycle system of the refrigerator includes a condenser, an expansion device, and Evaporator, these constituent parts apply the Chinese National Standard (CNS) A4 specification (210X297 mm) 200302318 A7 B7 according to this paper size V. Description of the invention (4) Connected by refrigerant tubes to form a refrigeration cycle. (Please read the precautions on the back before filling this page) It is characterized by using isobutane (R600a) as the refrigerant used in this refrigeration cycle system, equipped with a reciprocating hermetic electric compressor described below, and As the most suitable compressor for this refrigerant. In this reciprocating hermetic type electric compressor, 1 in the drawing is a vertical hermetic case, and the frame 2 is elastically supported by the middle of the upper and lower sides of the hermetic case 1 via a spring 2a. A compression mechanism section 3 is mounted on the upper side of the frame 2 and a motor section 4 is mounted on the lower side. The compression mechanism unit 3 employs a so-called reciprocating compression mechanism. Furthermore, to explain this, a pivot support hole 2b is provided along the center portion of the frame 2, and the rotation shaft 5 of the main shaft is rotatably fitted therein. The collar portion 5a mounted on the upper surface of the frame 2 can be slid freely. The collar portion 5a is mounted on the upper end of the rotary shaft 5. A crank pin 5b with a predetermined amount of eccentric central shaft is further connected to the central shaft of the rotary shaft 5. The upper part of the collar part 5a. Therefore, the rotation shaft 5 is rotationally driven, and the collar portion 5a rotates on the frame 2 in a sliding contact state, and the crank pin 5b rotates around the center of the rotation shaft 5. Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs The compression mechanism section 3 further includes a cylinder 6 mounted on the mechanism 2 and having a horizontal axis. The inside of this cylinder 6 constitutes a cylinder chamber 8 which reciprocally accommodates the piston 7. One end of the connecting rod 9 is connected to the piston 7 via a ball joint mechanism portion 10. A large end portion 11 which is rotatably fitted to the crank pin 5 b is provided at the other end of the link 9. The above-mentioned ball joint mechanism part 10 will be described. The sphere 12 is provided on the upper paper. The Chinese national standard (CNS) A4 specification (210X297 mm) is applicable. _ 8-200302318 A7 _________ B7 V. Description of the invention (5) The connecting rod 9 of one end. On the other hand, a ball bearing 13 is provided inside the piston 7. This ball bearing 13 is rotatably embracing and supporting the above-mentioned ball 12. (Please read the precautions on the back before filling in this page.) With this, the connecting rod 9 that is actuated with the eccentric rotation of the crank pin 5b can perform the rocking motion of the ball joint mechanism portion 10 as a fulcrum, and the piston 7 reciprocates within the cylinder 6. motion. On the other hand, the open end of the cylinder 6 is closed with a valve mechanism 15 and is covered by a cylinder head cover 16. Although not shown in detail, the cylinder head 16 is provided with a partition that divides the inside into two, with one space as a suction chamber and the other space as a discharge chamber. The valve mechanism 15 is provided with a valve plate having a suction port and a discharge port, and the suction port and the discharge port are opened and closed by a suction valve and a discharge valve, respectively. The suction port faces the suction chamber, and the discharge port faces the discharge chamber. With respect to the compression mechanism unit 3 configured as described above, the motor unit 4 includes a rotor 17 fitted in a portion of the rotation shaft 5 protruding downward from the frame 2 and an inner portion provided with a narrow gap between a peripheral surface of the rotor 17 and the rotor 17. The peripheral surface is constituted by a stator 18 which is fixed from the frame 2 by appropriate means. Next, the compression operation of the above-mentioned reciprocating hermetic electric compressor and the accompanying refrigeration cycle function will be described. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. When the motor section 4 is energized to rotate and drive the rotating shaft 5, the crank pin 5b rotates eccentrically. In response to this eccentric rotation, the piston 7 reciprocates in the cylinder plug 8 via the connecting rod 9 and the ball joint mechanism portion 10. Isobutane (R600a) gas, which is a refrigerant gas that has been reduced in pressure by the evaporator, is introduced and filled in the closed case 1. This gas is introduced into the suction chamber in the cylinder head cover 16 and further moves with the piston 7 (moving forward). The paper size of the suction cylinder applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 200302318 A7 B7 V. Description of the invention ( 6) The red chamber 8 of the cylinder 6. (Please read the precautions on the back before filling this page.) Compress the isobutane gas (R600a) by moving the piston 7 in the reverse direction (back motion). Piston 7—moves to the so-called top dead center position, the discharge valve is opened, and the isobutane gas compressed and high-pressured in the cylinder chamber 8 is discharged to the discharge chamber of the cylinder head cover 16. This high-pressure gas is further discharged from the casing through a tube, is sealed from the casing, and is discharged to an external refrigerant tube to be introduced into the above-mentioned refrigeration cycle system. After the rotation axis and the continuous rotation, the piston 7 performs a back movement and repeats the above-mentioned refrigeration cycle. FIG. 2 is a schematic plan view of a part of the compression mechanism section 3 in cross section. In particular, the eccentric rotation of the crank pin 5b, the rocking motion of the connecting rod 9 and the relationship between the ball joint mechanism 10 and the piston 7 will be described. With the rotation of the rotation shaft 5, the crank pin 5b rotates eccentrically, and the center of the crank pin Oa draws a circular rotation locus A 1 with the eccentricity as the rotation radius. The connecting rod 9 performs a rocking motion at a predetermined rocking angle α, and the ball 12 and the ball bearing 13 slide relative to each other in the ball joint mechanism portion 10. The consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs printed a load (F) applied to the top surface of the piston 7 when the isobutane (R600a) gas introduced into the cylinder chamber 8 is compressed, and this force acts on the piston 7球 关节 机构 部 10。 Ball joint mechanism section 10. Although the product of the surface pressure (P) applied to the ball joint mechanism portion 10 and the sliding speed (V) of the ball joint mechanism portion 10 is generally used as the evaluation of the ball joint mechanism portion 10, the maximum load (F The product of) and the average speed (V) when the sphere 12 slides is used as an index. This paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) _ η η _ 200302318 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (7) Calculate the maximum load F and average speed The product of V is as follows. F2 (7Γ / 4) X (D2) X (Pd- Ps) V = {π χ d χ {a / 3 60) xf However, D: diameter of the piston 7; P d: discharge pressure; ps: suction pressure D: the diameter of the sphere 12; α: the swing angle of the connecting rod 9; f: the number of rotations of the rotation axis 5. FIG. 3 is a characteristic diagram showing the relationship between F χ V 値 and the amount of abrasion of the ball bearing 13 in the ball joint mechanism section 10. F XV 値 is less than 200N xm / s, which is a good condition with less abrasion. However, the amount of abrasion tends to increase at 200N · m / s or more. Taking into account the use pressure of isobutane (R600a), it is assumed that the maximum discharge pressure is 1 (MPa) and the minimum suction pressure is about 0.05 MPa. In this case, in order to satisfy F X V <200N χ m / s, it is good that the diameter of the sphere 12 is below 14.5 mm, the swing angle is below 54 °, and the number of rotations of the rotation shaft 5 is below 105 rps. Further, in order to improve the abrasion resistance of the ball joint mechanism portion 10, it is effective to apply both or one of nitriding treatment and manganese phosphate treatment to the ball bearing 13 constituting the supporting side of the ball joint mechanism portion 10. means. It is also effective to use a high-carbon chromium steel material containing 0.2 to 2.0% chromium as the material of the sphere 12 integrally provided on the 9-end of the connecting rod. As described above, the ball joint mechanism 10 is characterized in that the ball bearing 13 supports the ball 12 by caulking (plastic deformation) processing. Therefore, in the caulking section (please read the precautions on the back before filling this page) This paper size applies to the Chinese National Standard (CNS) A4 specification (210X297 mm) _ ”_ 200302318 A7 _______B7 V. Description of the invention (8) An annular buffer ring 20 made of a thermoplastic resin material such as PTEF · PF A is sandwiched as a slow punching material to make the sliding motion of the ball joint mechanism part 10 very smooth. (Please read the precautions on the back before filling in this Page) And because the refrigerant: isobutane (R600a) is a hydrocarbon system, it is also a flammable refrigerant. If the pressure on the low-pressure side of the refrigeration cycle system is less than atmospheric pressure, for whatever reason, as long as the gas leaks from the refrigeration cycle system, The condition is that air is sucked into the refrigeration cycle system. On the other hand, when a minute flaw occurs in the coil portion of the stator 18 of the motor unit 4, an arc is generated from the flaw discharge. As a result, there is a difference in the flammable refrigerant. Butane (R600 a) may burn or explode in the refrigerating cycle system. Furthermore, the means for winding the 18 cores of the stator include distributed winding and concentrated winding. The above-mentioned distributed winding capacity When the coil is wound, the coil will be damaged due to stress. The above-mentioned concentrated coil will not be stressed and will not have defects. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. Next, after the winding is completed, an electrical insulator is fixed to the coil to repair the defects caused by the stress. Specifically, after the coil is wound, a varnish is applied to the coil as an electrical insulator. It can be cured by heating, or it can be cured at room temperature. Therefore, even distributed winding, it eliminates the danger of burning or explosion in the refrigeration cycle system using flammable refrigerant: isobutane (R600a). In the case of concentrated winding Because the coil is not subject to stress and no flaws occur, it is used as it is. Moreover, the compression in the reciprocating hermetic electric compressor shown in Figure 1-12-This paper standard applies to the Chinese National Standard (CNS) A4 specifications (210X297 mm) 200302318 A7 B7 V. Description of the invention (9) Although the mechanism unit 3 takes the cylinder 6 alone (_cylinder) for explanation, but not Here, it is also possible to provide a pair of (double-cylinder) cylinder compression mechanism sections symmetrically on the left and right sides of the rotating shaft 5. The above-mentioned restrictions still apply (please read the precautions on the back before filling this page). As described above, according to the present invention, DEK is suitable for the use of refrigerants that are not only effective in preventing odor layer damage but also have a small impact on global warming: the refrigeration cycle system of Idoin (R 6 0 0 a), which is reliable The effect of improving the performance is simple. The first figure is a vertical sectional front view showing a reciprocating hermetic electric compressor according to an embodiment of the present invention. The second figure is the same embodiment and is used to explain the compression mechanism portion. Part of the motion picture. Fig. 3 is a characteristic diagram showing the FXV 値 of the ball joint mechanism portion and the ball bearing abrasion rate in the same embodiment. Comparison Table of Main Components Printed by Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5 Rotary shaft (spindle) 5b Crank pin 6 Cylinder 7 Piston The paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) -13-200302318 A7 B7 V. Description of the invention (10) 9 Connecting rod 12 Ball body 13 Ball bearing 10 Ball joint mechanism department 20 Cushioning ring (Please read the precautions on the back before filling this page) Printed by the Intellectual Property Bureau Staff Consumer Cooperatives Paper size applies to China National Standard (CNS) A4 (210X297 mm) -14-