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Патент USA US3048979

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Aug. 14, 1962
Filed Oct. 24, 1958
ilnited grates Patent U "m
Patented Aug‘. 14, 1962
at the end opposite to the end having beveled surfaces 16.
Rupture diaphragms 21 are provided in the hollow in
serts to seal the openings until the motor is ignited, where
Stephen H. Herzog, China Lake, Cali?, assignor to the
United States of America as represented by the Secre
tary of the Navy
Filed Oct. 24, 1958, Ser. No. 769,517
3 Claims. (Cl. 60—35.6)
(Granted under Title 35, US. Code (1952), see. 266)
upon they are ruptured.
Plate 11, its skirt portion 14, and raised center portion
13 are conventional and made of steel.
The inserts 17 are highly resistant to erosion and are
made of graphite, a refractory metal, or certain metal
oxides, all well known for their resistance to erosion.
The invention described herein may be manufactured
The disk 15 is made of a thermosetting resin, preferably
and used by or for the Government of the United States
a phenolformaldehyde resin which incorporates up to 70%
of America for governmental purposes ‘without the pay
of a ?ller. The ?ller is preferably chopped glass or as
ment of any royalties thereon or therefor.
bestos though other materials could be used. The pre
This invention relates to rocket motors; more speci?cal
ferred resin is one having a low degree of polymerization.
15 The ?ller may be glass, asbestos ?bers or metal particles
ly, it relates to improvements in vdischarge nozzles.
Steel discharge nozzles for rockets have been used suc
and ?laments, though asbestos or glass ?bers are pre
cessfully in the past. The use of higher energy propel
lants, however, brought about the use of erosion-resistant
In practice, the steel plate 11 is ?rst machined; the
inserts in the constricted part of the nozzle where the
plastic portion is made separately and press ?tted into
erosion is greatest. Some of the present propellants are
so energetic that the steel around the insert erodes away
during operation of the motor, allowing the insert to be
expelled from its seat.
Further, the steel nozzles used in the past have been
The plastic disk 15 is made by positioning the erosion
resistant inserts in a suitable mold, pouring in the resin
to which the ?ller has been added and blended, and heat
treating the mold to cure the resin. The rupture dia
fairly heavy of necessity, due to the rather substantial con
phragm is thus molded in place in this operation. Alter
struction required.
natively, the steel plate 11 and integral skirt 14 may be
It is therefore an object of this invention to provide a
used as part of the mold and the disk 15, the inserts 17
nozzle having an erosive-resistant insert which will not be
and blowout diaphragms 21 molded in place.
expelled ‘during operation of the motor.
In assembling a rocket motor incorporating the nozzle
A further object is to provide a nozzle which is con~ 30 assembly of this invention, the combustion chamber is
siderably lighter than existing steel ones, while having a
?rst loaded with propellant and ignition means, and the
nozzle insert which will not be expelled during operation
nozzle plate assembly is screwed into position at the end
of the motor.
of the combustion chamber.
With these and other objects in view, as will hereinafter
A number ‘of the instant nozzle plate assemblies have
more fully appear, and which will be more particularly
been tested under the same conditions that caused con
pointed out in the appended claims, reference is now made
ventional steel nozzle plates to expel their erosion-resistant
to the following description taken in connection with the
inserts and no such expulsion was observed.
accompanying drawings in which:
What is claimed is:
FIG. 1 shows a plan view of the nozzle plate assembly;
1. An erosion resistant nozzle plate assembly compris
FIG. 2 shows an elevational crom-sectional view taken
ing a metal plate having an annular skirt portion on one
along line 2—-2. of FIG. 1, and
side thereof and at least one ‘discharge port therein, the
FIG. 3 shows a cross-sectional plan view taken along
walls of each discharge port increasing gradually in diame
line 3—3 of FIG. 2.
ter from the side of said plate having the annular skirt
Referring now to the ?gures, wherein like reference 45 portion to the opposite side of said plate, a disk of heat
characters designate like or corresponding parts through
resistant plastic material having a diameter equal to the
out the several views, there is shown a nozzle plate 11
inner diameter of said plate skirt portion ?tting within
having a plurality of exit ports as shown, each port having
said skirt portion and in contact with said plate, said disk
a beveled surface 12. The plate 11 has a raised center
having a number of discharge ports therein equal to said
portion 13 on the side opposite to the side shown in FIG. 50 at least one port in said plate and in alignment therewith,
1 which is provided with a threaded hole extending through
the walls of each discharge port in said disk increasing
the raised portion and plate; plate 11 is further provided
gradually in diameter from a smallest diameter at a point
with a circumferential skirt portion 14 made integral there
intermediate the two faces of said disk to the outer face
with. A disk 15 is positioned inside the skirt portion in
thereof, the largest ‘diameter of each discharge port in
contact therewith and is provided with a plurality of exit 55 said ‘disk at the face thereof which contacts said plate
ports corresponding to and in alignment ‘with the ports
being equal in diameter to the smallest diameter of said
in plate 11, the ports of disk 15 having beveled surfaces
at least one discharge port in said plate, a tubular nozzle
16 so as to form a smooth continuous surface with the
insert of erosion-resistant material imbedded in said disk
beveled surfaces 12 of plate 11. Disk 15 is provided with
port Walls at said intermediate point being completely sep
a well, as shown, to receive the raised portion 13 of plate
arated from said plate by the material of said disk and
v11 and to remain in contact therewith. A threaded hole
extends from the bottom of said Well to the other side
of disk 15.
Tubular inserts 17 are provided in the ports of disk 15,
said inserts having beveled surfaces 18 which form a ’
smooth continuous surface with the beveled surfaces 12
and 16 of plate 11 and disk 15, respectively. Inserts 17 are
also provided ‘with inner beveled surfaces at the end op
posite to the end having beveled surfaces 18. The parts
of disk 15 are further provided with beveled surfaces 19 70
having walls coinciding with said disk port walls, whereby
a converging-diverging nozzle having smooth surfaces is
formed by the beveled surfaces of the aforementioned
parts and a heat barrier is formed between the nozzle
surfaces and said metal skirt.
2. The device of claim 1 wherein the disk portion is
made of a phenol-formaldehyde resin incorporating from
about zero to about 70% of a ?ller selected from the
class consisting of asbestos and glass and said insert is
made of graphite.
3. A nozzle plate assembly for rocket motors compris
ing a steel plate having a circumferential steel skirt and
a plurality of exit ports therein each of which has a beveled
‘surface, a heat-resistant rosin disk positioned within said
skirt, said ‘disk having a plurality of exit openings in
alignment with the exit ports of the steel plate and each
opening being provided with a beveled surface, and a
tubular erosion-resistant insert embedded Within the Walls
of each of the exit openings of said disk, each insert being
insulated from said steel plate by the resin of said disk and 10
having a beveled surface, and the beveled ‘surface of
References Cited in the file of this patent
Sanders ______________ __ Nov. 1, 1960
Hughes et a1 ___________ __ Jan. 24, 1961
Nicholson ____________ __ June 13, 19611
each exit opening of said disk merging with the beveled
surfaces of its associated insert and exit port to provide a
smooth continuous surface.
Gillot ________________ __ July 24,
Ward ________________ __ May 20,
Lowe ________________ __ Sept. 2,
Loedding ______________ __ June 7,
France _______________ __ Apr. 23, 1957
Great Britain __________ __ Sept. 26, 1956
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