A high thermal change rate of test apparatus aims to realize test equipment
requirement of highly accelerated life test(HALT) and highly accelerated
stress screening(HASS). Structurally, the apparatus is provided with a
cabinet body with an interior for placing test specimen. The cabinet body
is provided with elements of fans, electric heating tubes and liquid
nitrogen nozzles therein. The positions of the cabinet body and the
control system are separate. Several groups (normally 2 or 3 groups,
depends on the size of cabinet) of liquid nitrogen pipes connecting the
cabinet body are flexible stainless steel pipes for enclosing and
insulating sleeve tubes. During full-speed temperature cooling, all groups
of the pipes simultaneously eject liquid nitrogen. When temperature is
constant, only one group of liquid nitrogen pipe with cryogenic valve and
nozzles is used and micro-adjusted to achieve good temperature stability.
The cabinet body can match different types of shaker combinations to
perform temperature/vibration test with high transition rate of
temperature, and be used as a single high thermal change rate of
temperature cabinet, can have relatively great assembly flexibility in
response to test requirement. The entire apparatus has higher mobility and
flexibility than conventional temperature/vibration cabinets.
