This paper presents a new linear inertial acceleration switch which senses inertial
acceleration and gives a signal of switchpoint. It is an entire mechanical device has two particular
characters: a simple structure and an environmental interference-free capability. The structure and
work principle of the switch is introduced, then the design process to the spring is analyzed and
simulated, and finally the rationality of this acceleration switch's design is given according to the
sample's testing data.
In this acceleration switch, the elastic component is a leaf spring, and the mass component
is a standard steel ball. The spring and the ball are separated instead of rigidly connected, which
make the whole structure is simple. When the switch is on the work direction the ball and the
spring are interact, and the spring is on work; when the switch isn't on the work direction, the ball
and the spring are separated; environmental external force is on the mass instead of on the spring.
The spring is insusceptible on this condition. This particularity determines that the switch is highly
environmental interference-free, and doesn't easily affected by environmental influence.
Some parameters of the inertial switch are given as followings: (1) Overall dimension of the
inertial switch is about 28mm×12mm×12mm; (2) systemic precision of the inertial switch is 1.5%;
(3) the inertial switch can endure 0.2g2/Hz stochastic vibration. It is suggested that this inertial
switch can be applied in high consequence system.
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