为了揭示新型开放式水泵旋转双隔舌蜗壳内压力脉动特性和规律，以水槽式洗碗机关键核心部件-开放式水泵为研究对象，基于创新的旋转压力脉动测试技术和设备，首次得到双隔舌蜗壳被动旋转、不同叶轮转速以及不同水位下监测点的脉动时域信号，并进行频域分析。试验结果表明：蜗壳被动旋转过程中消耗能量，导致蜗壳被动旋转时压力脉动平均幅值小于蜗壳静止时的压力脉动平均幅值。由于蜗壳中隔舌的周期设计，在叶轮旋转一周的时间内，压力脉动曲线出现2倍叶片数的波峰和波谷。与蜗壳静止相比，蜗壳被动旋转过程中叶轮与蜗壳的相对速度减小，这使得在叶轮转速为2000rpm、2200rpm、2400rpm以及2600rpm时，蜗壳旋转时的压力脉动主频略小于蜗壳静止时的压力脉动主频。脉动强度与监测点位置相关，位于后泵腔位置监测点压力存在负值，靠近出口位置监测点受到蜗壳喷淋臂上喷嘴射流的影响，脉动曲线变得紊乱，监测点距离复合式叶轮越远，脉动振幅越小。泵在低水位运行时，泵内进入空气，脉动曲线周期性不明显，此时脉动主频为1倍轴频。水位越高，蜗壳被动旋转过程中受到阻力越大，导致脉动主频在水位48mm和66mm时分别为2倍叶频和1倍叶频。本试验采用的旋转测试装置解决了旋转时压力脉动测试问题，为类似问题提供参考。
关键词：开放式水泵；双隔舌蜗壳；压力脉动；轴频；叶频；蜗壳被动旋转
Abstract
In order to reveal the new open water pump rotate inside the double volute tongue insulation pressure pulsation characteristics and features, with water tank type dishwasher key core components in open water pump as the research object, based on the innovation of the rotation pressure pulsation test technology and equipment, for the first time get double volute tongue passive isolation and rotating, different impeller speed under different water level monitoring pulse time domain signal, line frequency domain analysis. The test results showed that the volute consumes energy in the process of passive rotation, which results in that the average amplitude of pressure pulsation when the volute is passive rotation is less than that when the volute is stationary. Due to the periodic design of the tongue in the volute, the peak and trough of the pressure pulsation curve appear twice the number of blades within the time of the impeller's rotation. Compared with the stationary volute, the relative velocity between the impeller and the volute decreases during the passive rotation of the volute, which makes the main frequency of pressure pulsation when the volute rotates slightly smaller than that when the volute is stationary when the impeller speed is 2000rpm, 2200rpm, 2400rpm and 2600rpm. The pulsation intensity is related to the position of the monitoring point. The pressure of the monitoring point at the position of the rear chamber has a negative value, and the monitoring point near the outlet is affected by the jet flow of the nozzle on the volute spray arm, and the pulsation curve becomes chaotic. The farther the monitoring point is from the impeller, the smaller the pulsation amplitude. When the pump runs at low water level, the air enters the pump, and the periodicity of the pulsation curve is not obvious. At this time, the main frequency of the pulsation is 1 times the shaft frequency. The higher the water level is, the more resistance the volute is subjected to during passive rotation, resulting in the main frequency of pulsation being double blade frequency and double blade frequency respectively at the water level of 48mm and 66mm.The rotating test device used in this test solves the pressure pulsation test problem during rotation and provides reference for similar problems.
Key words: open water pump; Double tongue volute; Pressure pulsation; Shaft frequency; blade frequency; Passive rotation of volute
关键词
开放式水泵 /
双隔舌蜗壳 /
压力脉动 /
轴频 /
叶频 /
蜗壳被动旋转
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Key words
open water pump /
Double tongue volute /
Pressure pulsation /
Shaft frequency /
blade frequency /
Passive rotation of volute
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