• 제목/요약/키워드: 공압밸브

검색결과 75건 처리시간 0.036초

다이어프램형 방식의 파일럿 액추에이터 개발 (Development of a diaphragm type actuator)

  • 이중엽;정대성;한상엽
    • 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.

화력발전소 흡입필터 세정용 급속 배기 밸브의 개발 (Development of the Quick Exhaust Valve to Blowing the Intake Filter for the Thermal Power Plant)

  • 정찬세;이형욱;정영만;이창돈;양순용
    • 한국생산제조학회지
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    • 제19권4호
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    • pp.548-552
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    • 2010
  • The air suction filter of the power plant decrease the dust and impurities of suction air that reduce the life and efficiency of the boiler. The suction efficiency of the air filter falls with the dust and impurities when the time of use comes to be long. Therefore, the various contaminant of the filter must remove periodically. This paper presents a developed quick exhaust valve to use in the thermo-electric power plant. to removing contaminants on the filter, the blowing is done shortly by air pressure. The Air flowed out to the out side from the inside of the filter. The performance test of the developed valve is done by making a test-bench according to JIS and KS standards. The efficiency is found higher than the existing related valve.

산화제 개폐밸브의 극저온 유동시험에서 채터링의 고찰 (A Study on the Chattering under Cryogenic Flow Test of a Oxidizer Shutoff Valve)

  • 이중엽;한상엽;이수용
    • 항공우주기술
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    • 제12권2호
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    • pp.108-117
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    • 2013
  • 가스발생기용 산화제 개폐밸브는 파일롯 공압으로 포핏을 열고 스프링 힘에 의해 닫음으로써 로켓엔진의 추진제 유량을 제어한다. 현재 개발 중인 산화제 개폐밸브는 액추에이터에서 압력을 제거하면 닫히도록 설계되어 있다. 그러므로 밸브의 성능을 평가하기 위해 밸브가 열리고 닫히는 특성에 따라 힘 평형 상태를 분석할 필요가 있다. 밸브가 닫히기 시작하는 시점의 작동 유체의 압력을 결정하고, 포핏이 열리는 시점의 압력을 결정되어 힘평형이 설계되어 있다. 인증시험 수준에서의 극저온 유동 시험 하에서 채터링 현상은 금속 기밀부에서 다량의 누설이 발생했다. 힘평형 계산을 이용한 산화제 밸브의 채터링이 발생된 시점의 압력은 약 11 bar로 예측 된다.

공압 전자밸브 신뢰성 평가기준 개발 (Reliability assessment standard development of pneumatic valves)

  • 강보식;성백주;김도식;조정대;김형의
    • 한국신뢰성학회:학술대회논문집
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    • 한국신뢰성학회 2001년도 정기학술대회
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    • pp.105-111
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    • 2001
  • In this study, for improvement of pneumatic valve reliability, we grasped the falling-off problem in efficiency of domestic valve and performed detailed analysis the relating International standards, and we also decided sampling method and reliability evaluation items to be evaluated valves. And, in addition, we describe the developed evaluation standard to increase the competition power and to improve the reliability of domestic pneumatic valve manufacturers through deciding of test conditions and thesis of evaluation procedures to each evaluation items.

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에너지 절약 시스템 공압 서보 액추에이터 개발 (Development of Pneumatic Servo Actuator for the Energy saving system)

  • 배성우;김동수;김명섭
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회A
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    • pp.1428-1432
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    • 2007
  • The object of this paper is development of pneumatic servo actuator technique for energy saving type. In this paper, consist of pneumatic servo actuator technique is pneumatic servo valve, pneumatic motor and cylinder. This technique applied a automobile, aerospace engineering, a ship, defence industry and industrial machine because it have high response, high speed, high precision control, low friction etc., compare with previously technique. But it depend on import the whole quantity. So this study, suggest that through the development of servo actuator applicable the use of industrial field.

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공압서보밸브 KS규격 정립에 관한 연구 (A Study of Korean (Industrial) Standards for Pneumatic Servo Valve)

  • 김동수;이원희;최병오
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.1231-1234
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    • 2003
  • Pneumatic servo valve which is widely applied in industrial world is advanced technology compounded with electric, electronic and machine. And It is consist of Linear Force Motor. Spool Commutation Mechanism and Microprocessor. In this study, we accomplished test method of Linear Force motor test, Static characteristic test, Dynamic characteristic test for KS(Koran industrial standard) of Pneumatic servo valve. we accomplished study about the main item of Static characteristic test which is related to unload flow characteristic test. And Dynamic characteristic test was step input test and frequency response test. Specially about frequency response test, There was a difficulty resulting from the time delay problem caused by the basic compressibility of air. In order to solve the problem in this study. we proposed two methods. First, displacement of the servo valve spool was directly measured by using a laser sensor. Second, method of calculating control flow by measuring pressure and temperature of chamber.

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비례제어밸브를 이용한 유압모터 부하계의 마찰토크 해석 (Friction Torque Analysis of a Hydraulic Motor-Load System using Proportional Control Valve)

  • 유환신;박형배
    • 한국항행학회논문지
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    • 제14권5호
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    • pp.760-766
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    • 2010
  • 본 논문에서는 유압 비례 제어 밸브로 구동되는 유압모터 부하계에 존재하는 정지마찰토크와 점성마찰토크를 해석하였다. 이에 기초 실험으로 유압시스템의 에너지인 압력과 유량에 대한 특성실험을 수행하였고, 공압브레이크 시스템을 이용하여 브레이크 압력의 변화를 인가하여 마찰토크의 변화를 실험하였다. 비선형마찰과 선형마찰에 대한 해석은 유압 시스템의 마찰특성에 대하여 수행하였다.

개비온 끝단 소둔선 결합용 이송 가이드 장치 개발 연구 (Development of Transportational Guide System for Joining Small Wire with Gabion)

  • 이종길
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2006년도 춘계학술대회 논문집
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    • pp.51-52
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    • 2006
  • Gabion can be used for the purpose of preventing overflow of river and side loss of road. However the manufacturing process of the gabion is manually controlled especially to the joining process at the terminal part of gabion with small diameter wire. In this paper automatic feeding guide system was designed and fabricated to make automation. The fabricated system was tested in the factory level. Pneumatic system was considered as the main idea of the feeding system. 3/2-way and 5/2-way manual control valve, eight double-acting cylinders were used. Based on the theoretical simulation and actual test the fabricated system was well controlled. The system was applied to the patent.

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공압 쿠션 실린더의 충격압 흡수를 위한 스프링형 니들밸브의 동특성에 관한 연구 (Simulation Study on Dynamic Analysis of Spring Type Needle Valve to Absorb Surge Pressure in Pneumatic Cushion Cylinder)

  • 이재구;;이준;이재천;신현명
    • 유공압시스템학회논문집
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    • 제2권1호
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    • pp.15-22
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    • 2005
  • The purpose of this study is to find the effective dynamic characteristics of an improved pneumatic cushion cylinder with a spring type needle valve. The dynamic model represented the peak pressure control method when the pneumatic cushion cylinder is moving forward or backward in the horizontal direction. It was found from the simulation results that the peak pressure in the cushion chamber is affected by the spring, which helps to understand the performance of the pneumatic cushion cylinder and to improve or design a better cushion needle valve component. From the simulation results, the stability of pneumatic cushion cylinder with a spring type needle valve was superior and its cushion capability was also better than that without the spring.

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압력조절밸브와 배관 특성을 포함한 유도무기용 기체 블로우다운 시스템의 공압부 모델링에 관한 연구 (A Study on Modeling of the Pneumatic Part in a Gas Blow-Down System Including Pressure Regulator and Pipe-Line Characteristics)

  • 박영우
    • 드라이브 ㆍ 컨트롤
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    • 제14권3호
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    • pp.32-39
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    • 2017
  • In this study, a mathematical model of the pneumatic part in a gas blow-down system is proposed. The mathematical model consists of four major parts: pressure vessel, reservoir, pressure regulator and pipe-line. To ensure accuracy in long-time simulations, heat transfer between gas and pressure vessel is considered. The model is validated by comparing simulation results with experimental data. Experiments are conducted on the ground, where free convection can be assumed. Simulation results indicate the proposed model can accurately describe behavior of a gas blow-down system. Therefore, it may be used for design and analysis of similar systems with a slight modification.