SU758295A1 - Switch drive - Google Patents

Description

The invention relates to the field of special electrical equipment, in particular to explosive electrical apparatus.

Known actuators of electrical switches, in which the pushing rod is located at the end of the piston, moving in the cylinder by the pressure of gases released ⁵ when the igniter charge ignites and flows through the pipeline into the cylinder [1]. However, in such drives, the energy released by the squib charge is not fully used. The kinetic energy of the jet of gas-call ₁₀ issuing from the nozzle cutter largely expended in overcoming the hydraulic resistance of the pipeline. At a sufficiently high speed of movement of the piston with the rod, its kinematic energy at the end of the working path is perceived in. the impact of either the end walls of the cylinder or the elements of a controlled device, which may lead to premature wear of parts of the actuator or controlled device. In addition, such drives also do not solve the problem of preventing the involuntary movement of the control element of the switch.

2

Known to drive an electric switch, in which the pushing rod is located at the end of the piston moving in the cylinder by the pressure of gases released during ignition of the charge of the squib mounted in the end wall of the cylinder [2]. The kinematic energy of the piston at the end of its working stroke is perceived by a deformable damper made of plastic material.

However, even in this drive the problem of preventing the involuntary movement of the control element of the switch is not solved.

The aim of the invention is to improve the reliability of the drive by eliminating the possibility of involuntary movement of the control element of the switch.

To achieve this goal, an electric switch actuator containing a stationary cylinder with a pyro cartridge fixed in its end wall, a piston moving in a cylinder with a pushing rod, a switch control element and a kinematic energy damper made of plastic material is provided with a ball lock which is mechanically connected75759595

The control element of the switch with a fixed cylinder of the drive is made in the form of radial holes evenly spaced around the cylinder, in which steel balls are installed, the control element of the switch being made with an annular groove, brought into contact with the indicated balls in the actuator's on position.

FIG. 1 shows a longitudinal section of the actuator in the initial state; in fig. 2 is a longitudinal section of the actuator after its operation.

The drive includes a cylinder 1, in which the piston 2 moves progressively with the control rod 3. The end of the rod is made in the form of a boss 4 and can pass through a hole in the end wall of the cylinder 1, which has a damper 5 made of plastic material. A squib 6 is fixed coaxially with the piston 2 in the opposite wall of cylinder 1. In order to avoid gas leaking from the working chamber of the cylinder, a sealing gasket 7 is installed in the junction of the cartridge with the cylinder. In the end wall of the cylinder, through the hole of which the boss 4 of the control rod 3 passes, there are several radial holes evenly spaced around with balls 8 installed in them. At the entrance of the cylinder 1 there is a charge 9 of explosive.

In the initial state of the actuator (see Fig. Ί), the piston 2 with the control rod 3 is in the leftmost position, rests on the gasket 7 and is screwed by the screw 10. In this case, the boss 4 of the rod 3 blocks the radial holes in the balls 8, which, partially protruding from the holes, enter into the annular groove with the control element of the switch 11 and connect it to the cylinder 1.

When an electric pulse is applied to the contacts of the squib 6, its charge 9 ignites. The gases that are generated during the combustion of the charge push the piston 2, which, cutting off the end of the screw 10, moves

stock 3 right. The boss 4 of the rod emerges from the hole in the end wall of cylinder 1 and opens the holes in, freeing the balls 8. Upon further movement of the piston 2, the rod 3 begins to move the control element of the switch 11. In this case, the released balls 8 are pressed into the cylinder 1, separating it by the control element of the switch 11 At the end of the stroke of the piston 2, it hits the damper 5. In this case, the kinetic energy of the piston 2 is converted into the potential energy of the deformation of the material of the damper 5 (see Fig. 2).

In the initial state, the actuator design ensures reliable fixation of the control element of the switch and does not allow it to move other than by applying an electrical pulse to the contacts of the squib.

Claims (1)

Claim An electric switch actuator containing a stationary cylinder with a pyro cartridge fixed in its end wall, a piston moving in a cylinder with a pushing rod, a control element of the switch and a kinetic energy damper made of plastic material, characterized in that; in order to increase the reliability of the drive by eliminating the possibility of involuntary movement of the control element of the switch, it is equipped with a ball lock that mechanically connects the control element of the switch to the fixed cylinder of the drive and is made in the form of radial holes evenly spaced around the cylinder, in which steel balls are installed, and the control the switch element is made with an annular groove, brought into contact with the indicated balls in the on position drive.