JPS58578B2 - rocket igniter circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates in particular to an igniter circuit for a rocket using an end-burning solid propellant.

Ignition power sources for igniting rocket igniters are generally divided into ground power sources and onboard power sources mounted on the rocket.

In the case of rockets that are launched directly from the ground, ground power is generally used, and there are no problems because the lead wire is led from the nozzle hole to the igniter inside the rocket motor, or from the connector on the outer wall of the rocket to the igniter. do not have.

In the case of a second-stage rocket or an air launch (for example, when it is launched from an airplane or when the initial velocity is given by the propulsion of the launch motor from the ground and it is launched in the air), it is powered from the onboard power source (battery) mounted on the rocket. The command signal requires the igniter to ignite.

In this case, as shown in Figure 1, the rocket motor's propellant 6
In the case of an internal combustion type with a hollow center, the igniter 9 is usually located at the head of the rocket motor, so the power source E
Since the and igniter 9 are directly connected by a lead wire, there is no problem in disposing of the ignition lead wire.

However, in the case of an end-burning type rocket motor, the igniter is located at the tail, that is, on the nozzle side, and the space between the head and tail is filled with propellant, so the ignition lead wire is connected from the rocket head. In order to guide this to the nozzle side, it must be wired outside the rocket motor.

The easiest way to do this is to place lead wires on the outer wall of the rocket motor and cover them with a cable duct (see Figure 2).

However, if there is a cable duct on the outer wall of the rocket, it has the disadvantage of increased air resistance, and it also makes it difficult to launch from the launch tube (the cylindrical object that holds the entire rocket).

By the way, US Pat. No. 3,199,453 discloses a signaling device for submarines.

For this signal device, use a smoke agent (pyrotechni).
A power source and an ignition ball (5quib) are placed in front and behind the composition), and the wiring between the power source and the ignition ball is passed through a cylindrical insulator embedded in the smoke generating agent.

When this structure is used in a rocket motor, a large volume is occupied by the wiring and the insulator, resulting in a problem that the propellant filling rate is reduced.

On the other hand, recently, one to several wires, such as silver wires, are embedded in the front and back directions of the end-burning propellant, and by conducting combustion heat into the propellant through the wire, a recess surrounding the wire is formed on the combustion end face. Attempts have been made to increase the burning area with gradual formation.

The present invention provides that these wires are fortunately electrically insulated by the propellant and are thermally conductive, and therefore generally electrically conductive, and that these wires are Noting that the wires had not suffered any burnout and had good insulation, two or two sets of these wires were used as part of the electrical circuit to the igniter, thereby eliminating the need for external wiring. It is an attempt to construct a rocket that does not exist.

The present invention will be explained in detail by way of examples.

FIG. 3 shows an embodiment using multiple nozzles.

Reference numeral 1 denotes a motor case, to which a front head plate 2 having a hole 2a in the center is screwed to its front end, and a tail head plate 4 having, for example, four nozzles 3 to its rear end.

A liner 5 is attached to the inside of the motor case 1, and a propellant 6 coated with an IJ cylinder 1 is loaded therein.

A suitable number of wires are buried in the propellant 6 parallel to the motor case for the purpose of forming the four parts described above, and two wires 8 and 8' are selected from among them and their ends 8A and 8A are buried.
', 8B, and 8B' are made to protrude from the propellant 6.

The igniter 9 is fixed to the tail mirror plate 4 with screws or the like.

The lead wires io, io' of the electric igniter of the igniter 9 pulled out from the outlet 9a connect one end to the end 8 of the wire 8, 8'.
The other ends of the lead wires 11 and 11' soldered to B and 8B' are respectively connected by a normal connection method.

The other ends 8A, 8A' of the wires 8, 8' are each lead wire 12,
12', and the other ends of the lead wires 12, 12' are connected to the lead wires 14, 14' of the connector 13, respectively, by a normal connection method.

The connector 13 is fixed to the hole 2a of the front end plate 2 with a cap nut 11.

Reference numeral 15 is connected to an onboard power source (not shown) via a lead wire.

16 is a filler filled between the front end plate 2 and the propellant.

The embodiment of FIG. 3 is manufactured as follows.

Both ends 8A, 8A' and 8B of wires 8, 8'.

Pre-coated lead wires 12, 12' and 11, 11' are soldered to 8B', and these wires 8, 8' are placed in a mold together with other wires, and the propellant slurry is poured into the mold. and solidify.

Thereafter, restrictive toughs are attached to the side and front end faces and inserted into the motor case 1.

Connect the lead wires 14 and 14' of the igniter connector 13 to the hole 2a without assembling the front head plate 2 to the motor case 1.
The lead wires 12 and 12' are connected to each other, and insulation treatment is performed.

Naturally, the lead wires 12, 12' must be made a little longer.

After that, when assembling the front mirror plate 2 to the motor case 1, a filler 16 is poured into the front space through the hole 2a.

The filler 16 is usually made of epoxy or the like, and the connector 3 is inserted before the filler solidifies, and the cap nut 1 is inserted.
Tighten and secure.

By following the above process order, the lead wire 14°14'
Also, there is no problem that the parts 12 and 12' are twisted when the front head plate 2 is assembled.

On the other hand, the lead wires 11, 11' and the lead wire i of the igniter 9
For connection to o, i o', attach the igniter 9 to the tail mirror plate 4, and then connect its lead wires 10 and 10' to the nozzle 3.
After pulling out the tail mirror plate 4 and screwing it onto the motor case 1, the lead wires 11 and 11' are brought out from the nozzle 3 and connected, and after insulation treatment is performed thereon, the lead wires 11 and 11' are pushed into the motor.

To ignite such a rocket motor, when the lead wire 15 and a power source (not shown) are connected by a predetermined signal, the igniter 9 connects the lead wire 15, the connector 13, and the lead wire 1.
4, 14', 12, 12', wires 8, 8', lead wires 11, 11', and lead wires 10, 10' to connect to a power source and ignite.

Although the present embodiment has been described in the case of a multi-nozzle, it is clear that the same operation can be performed in the case of a single nozzle.

As described above, the present invention allows igniter wiring to be carried out inside the rocket even in an end-burning type rocket, thereby solving the above-mentioned problems.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of a conventional example, respectively, and FIG. 3 is a sectional view of a main part of an embodiment of the present invention. 3... Nozzle, 6... Propellant, 8... Wire, 9
...Igniter, 13...Connector, 16...Filler.゛shi

Claims (1)

[Claims] 1 In a rocket constructed by penetrating a wire for transmitting combustion heat into the propellant in the longitudinal direction of the end-burning propellant, the electric igniter of the igniter on the tail side and the power source on the front side A rocket igniter electrical circuit, characterized in that the and is connected via the wire.