Axial lock structure of pyrotechnic cylinder

Abstract

The invention provides a fire actuator axial direction location locking structure and belongs to the technical field of the initiating explosive devices design. The locking structure comprises an actuator shell body, a piston rod, a spring clamp and a sealing cover. The actuator shell body is provided with a locating raised stage. The sealing cover blocks the actuator shell body from a first end of the actuator shell body and forms a limiting cavity with the locating raised stage. The spring clamp is located in the limiting cavity. The piston rod is located in the inner cavity of the actuatorshell body and a first end penetrates through the spring clamp and the sealing cover and out the actuator shell body. The second end of the piston rod is provided with a piston plate. The piston rod is further provided with a ring-shaped locating groove and a gap is existed between the locating groove and the piston plate. As the piston rod sliding in the axial direction, when the locating groovereaches the limiting cavity, the spring clamp retracts and covers the locating groove and locks the axial position of the piston rod. According to the fire actuator axial direction location locking structure, a trapezoid-shaped slot in the piston rod is not need to be arranged, the application range is wide and sealing is easy to achieve.

Description

technical field [0001] The invention relates to an axial locking structure of a long-life pyrotechnic cylinder with small space requirements, which belongs to the technical field of pyrotechnic product design and can be applied to the fields of aerospace, watercraft, safety and lifesaving, and the like. Background technique [0002] The pyrotechnic device is widely used in the field of national defense, relying on the combustion of gunpowder, it can release a considerable amount of energy in a very short period of time, and convert it into mechanical energy to output work to complete the predetermined program action. The pyrotechnic cylinder is a kind of pyrotechnic device, which converts the energy generated by the combustion of gunpowder into force and displacement, and realizes the movement of the connected parts. [0003] Among them, the pyrotechnic actuator that outputs axial displacement is the most common, and this type of actuator often needs to have an axial in-posi...

AI Technical Summary

Problems solved by technology

[0005] Although the traditional equal-section spring retaining ring or shaft retaining ring can meet the requirements of axial locking, when it is applied to the case of small size and high bearing capacity, the ratio of its inner and outer diameters is small, and the strain far away from the opening is relatively large, so it is difficult to operate for a long time. In the deformed state, the elastic loss is serious, which cannot meet the storage period requirements of aerospace explosives for more than 10 years

The common solution is to set a trapezoidal groove at the initial position of the motion shaft. The spring retaining ring is in a free state in the initial state without elastic deformation. During operation, the retaining ring opens through the ramp of the trapezoidal groove, but this method cannot meet some sealing requirements or Products for which the piston rod cannot be grooved

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