Metal working – Method of mechanical manufacture – Rocket or jet device making
Reexamination Certificate
1999-10-01
2001-11-27
Cuda-Rosenbaum, I (Department: 3726)
Metal working
Method of mechanical manufacture
Rocket or jet device making
C029S469000
Reexamination Certificate
active
06321450
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to the field of power machine building and is concerned with the production of gas generators for liquid-propellant rocket engines.
BACKGROUND OF THE INVENTION
Different methods for producing gas generators for liquid-propellant rocket engines (LRE) are known from prior art. The construction of a gas generator is disclosed in U.S. Pat. No. 3,147,592, NPC
60-39.46, 1964
, in which a cover together with a feed branch pipe is welded to a mixing head. Injectors are mounted in the head. The mixing head is secured to a casing using a threaded joint. The casing is made as a single unit with a chamber and fire branch pipe.
A disadvantage of this method is that it does not ensure reliability of an assembly for high-thrust liquid propellant rocket engines.
The technical solution most similar to the present invention is a method for producing a gas generator of welded-brazed construction for a liquid-propellant rocket engine, comprising the steps of assembling, brazing and welding a mixing head, having a cover with a branch pipe for supplying one of the propellant components, and injectors rigidly connected to the cover, and a bottom and a main line for supplying another component, the step of producing a casing with an outlet branch pipe, and subsequent steps of welding the casing to the mixing head (see, e.g. I. I. Gorev “Basics of Producing Liquid-Propellant Rocket Engines,” Moscow, 1969, pp. 10-12).
A disadvantage of this technical solution is insufficient reliability of the welded and brazed joints, which do not ensure higher strength and operation properties of gas generators, especially at high operation pressures, for example, 600 atmospheres, and at a relatively high thermal factor of the assembly.
SUMMARY OF THE INVENTION
The object of the present invention is to improve the technological aspects of the method for producing the construction and to improve the strength and operating characteristics by ensuring high quality of the welded and brazed joints.
The technical result from realization of the invention is that when there is improvement of the technological aspects of production, the reliability of the assembly is enhanced due to the obtained high quality in the constructions of the welded and brazed joints. Due to this it was possible to create an oxidizing gas generator for high-thrust liquid-propellant rocket engines. The essence of the invention is that in a method for producing a welded-brazed construction of an LRE gas generator comprising the steps of producing a mixing head provided with a branch pipe for supplying a first propellant component, a pipeline for supplying a second propellant component, a casing, and an outlet branch pipe, and subsequently joining them to each other by welding, a double-layer spacer, consisting of an outer structural envelope and a fire wall having ribs on its outer side, and a connecting split ring are additionally produced, the outlet branch pipe is made double-layer consisting of an outer structural envelope and a fire wall having ribs on its outer side, the casing is made in the form of a spherical envelope having three holes, two of which are made coaxial from different sides in walls of the spherical envelope and serve for connection to the mixing head and the outlet branch pipe respectively, and the third hole serves for connection to a main line for supplying the second propellant component, before fastening the casing, the mixing head and the outlet branch pipe, the outer structural envelopes and the fire walls respectively of the double-layer spacer and outlet branch pipe are preliminarily joined to each other by brazing, wherein prior to brazing a high-temperature solder is applied to the inner surfaces of the structural envelopes and to the outer surfaces of the fire walls, brazing is carried out at a temperature of 960-980° C. with the end faces of the fire walls stopped against each other with the provision of an axial slot between the structural envelopes, then welding the end faces of the double-layer spacer fire wall and the outlet branch pipe fire wall is effected by electron-beam welding, wherein an electron beam is directed into the slot between the structural envelopes, then the double-layer spacer structural envelope and the outlet branch pipe structural envelope are welded to each other using a connecting split ring by argon-arc welding, then the double-layer spacer is welded to the mixing head by argon-arc gas-shielded welding, then the interjoined mixing head, double-layer spacer and outlet branch pipe are placed in the casing to which the main line for supplying the second propellant component is preliminarily welded, and the casing is welded to the mixing head and the outlet branch pipe.
Joining the casino to the mixing head and joining the branch pipe for supplying the first propellant component to the mixing head is carried out by argon-arc gas-shielded welding, additional beads being made along the weld seam.
Furthermore, a ring backing plate is made and welding the casing to the outlet branch pipe is effected on the made backing plate which is preliminarily attached to the outlet branch pipe, and additional beads are made along the made weld seam boundary.
Welding the casing to the branch pipe for supplying the second propellant component is done by argon-arc welding on a removable copper backing plate, which is placed on the inner side of the weld root, and additional beads are made along the made weld seam boundary.
REFERENCES:
patent: 3147592 (1964-09-01), Rose et al.
patent: 3768256 (1973-10-01), Butter et al.
patent: 4825531 (1989-05-01), Nold
patent: 5199155 (1993-04-01), Cord et al.
patent: 5407120 (1995-04-01), Philpot
patent: 5501011 (1996-03-01), Pellet
Bogushev Vladimir Jurievich
Chvanov Vladimir Konstantinovich
Derkach Gennady Grigorievich
Dudkin Nikolai Kondratievich
Grigorkin Nikolai Mikhailovich
Blakely & Sokoloff, Taylor & Zafman
Cuda-Rosenbaum I
Otkrytoe Aktsionernoe Obschestvo Nauchnoproizvodstvennoe Obiedin
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