Abstract
A pressure pulsation experiment of a dishwasher pump with a passive rotation double-tongue volute was carried out and compared with the pressure pulsation of a single-tongue volute and a static double-tongue volute. The pressure pulsation of the three volute models was compared and analyzed from two aspects of different impeller speeds and different monitoring points. The frequency domain and time–frequency domain of pressure pulsation were obtained by a Fourier transform and short-time Fourier transform, respectively. The results showed that the average pressure of each monitoring point on the rotating double-tongue volute was the smallest and that on the single-tongue volute was the largest. When the impeller rotates at 3000 rpm, there were eight peaks and valleys in the pressure pulsation time domain curve of the single-tongue volute, while the double-tongue volute was twice that of the single-tongue volute. Under different impeller speeds, the changing trends of pressure pulsation time and frequency domain curves of static and rotating double-tongue volutes at monitoring point p1 are basically the same. Therefore, a volute reference scheme with passive rotation speed is proposed in this study, which can effectively improve the flow pattern and reduce pressure inside the dishwasher pump, and also provide a new idea for rotor–rotor interference to guide the innovation of dishwashers.
Highlights
Today, dishwashers are used by more and more families
The pressure pulsation during the operation of the dishwasher pump will cause the vibration of the dishwasher, which will reduce the stability of the system and reduce the service life [3,4,5]
The results showed that the floor-attached vortex can induce a low-frequency pulsation of 2.12 Hz, which let the amplitudes of pressure pulsation be larger than those without the floor-attached vortex
Summary
Dishwashers are used by more and more families. Compared with manual dishwashing, a dishwasher can shorten the cleaning time and save water and labor, making dishwashing simple. An important part of the pump system is the volute structure and parameters (volute tongue angle, cross-section shapes, volute differ shape, etc.) It will affect the pump performance and internal flow [6,7]. Jin et al [8] studied the influence of the gap between the volute tongue and the impeller on the pressure pulsation and the performance of the double suction pump. In order to reveal the new ‘ro tor–rotor ‘ interference mechanism between the high-speed rotation of the3iomf 1p5eller an the low-speed passive rotation of the volute, this paper studies the pressure pulsatio characteristics of the double-tongue volute under passive rotation at different impelle inspteerefedrsentchermouecghhanaisnminbentowveaetnivthee rhoigtaht-isnpgeepdrreostastuioren otfesthtedimevpieclele. Number of blades Z Volute inlet width b3 (mm) Volute base circle diameter D3 (mm) Volute tongue angle θ (o)
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