CN-115898701-B - Combined self-tightening sealing structure for head of thrust chamber

CN115898701BCN 115898701 BCN115898701 BCN 115898701BCN-115898701-B

Abstract

The invention relates to the technical field of rocket engine test devices, in particular to a combined self-tightening sealing structure for a thrust chamber head, which is used for sealing the head of the thrust chamber in a test, and comprises a first sealing component, a second sealing component and a third sealing component, wherein the first sealing component and the second sealing component form annular sealing surfaces at the head of the thrust chamber, the sealing surfaces of the first sealing component, the second sealing component and the third sealing component are sequentially arranged from outside to inside and jointly seal the head of the thrust chamber, the first sealing component transmits test load force to a thrust chamber head flange, the second sealing component transmits the test load force to the back of the thrust chamber head flange, the third sealing component transmits the test load force to a test device base, and high-pressure loads in the test process are respectively acted on the first sealing component, the second sealing component and the third sealing component, so that the safety coefficient of each sealing component is improved, and the stress level of the sealing component under a high-pressure test working condition is reduced.

Inventors

DU JIANG
XU TONGYE
DUAN LILI
HU MIN
FAN WENQIANG
WU ZHENZHONG
ZHAO JINGJUN

Assignees

西安航天发动机有限公司

Dates

Publication Date: 20260508
Application Date: 20221028

Claims (7)

1. A combined self-tightening sealing structure for a thrust chamber head is used for sealing the head of a thrust chamber (24) in a test and is characterized by comprising a first sealing assembly, a second sealing assembly and a third sealing assembly; the first sealing component and the second sealing component form annular sealing surfaces at the head part of the thrust chamber (24), and the sealing surfaces of the first sealing component, the second sealing component and the third sealing component are sequentially arranged from outside to inside and jointly seal the head part of the thrust chamber (24); the first seal assembly transmits test load force to the thrust chamber head flange (26), the second seal assembly transmits test load force to the back of the thrust chamber head flange (26), and the third seal assembly transmits test load force to the test device base; the first sealing assembly comprises an end face sealing flange (3), a first connecting piece (13), a first rubber ring (17) and a first check ring (18); The end face sealing flange (3) is of an annular structure and is detachably connected with the thrust chamber head flange (26) into a whole through the first connecting piece (13); The end face of the end face sealing flange (3) attached to the thrust chamber head flange (26) is provided with a first sealing groove which is annular and extends in the whole circumferential direction of the end face sealing flange (3), and a first rubber ring (17) and a first check ring (18) are arranged in the first sealing groove; The second sealing assembly comprises a sealing flange (4) and a first sliding block (5); The first sliding block (5) is of an annular structure and is positioned at the inner side of the end face sealing flange (3), an annular outer sealing cavity is formed between the first sliding block (5) and the inner side face of the end face sealing flange (3), a first sealing ring extending into the outer sealing cavity is arranged on the outer side face of the first sliding block (5), and the first sealing ring is positioned at one end, close to the thrust chamber (24), of the outer sealing cavity; the sealing flange (4) is positioned at one side of the end face sealing flange (3) away from the thrust chamber head flange (26), the sealing flange (4) is of an annular structure, the lower end of the sealing flange extends into the outer sealing cavity and is propped against the first sealing ring assembly, a first positioning step (27) is arranged on the outer side face of the lower end of the sealing flange (4), and the first positioning step (27) is propped against the end face of the end face sealing flange (3) and is attached to and positioned with the inner side face of the end face sealing flange (3); The first sliding block (5) is detachably and fixedly connected with the sealing flange (4) into a whole, and the sealing flange (4) is detachably connected with the thrust chamber head flange (26) into a whole through a first connecting component; the third sealing assembly comprises a second sliding block (6) and a gland (9); The second sliding block (6) is positioned at the inner side of the first sliding block (5), an annular inner sealing cavity is formed between the outer side surface of the second sliding block (6) and the inner side surface of the first sliding block (5), a second sealing ring (38) extending into the inner sealing cavity is arranged at the outer side surface of the second sliding block (6), and the second sealing ring (38) is positioned at one end, close to the thrust chamber (24), of the inner sealing cavity; The gland (9) is positioned at the inner side of the sealing flange (4), the outer side surface of the gland (9) is provided with a third positioning step (34), the gland (9) is propped against the end surface of the sealing flange (4) through the third positioning step (34) and is matched and positioned with the inner side surface of the sealing flange (4), one end of the gland (9) facing the second sliding block (6) is provided with an annular second positioning step (28), and the second positioning step (28) stretches into the inner sealing cavity and is propped against the second sealing ring component; The second sliding block (6) is fixedly connected with the gland (9) into a whole in a detachable way, and the gland (9) is fixedly connected with the base of the test device in a detachable way through a second connecting component.
2. A combined self-tightening sealing structure for a thrust chamber head according to claim 1, wherein the first connecting piece (13) is a bolt, and is connected with a threaded hole of a thrust chamber head flange (26) after passing through a through hole of the end face sealing flange (3).
3. The self-tightening sealing structure for the head of a thrust chamber according to claim 1, wherein the first connecting assembly comprises a fixed flange (1), an adapter seat (2) and a second connecting piece (14); the fixed flange (1) is of an annular structure, and the minimum inner diameter of the fixed flange is larger than the outer diameter of the thrust chamber head flange (26); the adapter seat (2) is an arc-shaped plate, and the corresponding central angle of the arc-shaped plate is smaller than or equal to 180 degrees, and the inner surface of the adapter seat (2) is matched with the outer side surface and the lower side surface of the thrust chamber head flange (26); the adapter (2) is arranged between the thrust chamber head flange (26) and the fixed flange (1), and the fixed flange (1) and the sealing flange (4) are detachably and fixedly connected into a whole through the second connecting piece (14).
4. The self-tightening combined sealing structure for the head of the thrust chamber according to claim 1, wherein the first sealing ring assembly comprises two second rubber rings (19), a second check ring (20) is arranged between the two second rubber rings (19), and the second check ring (20) is annular.
5. The combined self-tightening sealing structure for the head of the thrust chamber according to claim 1, wherein the second sealing ring assembly comprises two third rubber rings (21), a third check ring (22) is arranged between the two third rubber rings (21), and the third check ring (22) is annular.
6. A combined self-tightening sealing structure for a thrust chamber head as claimed in claim 1, characterized in that the outer diameter of the second sealing ring (38) is adapted to the diameter of the throat of the thrust chamber (24).
7. The combined self-tightening sealing structure for the head of a thrust chamber according to claim 1, wherein the second connecting assembly comprises a fixed seat (10) and a pull rod (11); a plurality of third connecting studs (36) are arranged on the gland (9), connecting holes (30) are formed in positions of the fixing seat (10) corresponding to the third connecting studs (36), and the third connecting studs (36) penetrate through the connecting holes (30) and then are connected with the first nuts (15); The fixing seat (10) is provided with a plurality of supporting angle seats (29), the supporting angle seats (29) are uniformly and alternately distributed in the circumferential direction of the fixing seat (10), one end of the pull rod (11) is connected with the supporting angle seats (29) through a gasket (12) and a third nut (23), and the other end of the pull rod is arranged on the base of the test device.

Description

Combined self-tightening sealing structure for head of thrust chamber Technical Field The invention relates to the technical field of rocket engine test devices, in particular to a combined self-tightening sealing structure for a thrust chamber head. Background The engine thrust chamber is a component for converting propellant energy and generating thrust in the liquid rocket engine, and is a core component of the liquid rocket engine. The development of the thrust chamber not only needs to solve the problems of design, materials, manufacturing process and the like, but also is an important problem to be solved for the strength and air tightness test verification of each part. Therefore, a sealing structure applied to the head of the thrust chamber needs to be designed and developed, and is used in cooperation with a throat sealing assembly of the thrust chamber, a base of a test device, a mounting platform and the like, so as to check the welding quality and the structural static strength of a welding line of the thrust chamber. Disclosure of Invention The invention aims to solve the technical problem of providing a combined self-tightening sealing structure for a thrust chamber head, which is matched with a thrust chamber throat sealing assembly, a test device base, a mounting platform and the like for use in a test of a thrust chamber. In order to solve the technical problems, the technical scheme of the invention is as follows: The combined self-tightening sealing structure for the head of the thrust chamber is used for sealing the head of the thrust chamber in a test and comprises a first sealing assembly, a second sealing assembly and a third sealing assembly; the first sealing component and the second sealing component form annular sealing surfaces at the head part of the thrust chamber, and the sealing surfaces of the first sealing component, the second sealing component and the third sealing component are sequentially arranged from outside to inside to jointly seal the head part of the thrust chamber; the first seal assembly transmits test load force to the thrust chamber head flange, the second seal assembly transmits test load force to the back of the thrust chamber head flange, and the third seal assembly transmits test load force to the test device base. The first sealing component comprises an end face sealing flange, a first connecting piece, a first rubber ring and a first check ring; The end face sealing flange is of an annular structure and is detachably connected with the thrust chamber head flange into a whole through a first connecting piece; The end face of the end face sealing flange, which is attached to the thrust chamber head flange, is provided with a first sealing groove which is annular and extends in the whole circumferential direction of the end face sealing flange, and a first rubber ring and a first check ring are arranged in the first sealing groove. In the above-mentioned combined self-tightening sealing structure for a thrust chamber head, the first connecting piece is a bolt, and passes through a through hole of the end face sealing flange and then is connected with a threaded hole of the thrust chamber head flange. In the above-mentioned combined self-tightening sealing structure for a thrust chamber head, the second sealing component includes a sealing flange and a first slider; the first sliding block is of an annular structure and is positioned at the inner side of the end face sealing flange, an annular outer sealing cavity is formed between the first sliding block and the inner side face of the end face sealing flange, a first sealing ring extending into the outer sealing cavity is arranged on the outer side face of the first sliding block, the first sealing ring is positioned at one end, close to the thrust chamber, of the outer sealing cavity, and the outer side face of the first sealing ring is attached to the inner side face of the end face sealing flange; The sealing flange is positioned at one side of the end face sealing flange, which is far away from the head flange of the thrust chamber, and the sealing flange is of an annular structure, and the lower end of the sealing flange stretches into the outer sealing cavity and is propped against the first sealing ring component; the first sliding block is detachably and fixedly connected with the sealing flange into a whole, and the sealing flange is detachably connected with the thrust chamber head flange into a whole through the first connecting component. In the above-mentioned combined self-tightening sealing structure for a thrust chamber head, the first connecting component includes a fixing flange, an adapter seat and a second connecting piece; the fixed flange is of an annular structure, and the minimum inner diameter of the fixed flange is larger than the outer diameter of the flange at the head of the thrust chamber; The inner profile of the adapter is matched with the shape of the outer side surface an