第三章的压缩机振动响应分析主要是运用 ANSYS 有限元方法分析 了 THU33WC6-U 型双转子压缩机正常运行时 由于压缩力矩的波动所引 起的压缩机壳体振动响应 进一步从理论上证实了双转子压缩机在振动 性能上的优异性
I
上海交通大学硕士学位论文
在此基础上着重介绍了该产品在实际研发过程中在噪音问题上所遇 到和解决的三个问题
The first of all, the noise source of the rotary home air-condition compressor are investigated, and specially focused on the aerodynamic noise in the compressor and the vibration response of the structure.
学位论文作者签名
日期
年月日
上海交通大学 学位论文版权使用授权书
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fr
固有频率 Hz
f
激励频率 Hz
ωr 固有圆频率 rad/s ω 激励圆频率 rad/s
n
压缩机转速 r/min
经过多次的设计改进和提高 作者主持开发的 THU33WC6-U 压缩机 的性能日益完善 目前已经投入大批量生产 在多个空调厂家替代了进 口产品 2003 年度预计产值高达 3 亿多人民币 在国内同类产品中市场 份额占有率遥遥领先 关键词 空调压缩机 双转子 噪音 振动 储液器 排气 倒谱解耦
II
ANALYSIS AND CONTROL OF NOISE RADIATED FROM
In order to earn bigger share of market, the Shanghai Hitachi Electrical Appliances Co., Ltd. was going to develop the 3HP compressor. As the leader of this new project, I successfully developed the new product with all team efforts. This paper mainly analyzes and solves the noise problem of THU33WC6-U, a typical 3HP twin-rotary compressor.
Three problems encountered and solved during the research and development of the product are introduced in the rest of the thesis. The abnormal noise is investigated in Chapter 4, and the peak noise was found at frequency of 3150Hz. The problem are solved by improving the design at the surge hole near the discharge port.
The mechanism of compressor noise are introduces in Chapter 2, such as the gas path inside the air-condition compressor, the mechanism of suction/discharge noise generation, the computing method of the gas column module and the methods of gas noise reduction. The structure of air-condition compressor, transmission path of vibration, cause of surface noise radiation and computing methods of the case vibration model are also discussed.
第四章为排气口噪音异常问题的分析和解决 开发过程中 发现压 缩机噪声频谱在 3150Hz 左右有较高尖峰 经调查后找出了最初的设计在 排气口的消声孔设计中存在的缺陷 最后修改了设计并试验验证成功
第五章的压缩机储液器 啸叫声 一章阐述的是在产品开发初期 压缩机试制品的噪声测试中经常发现有刺耳的 啸叫声 发出 分析判 断为储液器内部发出 经过详细调查和流体计算 判明是由于双吸气管 互相干扰所致 改变吸气管口的设计形状后 该问题得以顺利解决
AIR CONDITIONAL COMPRESSORS
ABSTRACT
The problems of aerodynamic noise of air condition are studied theoretically, which are mainly due to the suction noise and discharge noise. Some practical problems of noise control are solved successfully.
第六章主要介绍了电机转子窜动音的解决过程 THU33WC6-U 压缩 机在开发成功后投入了批量生产 然而在某空调器厂的使用中却发生了 奇怪的 蛤蟆音 运用倒谱解耦技术 成功了解除了压缩机转速频率的 调制后 找到了发出 蛤蟆音 的壳体噪声源 进一步研究发现 正是 由于该空调厂的非正常工况下电机转子的窜动导致了 蛤蟆音 的发生 经过适当的设计改进和用户说明后 该问题已得到较为圆满的解决
By changing the shape of the suction pipes, the problems that the compressor screamed from inside accumulator are solved Chapter 5, which turns out to be caused by the interaction between two suction pipes. The up-down noise of rotor is analyzed in Chapter 6. After THU33WC6-U compressors were put into mass production, “frog-noise” was found at some air conditioner manufactory. By using the quefrency technology, the compressor’s rotation frequency
The performance of THU33WC6-U is improved dramatically after several design enhancements. It has been put into mass production and has replaced import products in some air conditioner factories. This product advances in counterpart market and is estimated to produce up to 300 million Yuan in 2003.
Key words: air conditional compressor, twin-rotary, noise, vibration, accumulator, discharge, quefrency
上海交通大学硕士学位论热 等熵 指数
p
声压／压力
密度
m/s rad/m pa kg/m3
m
简谐阶次
i
谐波次数
Ra 声阻
Using the ANSYS, Chapter 3 analyzes the compressor’s shell vibrational responses of compressor shell are simulated with finite element method, which are excited by the fluctuation of the compression torque when THU33WC6-U works properly. Further, the advantage of twin-rotary compressor in vibration control is analyzed by numeric simulation.
作者攻读工程硕士期间 正值上海日立电器有限公司为进一步开拓市 场, 需要开发大功率 3HP 双转子压缩机来挤占竞争对手的市场份额 作 者作为该新产品项目的负责人 与小组成员们历时 2 年多成功地研制开 发 了 这 一 产 品 本 文 主 要 针 对 3HP 双 转 子 压 缩 机 的 代 表 机 种 THU33WC6-U 压缩机噪音问题的分析和解决进行了论述
modulation was dissolved and the source of the frog-noise are understood. Further research found out that it’s the vibration of the rotor under abnormal working circumstance that caused the frog-noise. It is solved by appropriate design improvement and user instructions.