• Title/Summary/Keyword: vacuum cleaner

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Effect of Suction Nozzle Modification on the Performance and Aero-acoustic Noise of a Vacuum Cleaner

  • Park, Cheol-Woo;Lee, Sang-Ik;Lee, Sang-Joon
    • Journal of Mechanical Science and Technology
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    • v.18 no.9
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    • pp.1648-1660
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    • 2004
  • The suction nozzle of a vacuum cleaner was modified to enhance the power performance and to reduce the airflow-induced acoustic noise. The suction power efficiencies of the vacuum cleaner were measured for various nozzles; (1) original nozzle, (2) original nozzle with modified trench height, (3) original nozzle with modified connecting chamber, and (4) a combination of (2) and (3). In addition, the suction pressure and sound pressure level around the suction nozzle were measured to validate the reduction of acoustic noise. The power efficiency and mean suction pressure increased when the trench height of the suction nozzle was increased. This was attributed to the suppression of the flow separation in the suction channel. Modification of the connecting chamber in the original nozzle, which had an abrupt contraction from a rectangular chamber into a circular pipe, into a smooth converging contraction substantially improved the suction flow into the connecting pipe. When both modifications were applied simultaneously, the resulting suction nozzle was more effective from the viewpoints of aerodynamic power increase and sound pressure level reduction.

The Analysis of the Unsteady Flow Field and Aerodynamic Sound of Fan Motor in a Vacuum Cleaner (진공청소기용 팬 모터의 비정상 유동 해석 및 공력소음 해석)

  • 김재열;심재기;송경석;오성민;양동조;김우진
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.04a
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    • pp.281-286
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    • 2004
  • The vacuum cleaner motor runs on very high speed for the suction power. Specially, the motive power is provided by the impeller being rotate on very high speed. And centrifugal fan consists of the impeller, the diffuser, and the circular casing. Due to the high rotating speed or the impeller and small gap distance between the impeller and diffuser, the centrifugal fan makes very high noise level at BPF and harmonic frequencies. In order to calculate the sound pressure of centrifugal fan, the unsteady flow data is needed. And Noise cause is dividing to fluid noise by exhaust flow of fan and vibration noise by rotational vibration of vacuum cleaner fan motor. Until now, measuring method has been used to measure vibration by the accelerometer; this method has been not measured for the vibration in some parts of brush and commutator because of motor construction and 3-D vibrating mode. This paper was purposed on the accurate analysis, using laser vibration analyzer,. By using this measured data of noise cause against the difficult part in old times, we would like to use for the design of silent fan motor.

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Characteristics of Flow-Induced Noise in the Suction Nozzle of a Vacuum Cleaner with a Double-Blade Fan (이중 블레이드 팬이 장착된 진공청소기 브러쉬의 유동소음 특성)

  • Park, I-Sun;Sohn, Chae-Hoon;Oh, Jang-Keun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.2
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    • pp.205-213
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    • 2011
  • The characteristics of noise generation in the suction nozzle of a vacuum cleaner are analyzed numerically and experimentally. First, the flow resistance induced by each element in the suction nozzle of a vacuum cleaner with a double-blade rotary fan is investigated numerically and its relation with flow-induced noise and suction performance is examined in an anechoic room. The flow resistance and vorticity in the suction nozzle are calculated, and it is found that they are closely related to flow-induced noise and that the upper limit of noise reduction is only 4 dBA. This upper limit can be achieved by changing the design of the brush nozzle. Two methods for noise reduction by enlargement of flow-inlet area and by optimization of the number of blades are tested. Finally, the effects of each method are verified experimentally.

Aeroacoustic Characteristics and Noise Reduction of a Centrifugal Fan for a Vacuum Cleaner

  • Jeon, Wan-Ho;Rew, Ho-Seon;Kim, Chang-Joon
    • Journal of Mechanical Science and Technology
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    • v.18 no.2
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    • pp.185-192
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    • 2004
  • The aeroacoustic characteristics of a centrifugal fan for a vacuum cleaner and its noise reduction method are studied in this paper. The major noise source of a vacuum cleaner is the centrifugal fan. The impeller of the fan rotates at over 30000 rpm, and generates very high-level noise. It was revealed that the dominant noise source is the aerodynamic interaction between the rotating impeller and stationary diffuser. The directivity of acoustic pressure showed that most of the noise propagates backward direction of the fan-motor assembly. In order to reduce the high tonal sound generated from the aerodynamic interaction, unevenly pitched impeller and diffuser, and tapered impeller designs were proposed and experiments were performed. Uneven pitch design of the impeller changes the sound quality while the overall sound power level (SPL) and the performance remains similar. The effect of the tapered design of impeller was evaluated. The trailing edge of the tapered fan is inclined. This reduces the flow interaction between the rotating impeller and the stationary diffuser because of some phase shifts. The static efficiency of the new impeller design is slightly lower than the previous design. However, the overall SPL is reduced by about 4 dB(A). The SPL of the fundamental blade passing frequency (BPF) is reduced by about 6 dB (A) and the 2$\^$nd/ BPF is reduced about 20 dB (A). The vacuum cleaner with the tapered impeller design produces lower noise level than the previous one, and the strong tonal sound was dramatically reduced.

Development of SRM Drive System for Built-in Car Vacuum Cleaners (차량용 Built-in 청소기용 SRM 드라이브 시스템 개발)

  • Lee, Young-Soo;Noh, Jeongmin;Lee, Daejin;Kim, Jaehyuck;Seon, Han-Geol;Han, Man-Seung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.3
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    • pp.193-198
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    • 2017
  • This paper discusses the design and control of a switched reluctance motor (SRM) drive system for a built-in car vacuum cleaner. The growing popularity of outdoor activities and recreation has led the automobile industry to expand technologies that increase the convenience of vehicles, and thus, a built-in car vacuum cleaner was introduced. However, the existing DC motor of a vacuum cleaning system has several disadvantages, such as maintenance cost and lifespan issues of its commutator-brush structure. An SRM can be a good alternative to the existing DC motor because of its high-speed capability, long lifespan, low maintenance cost, and high efficiency, among other advantages. A prototype SRM drive is designed and manufactured to verify its feasibility for use in a built-in car vacuum cleaning system. Dynamic simulation is conducted to determine the optimal switching angle for maximum efficiency and minimum torque ripple. Load test, noise measurement, and suction-power tests are also carried out.

A Study on the Structure Analysis of Up-Right Vacuum Cleaner Suction Nozzle Cover (UP-RIGHT 형 진공청소기 흡입구 커버의 구조해석)

  • 유동훈;조규종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.1074-1077
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    • 2004
  • This investigation is the result of a structural analysis by FEM and test to define the deformation mode of the Up-Right type Vacuum-Cleaner's Nozzle-Cover. In FEM analysis, 3 different conditions were considered separately, such as (1) Compressive force by Belt tension, (2) Friction heat between Belt and shaft and (3) Compressive force combined with heat. Throughout FEM analysis it was found that the deformation was caused by heat and it was proved through a simulation test with a real product.

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NUMERICAL STUDY OF TURBULENT FLOW IN A INTAKE PART OF VACUUM CLEANER WITH ROLLING BRUSH (회전브러시가 장착된 진공청소기 흡입장치의 난류유동에 대한 수치해석)

  • Park, Tae-Seon
    • Journal of computational fluids engineering
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    • v.17 no.2
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    • pp.58-64
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    • 2012
  • Turbulent flows in a intake part of vacuum cleaner are studied by RANS simulations. The governing equations are solved by the SIMPLE algorithm based on the finite volume method of the unstructured grid system. The predicted results show that the suction performance is closely related to the variation of flow structure in the intake part. In order to investigate for the cleaning of bedclothes and carpet without sticking, several design changes are applied. The introduction of a solid cylinder in the intake part changes vortical structures significantly. Based on this result, a new design with spiral brushes is proposed. The design shows a good behavior for the suction performance and the flow control.

Flow Analysis for the Performance Improvement of the Centrifugal Fan in a Vacuum Cleaner (진공청소기용 원심팬의 성능향상을 위한 유동해석)

  • Choi Y. K.;Park H. K.
    • 한국전산유체공학회:학술대회논문집
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    • 2004.10a
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    • pp.69-72
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    • 2004
  • The performance of the centrifugal fan in a vacuum cleaner is affected by the hydraulic loss, such as the friction loss, the recirculation loss and the impact loss etc., Those losses depend on the rotational speed of the impeller, the inlet and exit widths, the relative flow angles to the blade, the number of the blades and the geometry of the shroud and the diffuser. These parameters are complicatedly interrelated, so the experimental means in analyzing the fans are rather limited. In the present study, the flow analysis are done numerically by changing the relevant fan parameters. A commercial code, STAR-CD, is used for the calculations. It is seen from the analyses that the computational results agree well with the experimental results. The results obtained can be used for the basic design of a centrifugal fan.

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Noise Reduction Method and Sources of Cyclone Sound for Vacuum Cleaner (청소기용 Cyclone 소음원 및 저감방법)

  • Lee, Jun-Hwa;Hong, Seung-Gee;Joo, Jae-Man;Oh, Sang-Kyoung;Song, Hwa-gyu;Oh, Jang-Keun
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.4 s.97
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    • pp.452-456
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    • 2005
  • Cyclone is widely adopted in the vacuum cleaner, because of the simple structure, the high dust collection efficiency and its transparency feature, which can be shown to the customer. At past times, cyclone performance was represented by collection efficiency, flow rate, pressure drop etc. At recent times the noise problem is getting important as cyclone comes into home-appliances. In this paper, pressure drop of cyclone and it's noise were measured at the variation of the cyclone structure and the main sources of cyclone peak noise was found by experimental and numerical analysis. In addition, the structure for peak noise reduction was suggested and it is beneficial both pressure drop and noise reduction.

A Comparison of the PWM/PDM Control Scheme for Single Phase Switched Reluctance Motor for Vacuum Cleaner (청소기용 단상 SRM의 PWM/PDM 운전 기법 비교 고찰에 관한 연구)

  • Lee Yohan;Kim Sangyoung;Lim Junyoung;Kim Jungchul
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.419-422
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    • 2002
  • This paper compares PDM and PWM for single phase switched reluctance motor for vacuum cleaner. Generally, PWM control scheme Is preferred because of small torque ripple compared with PDM control scheme. However, as the motor speed of the vacuum cleaner is above 20,000[rpm], the torque ripple is not problem any more. PDM control scheme is better than PWM control scheme considering loss of power device and EMI.

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