The reliability of the machine design, a reasonable selection of components. First according to the degree of importance of the whole system reliability requirements, environmental conditions, and costs and other requirements of the comprehensive consideration and selection.Elinker Electric expert analysis options must pay attention to the following aspects.

Environmental conditions on the use of choice

Environmental conditions, mainly refers to the temperature, humidity, low air pressure, vibration, shock, and so on. The quality of the environmental conditions have tremendous impact on relay reliability.

1.1 The influence of temperature on the relay

Relay component is afraid of the heat, high temperature can accelerate the aging of the relay internal plastic and insulating material, contact oxidation corrosion extinction difficulties, deterioration of electrical parameters, the lower the reliability, therefore, to design the relay Do not go near the heating element, and good ventilation conditions. Proved for some domestic production of the Ministry of standard low-power relay, although the conditions require a low temperature to -55 ° C, but in fact relay under this condition can not normally convert, it is recommended to leave the choice to sufficient margin for military electronic machine, suggested the use of the products of the GJB.

1.2 Low pressure relay

Under low pressure conditions, the deterioration of the relay cooling conditions, the coil temperature, the relay to pull, the release of the parameter changes, affecting the normal work of the relay; low pressure also allows the relay insulation resistance is lowered, the contacts extinction difficulties, easy to make contact Shaorong, affecting the reliability of the relay. For the use of more environmentally harsh conditions, it is recommended that the way the whole seal.

1.3 Mechanical stress on the relay

Electromagnetic relays are reed cantilever structure and low natural frequency of vibration and shock can cause resonance, resulting in the pressure drop of relay contacts, prone to instant disconnect or contact the jitter, can cause serious structural damage, The movable part of the armature can produce malfunction, affecting the reliability of the relay. Recommended that designers try to take the anti-vibration measures to prevent a resonance.

2,Reasonable selection of the relay quality grade

Different quality levels of the components, its Quality coefficient πQ and different. Quality coefficient of component failure rate can be seen from the above equation, so the requirements in the choice of components, according to the reliability of the whole system requirements, select the components of the quality grade.

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