KR20030050317A - The Connection Method of Pipes Using Shape Memory Alloy Coupling in A Unweldable Condition - Google Patents

The Connection Method of Pipes Using Shape Memory Alloy Coupling in A Unweldable Condition Download PDF

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Publication number
KR20030050317A
KR20030050317A KR1020010080730A KR20010080730A KR20030050317A KR 20030050317 A KR20030050317 A KR 20030050317A KR 1020010080730 A KR1020010080730 A KR 1020010080730A KR 20010080730 A KR20010080730 A KR 20010080730A KR 20030050317 A KR20030050317 A KR 20030050317A
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South Korea
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memory alloy
shape memory
alloy coupling
pipe
coupling
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KR1020010080730A
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Korean (ko)
Inventor
김정수
이균호
이승우
이주진
김진철
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한국항공우주연구원
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Priority to KR1020010080730A priority Critical patent/KR20030050317A/en
Publication of KR20030050317A publication Critical patent/KR20030050317A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
    • F16L13/147—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling by radially expanding the inner part

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)

Abstract

PURPOSE: A joining method of a pipe using a shape memory alloy coupling under a condition impossible to weld is provided to connect pipes easily and simply in a short time even under work conditions are impossible to weld. CONSTITUTION: In a joining method of a pipe using a shape memory alloy coupling(1) under a conditions impossible to weld, the surface and the ends of pipes(4,5) are smoothly trimmed and an installation position indication part(6) is indicated at a position of the surface of the pipe to install the shape memory alloy coupling, using a marking gauge. The shape memory alloy coupling maintained on a low expansion state is kept in an insulating box. The shape memory alloy coupling kept in the insulating box is inserted into the installation indication part of the pipe(5) and then the pipe(4) is inserted into the shape memory alloy coupling from the opposite side. Connection is fixed while the shape memory alloy coupling contracts.

Description

용접이 불가능한 조건에서 형상기억 합금 커플링을 이용한 배관의 접합 방법{The Connection Method of Pipes Using Shape Memory Alloy Coupling in A Unweldable Condition}The connection method of pipes using shape memory alloy coupling in a unweldable condition

본 발명은 용접을 이용해 배관들을 연결하는 기존의 방법 대신에 형상기억합금 커플링 (CryoFitⓒCoupling)을 이용해 배관들을 연결함으로써 용접이 불가능한 작업환경에서도 보다 짧은 시간 내에 쉽고 간편하며 확실하게 연결할 수 있도록 하는 용접이 불가능한 조건에서 형상기억 합금 커플링을 이용한 배관의 접합 방법에 관한 것이다.The present invention is to connect the pipes using the shape memory alloy coupling (CryoFit ⓒ Coupling) instead of the conventional method of connecting the pipes by welding to enable easy and simple and reliable connection in a short time even in a non-welding working environment The present invention relates to a pipe joining method using shape memory alloy coupling in a condition where welding is impossible.

현재 보편적으로 사용중인 용접은 주조나 리벳 등의 기타 접합 방법에 비해 작업공정 수 감소, 원재료 절약, 성능 및 수명의 향상 등에 유리하나 동시에 여러가지의 단점을 지니고 있다.Welding, which is currently in common use, is advantageous in reducing the number of working processes, saving raw materials, and improving the performance and lifespan, compared with other joining methods such as casting and rivets, but also has various disadvantages.

첫째, 작업부 주위를 높은 고온으로 가열해 녹여서 접합하므로 재질이 변질되고 냉각시 연결 부위에 잔류응력이 발생할 가능성이 높다.First, it is possible to heat the high temperature around the work area to melt and bond the material.

둘째, 작업 조건에 따라 용접부위에 기공이나 균열 등의 용접결함이 발생할 수 있으므로 이에 대한 비파괴 검사를 수행해야 한다.Second, welding defects such as pores or cracks may occur in the welded area depending on the working conditions. Therefore, a nondestructive inspection must be performed.

셋째, 작업자의 기술에 따라 연결부위의 강도와 품질이 좌우되므로 숙련된 작업자가 필요하다.Third, since the strength and quality of the connection portion depends on the skill of the operator requires a skilled worker.

넷째, 용접기 설치와 같은 사전 작업 준비 및 비파괴 검사에 많은 시간과 비용이 필요하다.Fourth, a lot of time and money are required for preliminary work preparation and non-destructive inspection such as welding machine installation.

다섯째, 이종 금속 및 비철 금속으로 이루어진 배관들에 대한 연결이 어렵다.Fifth, it is difficult to connect pipes made of dissimilar metals and nonferrous metals.

여섯째, 용접할 배관에 용접기 치구가 접근할 수 있는 여유 공간이 필요하다.Sixth, there is a need for a free space for the welder jig to approach the pipe to be welded.

위에서 제시한 용접의 단점들을 고려할 때, 이종 금속 및 비철 금속과 그 외플라스틱을 포함한 다양한 재질로 이루어진 배관들간의 연결이나 소형화, 집적화된 작업공간에서 용접 치구가 접근이 불가능한 경우 용접을 통해 배관 연결 작업을 수행하기가 어렵다.Considering the above-mentioned disadvantages of welding, pipe connection work through welding when the welding fixture is inaccessible in the connection, miniaturization, and integrated work space between pipes made of various materials including dissimilar metals and non-ferrous metals and other plastics Is difficult to carry.

본 발명은 주위 온도에 따라 형상이 변하는 형상기억 합금 커플링 (CryoFitⓒCoupling)을 이용함으로써 용접보다 작업 공정이 용이하며 짧은 시간 내에 확실하게 배관을 연결할 수 있도록 한다.The present invention uses a shape memory alloy coupling (CryoFit ⓒ Coupling) that changes the shape according to the ambient temperature to facilitate the work process than welding and to ensure a reliable pipe connection in a short time.

본 발명의 형상기억 합금 커플링 (CryoFitⓒCoupling)은 Aerofit Products사의 제품으로서 Tinel로 알려진 티타늄-니켈 계열의 합금으로 제작되며 일반적인 금속과 달리 저온에서는 팽창되어 있는 반면에 온도가 증가할수록 점점 수축되는 특성을 갖고 있다.Shape memory alloy coupling of the present invention (CryoFit ⓒ Coupling) is a product of Aerofit Products Inc. made of a titanium-nickel-based alloy known as Tinel and unlike the general metal is expanded at low temperatures, while shrinking with increasing temperature Have

따라서 팽창된 형상을 유지하기 위해서 평소 액체질소을 이용해 저온의 상태로 보관을 한다.Therefore, in order to maintain the expanded shape is usually stored in a low temperature state using liquid nitrogen.

또한 배관 내 작동 압력이 3000 psi 이상에서도 견딜 수 있도록 하는 것이다.It also ensures that the working pressure in the pipe can withstand more than 3000 psi.

도 1 은 본 발명의 형상기억 합금 커플링에 대한 사시도1 is a perspective view of a shape memory alloy coupling of the present invention

도 2 는 본 발명의 마킹 게이지에 대한 사시도2 is a perspective view of a marking gauge of the present invention;

도 3 은 본 발명의 단열박스에 대한 사시도3 is a perspective view of an insulating box of the present invention

도 4 는 본 발명중 배관에 설치위치를 표시한 상태의 정면도4 is a front view of a state in which an installation position is displayed on a pipe in the present invention;

도 5 는 본 발명중 배관의 일측으로 형상기억 합금 커플링이 연결된 상태도Figure 5 is a state memory alloy coupling is connected to one side of the pipe in the present invention

도 6 은 본 발명의 배관에 형상기억 합금 커플링이 연결된 상태도Figure 6 is a state memory alloy coupling is connected to the pipe of the present invention

[도면의 주요 부분에 대한 부호의 설명][Description of Symbols for Main Parts of Drawing]

1 : 형상기억 합금 커플링2 : 마킹 게이지1: shape memory alloy coupling 2: marking gauge

3 : 단열박스4 : 배관A3: insulation box 4: piping A

5 : 배관B6 : 설치위치 표시부5: Piping B6: Installation position display

본 발명은 배관을 연결해주는 형상기억 합금 커플링(1)이 도 1 과 같이 형성되며, 연결하는 동안 작업을 원활하게 도와주는 보조 도구로 구성되어 있다.The present invention is a shape memory alloy coupling (1) for connecting the pipe is formed as shown in Figure 1, it is composed of an auxiliary tool to help work smoothly during connection.

보조 도구는 도 2와 같이 형상기억 합금 커플링(1)을 연결하기 전에 배관A,B(4, 5)에 커플링의 설치 위치를 미리 측정해 표시할 수 있는 마킹 게이지(2)와 연결 작업동안 액체 질소와 커플링을 함께 보관해 커플링을 저온의 팽창상태로 유지시키는 도 3 의 단열박스(3), 액체 질소가 담겨진 단열박스로부터 안전하게 형상기억 합금 커플링(1)을 꺼낼 수 있는 집게 및 작업자를 보호하기 위한 폴리프로필렌 장갑 등으로 구성된다.The auxiliary tool is connected to the marking gauge 2 that can measure and mark the installation position of the coupling in advance on the pipes A and B (4, 5) before connecting the shape memory alloy coupling (1) as shown in FIG. Tweezers to safely remove the shape memory alloy coupling (1) from the thermal insulation box (3) of FIG. 3, where the liquid nitrogen and the coupling are kept together to keep the coupling at a low temperature expansion state, and the thermal insulation box containing liquid nitrogen. And polypropylene gloves for protecting workers.

형상기억 합금 커플링(1)을 이용한 배관의 연결 작업은 다음의 순서로 이루어진다.The connection of the pipe using the shape memory alloy coupling 1 is performed in the following order.

(1) 연결할 배관A(4)와 배관B(5)의 표면과 끝 단면을 깨끗하게 다듬는다.(1) Clean the surface and end section of pipe A (4) and pipe B (5) to be connected.

(2) 마킹 게이지(2)를 이용해 연결할 배관 표면에 형상기억 합금 커플링(1)이 설치될 위치에 설치 위치 표시부(6)를 도 5 와 같이 표시한다.(2) The installation position display part 6 is displayed as shown in FIG. 5 at the position where the shape memory alloy coupling 1 is to be installed on the surface of the pipe to be connected using the marking gauge 2.

(3) 액체 질소에 보관된 형상기억 합금 커플링(1)과 액체 질소를 필요한 양만큼 단열박스(3)에 덜어서 옮긴다.(3) Transfer the shape memory alloy coupling (1) and liquid nitrogen stored in liquid nitrogen to the insulation box (3) in the required amount.

(4) 폴리프로필렌 장갑 착용 후 스테인레스 스틸 집게를 이용해 단열박스(3)에서 형상기억 합금 커플링(1)을 꺼낸다.(4) After wearing polypropylene gloves, take out the shape memory alloy coupling (1) from the insulation box (3) using stainless steel tongs.

(5) 한쪽 배관B(5)에 표시한 설치 위치 표시부(6)까지 형상기억 합금 커플링(1)을 삽입한 후 나머지 배관A(4)을 형상기억 합금 커플링(1)에 연결한다.(5) After inserting the shape memory alloy coupling 1 to the installation position display portion 6 indicated on one pipe B 5, the other pipe A 4 is connected to the shape memory alloy coupling 1.

(6) 형상기억 합금 커플링(1)이 수축되면서 연결이 고정된다.(6) The shape memory alloy coupling 1 is contracted and the connection is fixed.

현재 개발중인 다목적실용위성 2호 추진시스템의 열구조시험 모델에서 실제로 형상기억 합금 커플링(1)을 이용해 인공위성 추진제 배관들을 성공적으로 연결하였다.In the thermal structural test model of the multipurpose practical satellite # 2 propulsion system, which is currently under development, we have successfully connected the satellite propellant pipes using the shape memory alloy coupling (1).

본 발명은 용접을 이용해 배관들을 연결하는 기존의 방법 대신에 형상기억 합금 커플링을 이용해 배관들을 연결함으로써 용접이 불가능한 작업환경에서도 보다 짧은 시간 내에 쉽고 간편하며 확실하게 연결할 수 있는 방법에 관한 것이다.The present invention relates to a method that can be easily, simply and reliably connected in a shorter time even in a non-welding working environment by connecting pipes using shape memory alloy couplings instead of conventional methods of connecting pipes using welding.

실제로 현재 개발중인 다목적실용위성 2호 추진시스템의 열구조 시험모델에 적용한 결과, 기존의 TIG 용접에 비하여 간결하고 짧은 시간 내에 적은 비용으로 신뢰성 높은 연결을 이룰 수 있었으며, 또한 이종의 금속으로 이루어진 배관에도 적용이 가능했기에 향후의 인공위성뿐만 아니라 다양한 분야에서 배관의 연결 및 조립시 직접적으로 경제적, 기술적 파급효과를 낳을 수 있다.In fact, as a result of applying to the thermal structural test model of the multipurpose practical satellite No. 2 propulsion system currently being developed, it was possible to make a reliable connection in a shorter time and at a lower cost than the conventional TIG welding, Since it was possible to apply, it can have direct economic and technical ripple effect when connecting and assembling pipes in various fields as well as satellites in the future.

본 발명의 형상기억 합금 커플링은 용접과 비교해 다음과 같은 장점과 효과를 제공한다.The shape memory alloy coupling of the present invention provides the following advantages and effects compared to welding.

첫째, 두 배관사이에 단순히 삽입하여 연결하기 때문에 용접보다 설치가 아주 간편하며 사전 준비 작업에 걸리는 시간과 비용이 적게든다.First, installation is simpler than welding because it is simply inserted between two pipes, and it takes less time and money to prepare.

둘째, 온도가 증가할수록 형상기억 합금 커플링은 수축되기 때문에 배관에 손상을 주지 않고 반경방향으로 균일한 힘을 가함으로써 반영구적인 연결이 가능하다.Second, since the shape memory alloy coupling shrinks with increasing temperature, semi-permanent connection is possible by applying a uniform force in the radial direction without damaging the pipe.

셋째, 작업완료 후 작업자가 직접 눈으로 연결을 확인하는 것이 가능하기 때문에 보다 쉽고 빠르게 검사를 수행할 수 있다.Third, since the operator can directly check the connection after the work is completed, the inspection can be performed more easily and quickly.

넷째, 다양한 재질로 이루어진 배관들 간의 연결이 자유롭고, 좁은 공간에서도 연결 작업이 수행 가능하다.Fourth, the connection between the pipes made of various materials is free, and the connection work can be performed even in a narrow space.

Claims (1)

형상기억 합금 커플링을 이용한 배관의 접합에 있어서,In joining pipes using shape memory alloy coupling, 형상기억 합금 커플링(1)이 배관A, B(4, 5)에 설치될 위치를 마킹 게이지(2)로 설치 위치 표시부(6)를 표시하는 설치위치 표시과정과,An installation position display process of displaying the installation position display unit 6 with the marking gauge 2 at the position where the shape memory alloy coupling 1 is to be installed in the pipes A and B (4, 5); 단열박스(3)에서 액체 질소로 저온의 팽창상태로 유지되는 형상기억 합금 커플링(1)을 보관하는 과정과,A process of storing the shape memory alloy coupling (1) which is maintained at a low temperature expansion state with liquid nitrogen in the insulation box (3), 상기 단열박스(3)에 보관되는 형상기억 합금 커플링(1)을 배관B(5)의 설치 위치 표시부(6) 만큼 삽입한 후 반대편에서 배관A(4)를 삽입함을 특징으로 하는 용접이 불가능한 조건에서 형상기억 합금 커플링을 이용한 배관의 접합 방법.The shape memory alloy coupling (1) stored in the heat insulation box (3) is inserted by the installation position indicator (6) of the pipe B (5) after the welding characterized in that the pipe A (4) is inserted from the opposite side Pipe joining method using shape memory alloy coupling under impossible conditions.
KR1020010080730A 2001-12-18 2001-12-18 The Connection Method of Pipes Using Shape Memory Alloy Coupling in A Unweldable Condition KR20030050317A (en)

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Cited By (3)

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RU2795352C1 (en) * 2022-12-28 2023-05-03 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский авиационный институт (национальный исследовательский университет)" Method for connecting autonomously charged cooling circuits of nuclear power plants
US11788655B2 (en) 2021-07-20 2023-10-17 General Electric Company Tube coupling
US11802640B2 (en) 2021-07-20 2023-10-31 General Electric Company Tube coupling

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JPH0280883A (en) * 1988-09-13 1990-03-20 Nkk Corp Tube fitting
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11788655B2 (en) 2021-07-20 2023-10-17 General Electric Company Tube coupling
US11802640B2 (en) 2021-07-20 2023-10-31 General Electric Company Tube coupling
RU2795352C1 (en) * 2022-12-28 2023-05-03 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский авиационный институт (национальный исследовательский университет)" Method for connecting autonomously charged cooling circuits of nuclear power plants

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