冷媒雙螺桿壓縮機之容積調節滑閥負載分析

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姓名

林崇堯(Chong-Yao Lin) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

冷媒雙螺桿壓縮機之容積調節滑閥負載分析
(Load Analysis of Variable-Volume-Ratio Sliding Valve for Refrigerant Twin-Screw Compressors)

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摘要(中)

雙螺桿壓縮機具有高效率與高穩定性等特性，廣泛應用於冷凍系統、大樓空調與食品製造等多種產業，但減少低負載所產生振動與噪音是壓縮機業者重視的課題。本文建立一套數值計算程序，考慮不同轉子齒形及不同工作條件下，可快速計算螺桿轉子與容量調節滑閥所受之氣體力及氣體力矩結果，以評估對機體振噪之影響。程序以螺桿轉子齒形點資料為基礎，計算靜態與動態幾何特性，包括吸、排氣口與滑閥形狀設計，並結合熱力與流體力學計算得到工作腔氣體變動壓力，進而計算轉子及滑閥受到氣體之負載。本文分析兩種不同壓縮機型，除了探討不同負載下，滑閥及轉子受到氣體負載所造成之力及力矩變動差異，更將滑閥受力計算與CFD軟體模擬結果進行比對，證實本研究所建立之數值計算程序具有可靠性外，更可大幅縮短壓縮機設計與分析時程與成本，並有助於改善壓縮機之性能。

摘要(英)

Twin-screw compressors have been widely used in various industrial applications such as refrigeration systems, air conditioners in buildings and food manufacturing due to their high efficiency and stability. However, the vibration and noise generated under low loading operation are still a concern for compressor manufacturers. This study proposes a numerical calculation procedure for quickly calculating the gas-induced forces and torques on the screw rotor pair and the sliding valve for oil-injection twin-screw compressors. In the beginning, the static and dynamic geometry characteristics, including the shapes of suction and discharge ports, and the slider valve, are calculated based on the discrete point data of rotor profile. These geometric data is further used in the thermo-fluid dynamics module to estimate the varying working gas pressure, which is then used in the calculation of gas-induced loads on the rotors and the sliding valve. Two different types of compressors are used in the discussions. The difference of gas-induced forces and torques on the rotors and the sliding valve for different loading conditions are analyzed. In addition, the numerical calculation results of gas-induced loads on the sliding valve are compared with the simulation results from CFD software. As shown in results, the numerical calculation model established in this study has the reliability and practicability to be applied in improvement of compressor performance, and reducing time and cost in the compressor design and analysis process.

關鍵字(中)

★ 雙螺桿壓縮機
★ 容量調節滑閥
★ 數值計算
★ 氣體負載

關鍵字(英)

★ Twin screw compressor
★ sliding valve
★ numerical calculation
★ gas-induced load

論文目次

摘要 I
ABSTRACT II
謝誌 III
目錄 V
圖目錄 VIII
表目錄 XII
符號對照表 XIII
第1章緒論 1
1.1前言 1
1.2 文獻回顧 3
1.3 研究動機與目的 7
1.4 論文架構 8
第2章雙螺桿壓縮機與容量調節滑閥工作原理 11
2.1 雙螺桿壓縮機公、母轉子工作原理 11
2.2 雙螺桿壓縮機與滑閥機構介紹 12
2.2.1 雙螺桿壓縮機與滑閥構造 12
2.2.2 容量調節滑閥工作原理介紹 14
2.3 幾何參數定義與轉子座標系統 16
2.3.1 幾何參數定義 16
2.3.2 公、母轉子座標系統 18
2.4 輸入參數與幾何規格 20
第3章雙螺桿壓縮機幾何特徵計算 22
3.1轉子齒間面積與變化曲線 23
3.1.1 齒間面積 23
3.1.2 面積變化曲線 24
3.2 齒間容積曲線與計算 25
3.2.1 齒間容積變化計算 25
3.2.2 最大齒間容積與吸排氣起始角 26
3.3 壓縮機吸氣孔口設計目標與計算 27
3.3.1 軸向吸氣口 28
3.3.2 徑向吸氣口 29
3.4 壓縮機排氣孔口設計與計算 30
3.4.1 軸向排氣口 30
3.4.2 徑向排氣口 31
3.5 容量調節滑閥幾何設計 33
3.6 吸排氣口與旁通口面積變化計算 35
3.6.1 吸氣口面積變化 36
3.6.2 旁通口形狀與面積變化 39
3.6.3排氣口面積變化 40
第4章轉子與調節滑閥受力與力矩計算 42
4.1 轉子受力與力矩計算 42
4.1.1氣體壓力曲線 42
4.1.2 轉子間接觸力 43
4.1.3 轉子循環氣體壓力負載 45
4.2壓縮機氣體功耗 52
4.3 調節滑閥氣體力與力矩計算 53
4.3.1滑閥氣體軸向力計算 54
4.3.2滑閥氣體徑向力與力矩計算 55
第5章雙螺桿壓縮機轉子與滑閥受力計算案例比較 61
5.1 容量調節滑閥對壓縮機性能之影響 61
5.2 理論數值計算與CFD模擬分析結果比較 64
5.2.1 雙螺桿壓縮機網格與CFD模擬 64
5.2.2 理論與CFD模擬滑閥氣體力之比較 66
5.3 不同負載下數值計算案例比較與討論 75
5.4 滑閥中心位置偏移案例分析 87
第6章結論與未來展望 91
6.1 結論 91
6.2 未來展望 93
參考文獻 94
作者介紹 97

參考文獻

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指導教授

吳育仁(Yu-Ren Wu)

審核日期

2019-7-19

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