JPS63285438A - Test of air leak in liquid - Google Patents

Abstract

PURPOSE:To enable detection of a possible air leak accurately along with a shortened testing time, by performing a test in a liquid or applying an ultrasonic vibration to an object to be tested to prevent the adhering of bubbles to the test object. CONSTITUTION:Pipes 21 and 22 connected to a valve as object to be tested on the upstream and downstream sides thereof are connected to a compressor as air pressure source and a shut-off valve and the pipe 22 is made to run through the bottom wall of a water tank 10 through a packing 12. In a test, after the object 20 being tested is set underwater, an ultrasonic vibrator 30 is driven to remove bubbles adhering to the object 20 being tested. Then, when monitoring a leak feeding air into the object 20 being tested from the air pressure source, the ultrasonic vibrator 30 is driven continuously during the operation to check whether bubbles rise up the water. Depending on the presence of bubbles, acceptance of the test object is judged.

Description

Translated fromJapanese

【発明の詳細な説明】ｌｌ上μｍと」本発明は、容器や管等の空気漏れを試験する方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of testing containers, pipes, etc. for air leaks.

従来の技術容器の壁面にクラックやピンホールなどの欠陥が存在す
るか否かを検査する方法として、その容器を密閉して液
中におき、その内部に空気を送り込んで欠陥があった場
合に漏れ、出す気泡を目視または光学的に検出する方法
が公知であり、例えば、特開昭５９−１０５５３４号「
空気漏れ試験方法および装置」に開示されている。Conventional technology: As a method of inspecting whether there are defects such as cracks or pinholes on the wall of a container, the container is sealed and placed in liquid, and air is pumped into the interior to detect defects. A method of visually or optically detecting leakage or emitted bubbles is known, for example, as described in Japanese Patent Application Laid-Open No. 59-105534 "
Air Leak Test Method and Apparatus".

発明が解決しようとする問題点ところで、このような試験を行なう場合、先ず被試験体
を液中に入れた際、被試験体表面部の空気層がそのまま
気泡となって付着し、それが試験中に被試験体から離れ
て浮き上がることがあり、欠陥による気泡と誤認されて
しまう問題点があった。これを避けるには、その気泡を
手またはブラシなどにより除去すればよいが、被試験体
によっては完全に取除くことが不可能な場合があり、特
に欠陥が小さい場合は誤認の恐れが避けられなかった。Problems to be Solved by the Invention By the way, when conducting such a test, first, when the test object is placed in a liquid, the air layer on the surface of the test object becomes bubbles and adheres to the test object. There was a problem in that the bubbles could sometimes float away from the test object, causing them to be mistaken for bubbles caused by defects. To avoid this, the air bubbles can be removed by hand or with a brush, but depending on the test object, it may be impossible to completely remove them, and especially if the defect is small, it may be necessary to avoid the risk of misidentification. There wasn't.

またこのような気泡が完全に除去できた場合でも、空気
の漏れ出しが少ない場合は、その漏れた気泡が被試験体
に付着したままとなり、長時間経ないと気泡として検知
ができな−１という問題があった。Furthermore, even if such air bubbles can be completely removed, if there is only a small amount of air leaking out, the leaked air bubbles will remain attached to the test object and cannot be detected as air bubbles until a long period of time has elapsed. There was a problem.

問題点を解決するための手段本発明は、上記問題点を解決するために、液中あるいは
被試験体に超音波振動を与えながら試験を行なうように
したものであり、この超音波振動により被試験体に付着
した、あるいは付着しようとする気泡を剥離させるもの
である。Means for Solving the Problems In order to solve the above problems, the present invention conducts tests while applying ultrasonic vibrations to the liquid or to the test object. This removes air bubbles that have adhered or are attempting to adhere to the test specimen.

実施例本発明の方法を実施するための装置例を示す＠ｉ図にお
いて、２０は被試験体であるバルブでのり、その上、下
流側と接続された管２１．２２はそれぞれ図示されてい
ない空圧源であるフンプレッサと開閉パルプに結合され
ている。尚、この結合に際し、管２２はあらかじめ水槽
１０の底壁なパツキン１２を介して貫通させである。３
０は水槽１０の底壁上に設置された超音波振動子であり
、それから発振した超音波を水槽１０、水１１に与えて
いる。以上のものにおいて、試験は先ず、被試験体２０
を前記の如く水中に設置し゛た後、超音波振動子３０を
駆動し、被試験体２０に付着した気泡の除去を行なう。Example In the diagram showing an example of an apparatus for carrying out the method of the present invention, 20 is a valve as a test object, and pipes 21 and 22 connected to the downstream side are not shown. It is connected to the air pressure source, the air pressure source, and the opening/closing pulp. Incidentally, upon this connection, the pipe 22 is passed through the bottom wall of the water tank 10 through the gasket 12 in advance. 3
0 is an ultrasonic vibrator installed on the bottom wall of the aquarium 10, and gives the aquarium 10 and water 11 ultrasonic waves oscillated from it. In the above, the test first begins with the test object 20.
After placing the test object 20 in water as described above, the ultrasonic vibrator 30 is driven to remove air bubbles attached to the test object 20.

次に、空圧源から被試験体２０内に空気を送り込みなが
ら漏れを監視するに際し、その間連続的に超音波振動子
３０を駆動し、そのとき水中を通って気泡が浮き上がる
か否かを監視し、その有無に基づき合否の判定を行なう
。尚、この場合、超音波振動子３０を、被試験体２０に
直接または治具等を介して接触させるようにしても同様
である。Next, when monitoring for leakage while feeding air into the test object 20 from the pneumatic source, the ultrasonic vibrator 30 is continuously driven during this time, and it is monitored whether or not air bubbles float up through the water. A pass/fail judgment will be made based on the presence or absence of the above. In this case, the same effect can be achieved even if the ultrasonic transducer 30 is brought into contact with the test object 20 directly or via a jig or the like.

、発明の効果以上のとおりであり、本発明は液あるいは被試験体に超
音波振動を与えながら試験を行なうので、被試験体への
気泡の付着がなく、確実に空気漏れの有無が検出でき、
かつ試験時間を短縮することができる。The effects of the invention are as described above, and since the present invention performs the test while applying ultrasonic vibration to the liquid or the test object, there is no air bubbles attached to the test object, and the presence or absence of air leaks can be reliably detected. ,
Moreover, the test time can be shortened.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の方法を実施するための装置例を示す正
面図である。１０：水槽２０：被試験体３０：ｆｆｉ音波振動子FIG. 1 is a front view showing an example of an apparatus for carrying out the method of the present invention. 10: Water tank 20: Test object 30: ffi sound wave vibrator

Claims (1)

Translated fromJapanese

【特許請求の範囲】[Claims]１、液中に被試験体を設置し、被試験体内から液中への
気泡の漏れ出しの有無を目視または光学的手段により検
出する液中空気漏れ試験方法において、液中あるいは被
試験体に超音波振動を与えながら試験を行なうことを特
徴とする液中空気漏れ試験方法。1. In the air leak test method in which a test object is placed in a liquid and the presence or absence of leakage of air bubbles from the test object into the liquid is detected visually or by optical means, A method for testing air leakage in liquid, which is characterized by conducting the test while applying ultrasonic vibrations.