双螺杆制冷压缩机排气压力脉动特性的实验研究  

Experimental Investigation of the Characteristics of Discharge Pressure Pulsationin a Twin-screw Refrigeration Compressor

作　　者：孙时中 周明龙 陈文卿 王闯 邢子文[2] 苏柏嘉 Sun Shizhong;Zhou Minglong;Chen Wenqing;Wang Chuang;Xing Ziwen;Su Po Chia(China Energy Engineering Group Jiangsu Power Design Institute Co.,Ltd.,Nanjing,211100,China;Scool of Energy and Power Engineering,Xi′an Jiaotong University,Xi′an,710049,China;Suzhou Academy,Xi′an Jiaotong University,Suzhou,215123,China;Hanbell Precise Machinery Co.,Ltd.,Taiwan,32844,China)

机构地区：[1]中国能源建设集团江苏省电力设计有限公司,南京211100 [2]西安交通大学能源与动力工程学院,西安710049 [3]西安交通大学苏州研究院,苏州215123 [4]汉钟精机股份有限公司,中国台湾32844

出　　处：《制冷学报》2024年第1期28-35,共8页Journal of Refrigeration

基　　金：国家自然科学基金(51976148,52206021)资助项目。

摘　　要：为研究一台冷水机组用双螺杆制冷压缩机的压力脉动特性,本文测录了压缩机压缩及排气过程的瞬态压力变化,解析其压力脉动频域特性,研究了运行转速和冷凝温度对压力脉动特性的影响,对比了压缩机采用变频与变滑阀两种容量调节方式在相同制冷量下的压力脉动、噪声和热力性能。研究结果表明:压缩腔压力脉动来源于转子工作容积内压力周期性升高,并受齿间多通道泄漏过程的影响;排气腔压力脉动来源于工作容积与排气腔的周期性连通与脱开,受排气压力及气体质量流量等因素影响。随着转速的升高,排气腔压力脉动从转速为1380 r/min时的58.6 kPa升至4200 r/min时的141.0 kPa。随着冷凝温度的升高,压力脉动幅值从34℃时的132.0 kPa升至57℃时的314.0 kPa。在相同制冷量下与容调滑阀相比,双螺杆制冷压缩机采用变频的容量调节方式在压力脉动、噪声和热力性能方面均具有显著优势,压力脉动降低54.6%以上,噪声值下降2.9 dB(A)以上,COP提升5.5%以上。To explore the characteristics of pressure pulsation in a twin-screw refrigeration compressor,transient pressures during the suction,compression,and discharge phases were measured,and the pressure pulsation characteristics were subsequently analyzed.The study investigated the effects of operating speed and condensing temperature on pressure pulsation and compared pressure pulsation,noise levels,and the coefficient of performance(COP)in twin-screw refrigeration compressors with slide valve control(SVC)and variablespeed control(VSC)at the same volumetric flow rate.The results indicated that pressure pulsation in a twin-screw refrigeration compressor originates from the periodic fluctuation of pressure and mass flow rate.As the rotation speed increased,pressure pulsation gradually increased from 58.6 kPa at 1380 r/min to 141.0 kPa at 4200 r/min.With an increase in condensing temperature from 34℃to 57℃,pressure pulsation also increased from 132.0 kPa to 314.0 kPa.In comparison to SVC,VSC demonstrated significant advantages,featuring more than 54.6%reduction in pressure pulsation,more than 2.9 dB(A)reduction in noise,and more than 5.5%improvement in COP.

关 键 词：双螺杆制冷压缩机 压力脉动 噪声 变频 

分 类 号：TB611[一般工业技术—制冷工程] TB652