CN-121976895-A - Rocket engine turbine pump double floating ring blowing sealing structure adopting wear-resistant graphite

CN121976895ACN 121976895 ACN121976895 ACN 121976895ACN-121976895-A

Abstract

The invention discloses a double floating ring blowing sealing structure of a rocket engine turbine pump by adopting wear-resistant graphite, and relates to the technical field of rocket engines. The double floating ring blowing seal comprises a double floating ring blowing seal shell, a floating ring cover plate, a floating ring screw, floating ring graphite, a floating ring sealing gasket, a sealing O-shaped ring and a floating ring shaft sleeve. The double floating ring blowing seal shell comprises a double floating ring blowing seal shell body, an annular seal groove, a threaded hole and an O-shaped ring groove. The floating ring cover plate comprises a floating ring cover plate body and a screw through hole. The floating ring graphite is high-strength high-density wear-resistant graphite and can bear high-speed rotation collision impact. According to the double floating ring blowing sealing structure of the rocket engine turbine pump adopting wear-resistant graphite, the high-strength high-density wear-resistant graphite is adopted, so that the structure of the double floating ring blowing sealing structure is simplified, the design and assembly complexity of the double floating ring blowing sealing structure are reduced, and the working reliability of the turbine pump under the use condition of high-speed rotation working conditions is improved.

Inventors

DU CHANGHE
WANG FENGMEI
WU GUANYING
SHUAI YONG
HE YONG

Assignees

北京往返九霄航空航天科技有限公司
哈尔滨工业大学

Dates

Publication Date: 20260505
Application Date: 20260319

Claims (9)

1. The double floating ring blowing sealing structure of the rocket engine turbine pump adopting wear-resistant graphite is characterized by comprising a double floating ring blowing sealing shell, a floating ring cover plate, floating ring screws, floating ring graphite, a floating ring sealing gasket, a sealing O-shaped ring and a floating ring shaft sleeve; The double floating ring blowing seal shell comprises a double floating ring blowing seal shell body, an annular seal groove, threaded holes and O-shaped ring grooves, wherein the threaded holes are uniformly distributed along the circumferential direction; The floating ring cover plate comprises a floating ring cover plate body and screw through holes, wherein the screw through holes are uniformly distributed along the circumferential direction and keep the center distance consistent with the threaded holes; the floating ring graphite is high-strength high-density wear-resistant graphite and can bear high-speed rotation collision impact.
2. The double floating ring blowing sealing structure of the rocket engine turbine pump adopting wear-resistant graphite according to claim 1, wherein the double floating ring blowing sealing shell is provided with radial annular grooves and radial air inlets, and the number of the radial air inlets is 2 or more than 2 and is uniformly distributed along the circumferential direction.
3. The double floating ring blowing seal structure of the rocket engine turbine pump adopting wear-resistant graphite according to claim 1, wherein the double floating ring blowing seal shell is provided with an anti-rotation boss, and the double floating ring blowing seal shell can be circumferentially limited.
4. The double floating ring blowing seal structure of rocket engine turbine pump adopting wear-resistant graphite according to claim 1, wherein the number of floating ring cover plates is 2, and the floating ring cover plates are provided with jackscrew threaded holes for jackscrew disassembly in the stage of dismounting the double floating ring blowing seal structure.
5. The double floating ring blowing sealing structure of the rocket engine turbine pump adopting wear-resistant graphite according to claim 1, wherein the floating ring screw is of a countersunk screw structure, and occupies little physical space after being installed.
6. The double floating ring blowing-off sealing structure of the rocket engine turbine pump adopting wear-resistant graphite according to claim 1, wherein the floating ring graphite is in radial small clearance fit with the floating ring shaft sleeve, so that the effects of controlling the blowing-off air flow and reducing the blowing-off air pressure are achieved.
7. The double floating ring blowing sealing structure of rocket engine turbine pump adopting wear-resistant graphite as claimed in claim 1, wherein the sealing O-ring is made of low temperature resistant rubber material and can be used in low temperature engine environment.
8. The double floating ring blowing sealing structure of rocket engine turbine pump with wear-resistant graphite according to claim 1, wherein the inner diameter of the floating ring shaft sleeve is designed as a middle gap so as to reduce the axial matching length of the floating ring shaft sleeve and the main shaft of the turbine pump.
9. The double floating ring blowing sealing structure of the rocket engine turbine pump adopting wear-resistant graphite according to claim 1, wherein the floating ring cover plate and the floating ring shaft sleeve are made of hard alloy, so that wear resistance is enhanced.

Description

Rocket engine turbine pump double floating ring blowing sealing structure adopting wear-resistant graphite Technical Field The invention relates to the technical field of liquid rocket engines, in particular to a double floating ring blowing sealing structure of a rocket engine turbine pump adopting wear-resistant graphite. Background The turbopump is a key component of a propellant supply system of the liquid rocket engine, and the propellant enters a thrust chamber for high-pressure combustion after being pressurized by the turbopump. Modern liquid rocket engine turbopumps rotate at speeds up to tens of thousands to hundreds of thousands of revolutions per minute, which puts stringent demands on reliable sealing of the turbopump stator and rotor systems. The turbine pump design usually adopts mechanical seal to seal propellant, and the propellant pressure is showing to reduce after mechanical seal sound friction pair to keep the trace to reveal in order to lubricate friction pair, lengthen mechanical seal working life, the propellant of revealing must carry out reliable isolation in order to prevent the explosion or explosion risk of touching each other. Currently, a floating ring is used for blowing off a sealing structure to isolate leakage propellant, and the structure generally adopts an anti-rotation metal ring to circumferentially limit friction graphite so as to reduce the vibration crushing risk of the friction graphite, but the design and assembly complexity of the floating ring for blowing off the sealing structure are increased. Meanwhile, the floating ring blowing sealing structure lacks of an integral anti-rotation design, so that the working reliability of the turbine pump under the working condition of high-speed rotation is reduced. Disclosure of Invention The invention aims to solve the defects in the prior art, and provides a double floating ring blowing sealing structure of a rocket engine turbine pump by adopting wear-resistant graphite, which further simplifies the floating ring blowing sealing structure of the rocket engine turbine pump and improves the working reliability of the floating ring blowing sealing structure of the turbine pump. The technical scheme adopted for solving the technical problems is as follows: A double floating ring blowing seal structure of a rocket engine turbine pump adopting wear-resistant graphite comprises a double floating ring blowing seal shell, a floating ring cover plate, floating ring screws, floating ring graphite, a floating ring sealing gasket, a sealing O-shaped ring and a floating ring shaft sleeve. The double floating ring blowing seal shell comprises a double floating ring blowing seal shell body, an annular seal groove, a threaded hole and an O-shaped ring groove. The threaded holes are uniformly distributed along the circumferential direction. The floating ring cover plate comprises a floating ring cover plate body and screw through holes. The screw through holes are uniformly distributed along the circumferential direction and keep the center distance consistent with the threaded holes. The floating ring graphite is high-strength high-density wear-resistant graphite and can bear high-speed rotation collision impact. Preferably, the double floating ring blowing seal shell is provided with a radial annular groove and a radial air inlet hole. The number of the radial air inlets is 2 or more than 2, and the radial air inlets are uniformly distributed along the circumferential direction. Preferably, the double floating ring blowing seal housing is provided with an anti-rotation boss, and the double floating ring blowing seal housing can be circumferentially limited. Preferably, the number of the floating ring cover plates is 2, and the floating ring cover plates are provided with jackscrew threaded holes for jackscrew disassembly in the double floating ring blowing sealing structure disassembly stage. Preferably, the floating ring screw has a countersunk head screw structure, and occupies little physical space after being installed. Preferably, the floating ring graphite is in radial small clearance fit with the floating ring shaft sleeve, so that the effects of controlling the blowing air flow and reducing the blowing air pressure are achieved. Preferably, the sealing O-ring is made of low-temperature resistant rubber material and can be used in a low-temperature engine environment. Preferably, the inner diameter of the floating ring shaft sleeve is designed as a middle gap so as to reduce the axial matching length of the floating ring shaft sleeve and the main shaft of the turbine pump. Preferably, the floating ring cover plate and the floating ring shaft sleeve are made of hard alloy, so that the wear resistance is enhanced. Compared with the prior art, the invention has the following advantages: (1) In the double floating ring blowing sealing structure of the rocket engine turbine pump, the floating ring graphite is high-strength high-dens