低频变力矩技术在变频变容多联机中的应用

Application of low-frequency variable torque technology to variable frequency and volume multi-connected air-conditioning(heat pump)unit

通过分析压缩机大小容积气缸低频负载力矩畸变原理,建立以变频变容多联机为组成单元的自适应负载力矩学习数学模型,采用学习链PD调节力矩幅值相位的前馈设计方法,实现变频变容多联机在各工况条件下大小容积气缸切换后低频段出现机组管路振动的抑制作用.采用该技术后,实际测试机组振动幅值最大为262μm,满足QJ/GD43.00.031《多联式空调(热泵)机组》要求,解决了变频变容多联机低频段管路振动应力应变问题,保证其可靠运行.

Through analyzing the distortion principle of low-frequency load torque of large and small volume cylinders of compressor,a mathematical model of self-adaptive load torque learning is established,which is composed of variable frequency and volume multi-connected air-conditioning( heat pump) unit. The feedforward design method of learning chain PD regulating torque amplitude and phase is used to restrain the pipeline vibration in the low-frequency section after the large and small volume cylinders switching of the variable frequency and volume multi-connected air-conditioning( heat pump) unit under various working conditions. After using this technology,the maximum vibration amplitude of the actual test unit is 262 μm,which satisfies the requirements of QJ/GD 43.00.031 Multi-connected air-conditioning( heat pump) unit. The problem of pipeline vibration stress and strain in the low-frequency section of variable frequency and volume multi-connected airconditioning( heat pump) unit is solved,so as to ensure its reliable operation.