JPH07282939A - Water infiltration detecting method for waterproof connector - Google Patents

Abstract

PURPOSE:To provide a water infiltration detecting method for a waterproof connector, capable of accurately detecting water infiltration into the connector by using a fluorescent whitening agent in the water infiltration detecting method for accurately detecting water which has infiltrated into the waterproof connector at the time of a waterproof test of the waterproof connector. CONSTITUTION:After a waterproof connector K having connector housings 1, 2 connected to each other is soaked in test liquid composed of a solution or water dispersing liquid including a fluorescent whitening agent, the waterproof connector is dried and the connector housings 1, 2 of the waterproof connector K are separated from each other. An ultraviolet ray is radiated inside the connector housings 1, 2 so as to detect light emission of the fluorescent whitening agent, thus detecting water infiltration inside the waterproof connector.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water infiltration detecting method for accurately detecting water invading the inside of a waterproof connector when conducting a waterproof test of a waterproof connector.

[0002]

2. Description of the Related Art Conventionally, in a waterproof property test of a waterproof connector, in order to confirm the water immersion inside the connector, as shown in FIGS. 4 and 5, the connector with a water drop c after being immersed in a water tank or the like is attached. The housings a and b were separated from each other to check the presence or absence of water inside.

This is because if the water droplets c adhering to the outside are attempted to be dried, even the water that has penetrated into the housing may be dried, so that the water droplets adhering to the outside of the housing can be wiped off. However, the water droplets that have entered the mutual gap when the connector housings a and b are coupled cannot be removed, and as shown in FIG. 5, the water droplet c ′ detected after the connector housings a and b are separated from each other is under test. There is a problem that it is difficult to determine whether the water has entered the housing or the water that has entered when the housing is removed.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the immersion of a waterproof connector in a test solution containing a fluorescent whitening dye prevents the water from entering the connector. An object of the present invention is to provide a method for detecting water ingress of a waterproof connector that can be accurately detected.

[0005]

In order to achieve the above-mentioned objects, the present invention provides the following:
After immersing the waterproof connector in which the connector housings are connected to each other in a test solution consisting of an aqueous solution or an aqueous dispersion containing a fluorescent whitening dye, the waterproof connector is dried, and the connector housings are separated from each other so that ultraviolet rays are emitted inside the connector housing. Is irradiated to detect the light emission of the fluorescent whitening dye adhering to the inside of the connector housing to detect the water immersion inside the waterproof connector. Further, as described in claim 2, it is preferable that the test liquid is jetted and immersed in the waterproof connector.

[0006]

In the method of detecting water ingress of the waterproof connector of the present invention, the waterproof connector in which the connector housings are connected to each other is dipped in a test solution consisting of an aqueous solution or an aqueous dispersion of a fluorescent whitening dye, and then dried. , The fluorescent whitening dye contained in the water that entered the connector housing during the test remains attached and remains in the connector housing even after drying. It is possible to detect a portion where water is attached. The fluorescent whitening dye can be detected easily and easily by irradiating the waterproof connector of the DUT with ultraviolet light using a UV lamp in a dark room, because the area where the fluorescent whitening dye is attached emits fluorescence. It is possible to make a reliable determination.

[0007]

【Example】

Test method (1) As a test liquid, an aqueous solution containing 0.1 to 0.5% by weight of a fluorescent whitening dye (Illuminal BSN Conc manufactured by Showa Kako Co., Ltd.) was prepared, and the test sample shown in FIGS. The test liquid is jetted from the nozzle of the high-pressure car wash machine to the waterproof connector K of the product, and immersed in each test position described below.
The waterproof connector K is a waterproof connector in which the connector housing 1 and the connector housing 2 are fitted to each other. Test conditions Test position (injected position) 3 points in A of FIG. 1, B of FIG. 2 and C of FIG. 3 A: Exposed part of side and bottom surface of lip packing B: Exposed part of lip packing housing lock C: Rubber plug Part Test liquid injection time 5 minutes at each position Test liquid injection pressure 9.8 MPa (100 kgf
/ Cm ² ) Test liquid temperature 70 ° C. Nozzle jet angle 15 ° with respect to connector fitting axis (2) After the water immersion test, the DUT is dried as it is to remove water. (3) Remove the fitting between the connector housings 1 and 2 of the DUT and use an ultraviolet lamp to connect the connector housings 1 and 2.
2. Irradiate the inside with ultraviolet rays and confirm the presence or absence of fluorescence due to the remaining of the fluorescent whitening dye.

As a result of conducting the above-mentioned test on various waterproof connectors, it was possible to clearly judge even a slight amount of water that could not be detected by the conventional test method. In the above example, the test solution is ejected from the nozzle of the high-pressure car wash machine to perform the test, but the waterproof connector of the DUT is immersed in a water tank filled with the test solution to test the water immersion state. You can also do it.

[0009]

According to the present invention, the fluorescent whitening dye contained in the water that has penetrated into the waterproof connector remains attached and remains in the connector housing even after drying. It can be detected easily and surely, and the efficiency of test and inspection work is significantly improved. Also,
Since the waterproof connector of the DUT is dried while the connector housings are still connected to each other, the connector housings are separated from each other to inspect for water. It is not necessary to take into consideration, the reliability of the inspection is remarkably improved, and even a small amount of water can be clearly detected, and there are great advantages such as obtaining data useful for improving product quality.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing test positions of a waterproof connector according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing another test position of the waterproof connector of FIG.

FIG. 3 is an explanatory view showing another test position of the waterproof connector of FIG.

FIG. 4 is an explanatory diagram of a water immersion test of a conventional waterproof connector.

5 is an explanatory view showing a state where the housings of the waterproof connector of FIG. 4 are separated from each other.

[Explanation of symbols]

 A, B, C Water immersion test position of waterproof connector K Waterproof connector 1, 2 Connector housing

Claims (2)

[Claims] 1. When conducting a water immersion test of a waterproof connector,
After immersing the waterproof connector in which the connector housings are connected to each other in a test solution consisting of an aqueous solution or an aqueous dispersion containing a fluorescent whitening dye, the waterproof connector is dried, and the connector housings are separated from each other so that ultraviolet rays are emitted inside the connector housing. And detecting the light emission of the fluorescent whitening dye adhering to the inside of the connector housing to detect the water infiltration of the inside of the waterproof connector. 2. The method for detecting water immersion in a waterproof connector according to claim 1, wherein the test liquid is jetted and immersed in the waterproof connector.