Bellows units for a chamber of a liquid-propellant rocket engine with afterburning

A bellows unit for a combustion chamber of a liquid-propellant rocket engine with afterburning, said combustion chamber being mounted in a gimbal, comprising:

• a bellows having two end faces and a corrugated envelope positioned at a periphery of said bellows along a longitudinal axis thereof, said bellows adapted to interface with said liquid propellant rocket engine,
• an internal shield of said bellows, said shield having an internal cavity thereof, which cavity is limited by a first envelope of said shield and by a second envelope of said shield, each of said shield envelopes being a body of rotation positioned along said longitudinal axis of said bellows, adjoining end faces of said first and second shield envelopes being telescopically installed one in another with a gap therebetween,
• a bellows cooling chamber positioned between said internal shield and said corrugated envelope, said bellows cooling chamber communicating via said gap to said internal cavity of said shield,
• a first support ring and a second support ring, which are positioned coaxially with said bellows at both end faces thereof and fixed in cantilever to corresponding end faces of said first and said second shield envelopes,
• channels for feeding a cooling working medium, which are made in said rings and are adapted to feed said cooling working medium into said cooling chamber of said bellows,
• wherein an average diameter of said bellows is selected from the following relationship:
• D c ≥ 1.13 ⁢ ⁢ R P , ⁢ where
• Dc is the average diameter of the bellows,
• R is the engine chamber thrust force,
• P is the turbine gas pressure,
• whereby the workability of said bellows unit in a high-temperature, high-pressure gas medium and a reduction of the load on support bearings of said gimbal are ensured.

A bellows unit for a rocking unit of a combustion chamber of a liquid-propellant rocket engine with afterburning, comprising:

• a bellows having two end faces and a corrugated envelope positioned at a periphery of said bellows along a longitudinal axis thereof,
• protective structural rings of said bellows that are positioned in depressions of outer corrugations of said corrugated envelope,
• an internal shield of said bellows, having an internal cavity of said shield, said cavity being limited by a first shield envelope and a second shield envelope, each of said shield envelopes being a body of rotation positioned along said longitudinal axis of said bellows, adjoining end faces of said first and said second shield envelopes being telescopically installed one in another with a gap therebetween,
• a bellows cooling chamber positioned between said internal shield and said corrugated envelope, said bellows cooling chamber communicating via said gap to said internal cavity of said shield,
• a first support ring and a second support ring, which are positioned coaxially with said bellows at both end faces thereof and fixed in cantilever to corresponding end faces of said first and said second shield envelopes,
• channels for feeding a cooling working medium, which are made in said rings and are adapted to feed said cooling working medium into said cooling chamber of said bellows,
• a housing of said bellows, mounted with interference outside said protective structural rings of said bellows and made in the form of a metallic cylindrical helix, ends of which are connected to said support rings, whereby the workability of said bellows unit in a medium of high-temperature, high-pressure gas, enhancement of strength properties of said bellows unit and limitation of spontaneous bending of said bellows unit when said combustion chamber of said engine is turned, are ensured.

A rocking unit of a combustion chamber of a liquid-propellant rocket engine with afterburning, comprising:

• a gas line,
• a combustion chamber having a longitudinal axis and being positioned downstream of said gas line in respect of said gas flow,
• a gimbal supporting said combustion chamber, a bellows unit mounted coaxially with said combustion chamber between it and said gas line, and having a bellows with two end faces and a corrugated envelope positioned at a periphery of said bellows along its longitudinal axis,
• protective structural rings of said bellows, positioned in depressions in said outer corrugations of said corrugated envelope,
• an internal shield of said bellows, having an internal cavity of said shield, said cavity being limited by a first shield envelope and by a second shield envelope, each of said shield envelopes being a body of rotation positioned along said longitudinal axis of said bellows, adjoining end faces of said first and second shield envelopes being telescopically installed one in the other with a gap therebetween,
• a cooling chamber of said bellows, positioned between said internal shield and said corrugated envelope, said cooling chamber of said bellows communicating via said gap with said internal cavity of said shield,
• a first support ring and a second support ring positioned coaxially with said bellows at both end faces thereof and fixed in cantilever to corresponding end faces of said first and second shield envelopes, said first support ring serving to provide a sealed connection between said bellows unit and said gas line, and said second support ring serving to provide a sealed connection between said bellows unit and said combustion chamber,
• channels for feeding a cooling working medium, that are made in said support rings and are adapted to feed said cooling working medium into said cooling chamber of said bellows from a main line for feeding said cooling working medium,
• a housing of said bellows, that is mounted with interference outside said protective structural rings of said bellows and is made in the form of a metallic cylindrical helix, ends of which being connected to said support rings,
• a gimbal ring of said gimbal, that envelops said bellows unit and is hinge connected through structural brackets to said first support ring and to said second support ring, respectively.