• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.1143-1147
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• 2004

A mechanical type pulsation dampener for the diaphragm metering pump has been developed. The pulsation pressure is an inevitable phenomenon for the positive displacement pump such as cam operated or solenoid operated metering pump. The pulsation pressure of the metering pump could be the noise source and would be harmful for the piping system which delivers hydraulic fluid. Developed pulsation dampener consists of three coil springs which have different spring constant and height each other. Depending on pressure magnitude of the piping system, total hydraulic pressure on damping diaphragm which compresses coil springs will be varied. Force equilibrium of the pulsation dampener will be set by manual by adjusting the compressed coil spring height. During the discharge stroke, pulsation dampener stores potential energy that is released as the pumping diaphragm back to an initial position during the suction stroke.

• 한국자기학회지
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• 제20권6호
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• pp.234-238
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• 2010

캠샤프트의 구동력을 활용한 기계식 연료펌프 시스템을 대체할 솔레노이드 격막 연료펌프는 최근 각광받고 있는 고효율 그린카 부품 중 하나이다. 하지만 솔레노이드 격막 연료펌프의 경우 왕복운동에 필요한 자속을 오직 솔레노이드에 의존하므로 전력소비가 비교적 큰 단점이 있다. 따라서 본 연구에서는 전력소모를 최소화 하기 위하여 영구자석형 VCA 연료펌프 시스템을 제안한다. 또한 상용전자기해석소프트웨어인 MAXWELL을 활용하여 유한요소 해석을 통해 기존의 솔레노이드 격막 펌프와의 전력소모 및 동적 성능을 비교 분석한다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회B
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• pp.3134-3138
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• 2007

The objective of this paper is to elucidate the characteristic performance of the mini-vacuum pump with various heights of eccentric shaft. The mini-diaphragm pump is composed of DC motor, eccentric shaft and diaphragm and it is operated by PCB panel. The height of eccentric shaft is changed that controls the quantities of air flow to improve the performance of vacuum pressure. This device is manufactured in order to embody the vacuum pressure with 200 mmHg. The heights of eccentric shaft which is used in present experiment are located in the range from 3 mm to 5.5 mm. The vacuum pressure distributions with each height of eccentric shaft was measured and the results were graphically depicted.

• 유공압시스템학회논문집
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• 제7권1호
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• pp.1-5
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• 2010

This paper presents the experimental results of the radial piston type oil pump with new mechanism for a metal diaphragm hydrogen compressor. Generally, metal diaphragm type hydrogen compressor systems are operated by oil hydraulic power. In this system an oil compensating pump has been demanded to compensate for a leakage oil head chamber. The metal diaphragm type hydrogen compressor consists of an oil compensating pump, commonly used hydraulic piston pump and driven by main crank shaft. The radial piston type oil compensating pump with new rolling contacted piston mechanism is developed and experimented. The developed piston element of the radial piston pump consists of piston, steel ball, return spring, two check valves, eccentric cam and ball racer. In this study, designed 4 type pistons as and orifice hole. Operating characteristics and pressure ripple characteristics are tested under no load to 60bar loaded with every 20bar increasing step and pressure ripple and flow rate are experimentally investigated.

• 한국항공우주학회지
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• 제34권3호
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• pp.22-30
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• 2006

본 논문은 초소형 비행체 날개 주위의 공기흐름 조절을 위한 IPMC 작동기로 구동되는 ZNMF 펌프의 체계적인 설계 및 해석 기법을 소개한다. IPMC는 낮은 인가전압에서 큰 굽힘 변위를 발생시키며, 공기 중에서도 작동이 가능하고, 작은 크기로 손쉽게 제작할 수 있기 때문에 소형 펌프의 작동 막으로 매우 적합한 재료이다. 본 연구에서는 수치해석 기법을 이용하여 최대 작동 체적을 발생시키는 IPMC 작동 막의 최적 형상을 찾고, 이러한 최적형상에 기초하여 슬롯을 갖는 ZNMF 펌프를 설계하였다. 이후 초소형 비행체의 비행속도, 펌프 작동 막의 구동 주파수(~ 40 Hz), 슬롯을 통과하는 공기의 속도 등을 이용하여 무차원화 된 진동수와 모멘텀 계수를 구하였고, 설계된 ZNMF 펌프가 초소형 비행체 날개의 공기흐름 조절에 적용이 가능함을 보였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부 C
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• pp.1017-1019
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• 1998

In this paper, the fabrication of a micropump with two giant magnetostrictive films of Sm-Fe and Tb-Fe is presented. The pump consist of one silicon wafer and one cover glass. The micropump consists of an actuator diaphragm, a paired nozzle and diffuser, and two through holes. The Structure of the micropump is fabricated by the chemical vapor deposition, the etching and the sputtering of the magnetostrictive films. The deflection of the actuator measured diaphragm is measured by using the laser vibrometer and the flow rate of the micro pump is observed by using a video microscope.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부 C
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• pp.1023-1025
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• 1998

This paper presents the fabrication of a micro pump consisting of a pair of Al f1ap wave and a phase change actuator. The phase change actuator is composed of a heater, a silicone rubber diaphragm and a working liquid chamber. The diaphragm is actuated by the evaporation and the condensation of the working liquid. The actuator pumps fluid through the valves. The micro pump is fabricated by the anisotropic etch, the boron deposition and the metal evaporation. The forward and the backward flow characteristics of the f1ap valves were obtained. Also, the flow rate of the micro pump has been measured. When the square wave input of 12 V, 60% duty ratio and 0.2 Hz is applied, the average flow rate is $0.15{\mu}{\ell}/sec$ for zero pressure difference.

• 한국가시화정보학회:학술대회논문집
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• 한국가시화정보학회 2007년도 추계학술대회
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• pp.59-62
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• 2007

The basic concept and preliminary performance results of a miniaturized electroosmotic (EO) pump with diaphragms were included in the present study. The separation of an electroosmotic pumping liquid from a drug using diaphragms is mainly to have a freedom in choosing an electroosmotic pumping liquid and to achieve the optimal drug delivery, and, preferably its precise control. We performed maximum flow rate, maximum pressure, and maximum current measurements with and without diaphragm designs. As a result, the effect of diaphragms on pump performance at the maximum condition is small. However, the presence of diaphragms does not allow indefinite continuous pumping.

• 한국유체기계학회 논문집
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• 제11권3호
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• pp.14-21
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• 2008

A numerical simulation on the flow field of a valveless bidirectional piezoelectric micropump has been performed. In this type of micropump, the oscillation of the piezoelectric diaphragm generates the blowing and suction flow through the oblique channel from the pumping chamber. The angle between the oblique and main channel causes the variation of flow distribution through upstream and downstream channels in suction and blowing modes. In the suction flow mode, the working fluid flows from both the upstream and downstream of the main channel to the pumping chamber through the oblique channel. However, in the blowing flow mode, the fluid pushed out of the pumping chamber flows more toward the downstream of the main channel due to the inertia of the fluid. In the present study, the effects of geometries such as the angle of oblique channel and the shape of main channel on the flow rate of the up/downstream were investigated. The flow rate obtained from the pump and the energy required to the pump were also analyzed for various displacements and frequencies of the oscillation of the diaphragm.

• 항공우주기술
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• 제13권2호
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• pp.160-166
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• 2014

액체로켓 엔진용 개폐밸브는 파일럿 공압으로 포핏을 열고 스프링 힘에 의해 닫음으로써 로켓엔진의 추진제 유량을 제어한다. 현재 개발 중인 엔진용 개폐밸브는 다이어프램 액추에이터에서 압력을 제거하면 닫히도록 설계되어 있다. 다이어프램을 설계하고 개발하기 위해 밸브가 열리고 닫히는 특성에 따라 수명을 분석할 필요가 있다. 밸브가 닫히기 시작하는 시점의 작동 유체의 압력을 결정하고, 포핏이 열리는 시점의 압력을 결정되어 힘평형이 설계되어 있다. 수명시험은 상온 유동에서 다이어프램부의 크랙에 의한 누설은 용접 부위에서 발생했다. 다이어프램 액추에이터의 작동 수명은 헬륨 파일럿 압력의 22 MPa 시험에서 61회이다.