Three major properties of waterproof connectors

Waterproof connector three major properties, waterproof connector three major properties are mechanical properties, electrical properties and environmental performance. 1. Environmental performance: common environmental performance, including temperature resistance, humidity resistance, salt spray resistance, vibration and shock, etc.. Temperature resistance: the current waterproof connector operating temperature of 200 ℃ (except for a few high-temperature special waterproof connector), the temperature is -65 ℃. As the waterproof connector work, the current generates heat at the point of contact, due to the waterproof connector work, the current generates heat at the point of contact, resulting in a temperature rise, so it is generally believed that the operating temperature should be equal to the ambient temperature and the temperature rise of the contact point and the sum of the temperature rise. In some specifications, specify the waterproof connector in the rated operating current under the allowable temperature rise. Salt spray resistance: waterproof connectors in the environment containing moisture and salt work, its metal structural components, contact surface treatment layer may produce galvanic corrosion, affecting the physical and electrical properties of waterproof connectors. In order to evaluate the ability of electrical waterproof connectors to withstand this environment, the salt spray test is specified. It is a waterproof connector suspended in a temperature-controlled test chamber, with a specified concentration of sodium chloride solution sprayed with compressed air, the formation of salt spray atmosphere, the exposure time specified by the product specification, at least 48 hours.

Waterproof head function of vibration and shock: vibration and shock resistance is an important performance of electric waterproof connector, in special application environments such as aviation and aerospace, railroads and road transportation is particularly important, it is to test the electric waterproof connector mechanical structure of the ruggedness and reliability of the electrical contact of the important indicators. There are clear provisions in the relevant test methods. Peak acceleration, duration and shock pulse waveform should be specified in the impact test, as well as the time of interruption of electrical continuity. Resistance to humidity The intrusion of moisture affects the connection h insulation properties and corrodes metal parts. Constant humidity and heat test conditions for the relative humidity of 90% ~ 95% (according to product specifications, up to 98%) temperature +40 ± 20 ℃, the test time according to product regulations, at least 96 hours. Alternating humidity and heat test is more demanding. 2, mechanical properties: in terms of connection function, insertion and extraction force is an important mechanical properties. Insertion force is divided into insertion force and pull-out force (pull-out force is also known as separation force), the two requirements are different. Insertion force should be small (thus there are low insertion force LIF and no insertion force ZIF structure), while the separation force is too small, it will affect the reliability of contact. Another important mechanical property is the mechanical life of the waterproof connector. Mechanical life is actually a durability (durability) indicators, in the national standard GB5095 called it mechanical operation. It is inserted and pulled out as a cycle, in order to specify the insertion and removal cycle after the waterproof connector can normally complete its connection function (such as contact resistance value) as a basis for judgment. Waterproof head function waterproof connector insertion and extraction force and mechanical life and contact structure (positive pressure size) contact parts coating quality (sliding friction coefficient) and contact arrangement size (alignment).3. Electrical properties of waterproof connectors, the main electrical properties, including contact resistance, insulation resistance and resistance to electric strength. ① insulation resistance measure of electrical waterproof connector between the contact parts and contact parts and the shell of the insulation between the indicators, the order of magnitude of hundreds of megohms to thousands of megohms ranging. ② resistance or voltage, dielectric withstand voltage, is characterized by waterproof connector between the contact or between the contact and the shell to withstand the rated test voltage. ③ contact resistance of high-quality electrical waterproof connector should have a low and stable contact resistance. Waterproof connector contact resistance from a few milliohms to tens of milliohms.

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