JP7627415B2 - Assembled autoclaved seal for thrust chamber head. - Google Patents

Description

The present invention belongs to the technical field of rocket engine test equipment, and in particular to an assembled self-sealing structure for a thrust chamber head.

The engine thrust chamber is the core component of a liquid rocket engine, converting the energy of the propellant to generate thrust. In research into the thrust chamber, not only do we need to solve problems in design, materials, manufacturing processes, etc., but we also need to solve important issues such as the verification of strength and airtightness tests for each component.

Therefore, it is necessary to study the sealing structure used in the thrust chamber head, which is used in combination with the sealing member of the thrust chamber throat, the base of the test equipment, and the mounting platform, etc., to evaluate the welding quality and structural static strength of the welds of the nuclear thrust chamber.

The technical problem that this invention aims to solve is to provide an assembled self-sealing sealing structure for a thrust chamber head that is used in combination with a sealing member for the thrust chamber throat, the base and mounting platform of a test device, and is used for testing the thrust chamber.

To solve the above technical problems, the technical means of the present invention are as follows:

A self-sealing assembly for a thrust chamber head used to seal the head of the thrust chamber during testing, comprising:
a first sealing member, a second sealing member, and a third sealing member;
the first sealing member and the second sealing member each form an annular sealing surface at the head of the thrust chamber, the sealing surfaces of the first sealing member, the second sealing member and the third sealing member are arranged in order from outside to inside, and jointly seal the head of the thrust chamber;
An assembled self-sealing sealing structure for a thrust chamber head, in which a first sealing member transmits a test load force to a thrust chamber head flange, a second sealing member transmits the test load force to a back surface of the thrust chamber head flange, and a third sealing member transmits the test load force to a base seat of a test apparatus.

In the assembled self-sealing structure for the thrust chamber head, the first sealing member includes an end face seal flange, a first link, a first rubber ring, and a first stopper;
the face seal flange is a ring-shaped structure and is detachably connected to the thrust chamber head flange via a first link;
a first seal groove is provided on an end surface of the end face seal flange that is bonded to the thrust chamber head flange, the first seal groove being annular and extending in the entire circumferential direction of the end face seal flange;
A first rubber ring and a first stopper are provided in the first seal groove.

In the assembled self-tightening sealing structure for the thrust chamber head, the first link is a bolt that passes through a through hole in the end face seal flange and is connected to a threaded hole in the thrust chamber head flange.

In the assembled autoclaved sealing structure for the thrust chamber head, the second sealing member includes a seal flange and a first slider;
The first slider has a ring-shaped structure and is located inside the end face seal flange. A ring-shaped outer seal chamber is formed between the first slider and the inner surface of the end face seal flange. A first packing is provided on the outer surface of the first slider and enters the outer seal chamber. The first packing is located at the end of the outer seal chamber close to the thrust chamber and its outer surface is bonded to the inner surface of the end face seal flange. A first seal ring member is provided within the outer seal chamber.
the seal flange is located on the side of the end face seal flange facing away from the thrust chamber head flange, the seal flange has a ring-shaped structure, a lower end of the seal flange enters the outer seal chamber and abuts against the first seal ring member, a first positioning step is provided on the outer surface of the lower end of the seal flange, the first positioning step abuts against the end face of the end face seal flange and is bonded to the inner surface of the end face seal flange for positioning;
The first slider and the seal flange are removably fixedly connected, and the seal flange is removably connected to the thrust chamber head flange via a first connecting member.

In the assembled autoclaved sealing structure for a thrust chamber head, the first connecting member includes a fixed flange, an adapter, and a second link;
the fixed flange is a ring-shaped structure having a minimum inner diameter greater than an outer diameter of the thrust chamber head flange;
The adapter is an arc-shaped plate, and the corresponding central angle is less than or equal to 180°;
The inner mold surface of the adapter matches the shape of the outer and lower surfaces of the thrust chamber head flange;
The adapter is located between the thrust chamber head flange and the fixed flange, and the fixed flange and the seal flange are removably fixedly connected via a second link.

In the assembled self-sealing structure for the thrust chamber head, the first seal ring member includes two second rubber rings, and a ring-shaped second stopper is provided between the two second rubber rings.

In the assembled self-sealing structure for the thrust chamber head, the third sealing member includes a second slider and a pressing lid;
The second slider is located inside the first slider, and a ring-shaped inner seal chamber is formed between the outer surface of the second slider and the inner surface of the first slider. A second packing is provided on the outer surface of the second slider and enters the inner seal chamber. The second packing is located at an end of the inner seal chamber close to the thrust chamber, and its outer surface is bonded to the inner surface of the first slider. A second seal ring member is provided in the inner seal chamber.
the pressing lid is located inside the seal flange, and the outer surface of the pressing lid has a third positioning step, the pressing lid abuts against the end surface of the seal flange via the third positioning step and is joined to the inner surface of the seal flange for positioning, and an annular second positioning step is provided at the end of the pressing lid facing the second slider, and the second positioning step enters the inner seal chamber and abuts against the second seal ring member,
The second slider is removably and fixedly connected to the pressing lid, and the pressing lid is removably and fixedly connected to a base of the testing device via a second connecting member.

In the assembled self-sealing structure for the thrust chamber head, the second seal ring includes two third rubber rings, and a ring-shaped third stopper is provided between the two third rubber rings.

In the assembled self-sealing structure for the thrust chamber head, the outer diameter of the second packing matches the diameter of the throat of the thrust chamber.

In the assembled self-sealing structure for a thrust chamber head, the second connecting member includes a fixed seat and a tie rod;
The pressing cover is provided with a plurality of third connection studs, and connection holes are provided in the fixing seat at positions corresponding to the third connection studs, and the third connection studs pass through the connection holes and are connected to the first nut;
The fixed seat is provided with a plurality of support seats, which are uniformly distributed at intervals around the circumferential direction of the fixed seat, and one end of the tie rod is connected to the support seat via a gasket and a third nut, and the other end is attached to the bottom seat of the test device.

The assembled self-sealing structure for the thrust chamber head has the following advantages:

The high pressure load during the test process is divided into three parts according to the proportion of the area of each sealing member that receives the force, and acts on the first sealing member, the second sealing member, and the third sealing member, respectively. This improves the safety factor of the threads of each sealing member, reduces the stress level of the sealing members under high pressure test conditions, and improves sealing reliability.

In the process of installing the second and third sealing members, there is no interference, i.e., no compression, when the second and third rubber rings are attached to the mating surfaces. After installation is complete, the first and second tightening nuts are tightened, causing the second and third rubber rings to expand and be compressed in the radial direction. The compression is usually set to about 25%. This reduces the difficulty of installation, increases the compression of the rubber rings, and improves the reliability of the sealing structure.

Based on the plate gap flow principle of fluid mechanics, the amount of fluid leakage is inversely proportional to the square of the seal length, so through structural design, the use of two rubber rings for each of the second and third sealing members can effectively improve the reliability of the seal. The metal stopper increases the seal length of the seal groove, and the tightening nut realizes quantitative control of the compression amount of the rubber ring, further improving the reliability of the sealing structure.

In order to more clearly explain the technical means in the embodiments of the present invention or the prior art, the following briefly introduces drawings necessary for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

FIG. 2 is a structural schematic diagram of the assembled self-sealing structure and the thrust chamber head in an assembled state. FIG. 2 is a local enlarged view of region A in FIG. FIG. 4 is a structural schematic diagram of the cross section BB in FIG. 3. FIG. FIG. FIG. 4 is a schematic diagram of the structure of a second slider. FIG. 4 is a schematic diagram of the top structure of a second slider.

Description of symbols: 1 - fixing flange; 2 - adapter; 3 - end face seal flange; 4 - seal flange; 5 - first slider; 6 - second slider; 7 - first tightening nut; 8 - second tightening nut; 9 - pressing cover; 10 - fixing seat; 11 - tie rod; 12 - gasket; 13 - first link; 14 - second link; 15 - first nut; 16 - second nut; 17 - first rubber ring; 18 - second rubber ring; 19 - second rubber ring; 20 - second stopper 3; 21 - third rubber ring; 22 - third stopper; 23 - third nut; 24 - thrust chamber; 25 - first connecting stud; 26 - thrust chamber head flange; 27 - first positioning step; 28 - second positioning step; 29 - support seat; 30 - connecting hole; 31 - first reinforcement; 32 - second reinforcement; 33 - third reinforcement; 34 - third positioning step; 35 - connecting chamber; 36 - third connecting stud; 37 - second connecting stud; 38 - safety factor.

The present invention will be further explained below with reference to examples.

The assembled self-sealing sealing structure for the thrust chamber head is used to seal the head of the thrust chamber 24 during testing. The assembled self-sealing sealing structure includes a first sealing member, a second sealing member, and a third sealing member. The first sealing member forms an annular sealing surface on the head of the thrust chamber 24 and transmits the test load force to the threaded hole of the thrust chamber head flange 26 via the first link 13. The second sealing member forms an annular sealing surface on the head of the thrust chamber 24 and transmits the test load force to the back side of the thrust chamber head flange 26 via the second link 14. The third sealing member transmits the test load force to the bottom seat of the test device via the tie rod 11. The sealing surfaces of the first sealing member, the second sealing member, and the third sealing member are provided in order from the outside to the inside and jointly seal the head of the thrust chamber. The first sealing member, the second sealing member, and the third sealing member are provided at the axial position of the thrust chamber 24 and are not fixedly connected to each other, so that no transmission of axial force occurs. The separate structural design reduces the stress level of each force-receiving component, minimizing the effect of test residual force on the thrust chamber 24.

As shown in Figures 1 and 2, the first sealing member includes an end face seal flange 3, a first link 13, a first rubber ring 17, and a first stopper 18.

The end face seal flange 3 is ring-shaped and has an inner hole, conforming to the shape of the end face of the thrust chamber head flange 26. In use, the end face seal flange 3 and the thrust chamber head flange 26 are detachably connected together via the first link 13. Preferably, the first link 13 is a bolt that passes through a through hole in the end face seal flange 3 and is connected to a threaded hole in the thrust chamber head flange 26.

A first seal groove is provided on the end face of the end face seal flange 3 that is bonded to the thrust chamber head flange 26. The first seal groove is annular and extends in the entire circumferential direction of the end face seal flange 3. As shown in FIG. 2, a first rubber ring 17 and a first stopper 18 are provided in the first seal groove. The first rubber ring 17 is an O-shaped rubber ring. The first stopper 18 is ring-shaped and is fitted into the first seal groove as a whole, which increases the seal length in the leakage passage, improves the reliability of the sealing structure, and reduces the difficulty of assembling the parts.

The second sealing member includes a seal flange 4, a first slider 5, a first connecting member, a first seal ring member, and a first tightening nut 7. The first connecting member is used to detachably connect the seal flange 4 and the thrust chamber head flange 26, and includes a fixed flange 1, an adapter 2, a second link 14, and a second nut 16. The first seal ring member includes two second rubber rings 19 and one second stopper 20.

The first slider 5 is located inside the end face seal flange 3. The outer surface of the first slider 5 is joined to the inner surface of the end face seal flange 3 to achieve sealing. The first slider 5 has a ring-shaped structure and has an inner hole. An annular groove is provided on the side of the first slider 5 facing the thrust chamber 24, which reduces the weight and improves the sealing effect of the first slider 5. An annular outer seal chamber is formed between the first slider 5 and the inner surface of the end face seal flange 3. A first packing is provided on the outer surface of the first slider 5, which enters the outer seal chamber. The first packing is provided in the vicinity of the thrust chamber 24. The outer surface of the first packing is pasted on the inner surface of the end face seal flange 3. A first seal ring member is provided in the outer seal chamber. The first seal ring member includes two second rubber rings 19. A second stopper 20 is provided between the two second rubber rings 19. The second stopper 20 is a complete ring. The second stopper 20 is fitted as a whole into the outer seal chamber. Second rubber rings 19 are provided on the front and rear sides of the second stopper 20, respectively, which increases the seal length in the leakage passage and improves the reliability of the sealing structure.

The seal flange 4 is located on the side of the end face seal flange 3 facing away from the thrust chamber head flange 26. The seal flange 4 has an annular structure and an inner hole, the lower end of which enters the outer seal chamber and abuts against the second rubber ring 19. A first positioning step 27 is provided on the outer surface of the seal flange 4. The first positioning step 27 abuts against the end face of the end face seal flange 3 and is bonded to the inner surface of the end face seal flange 3 to position the seal flange 4. A first connecting stud 25 is welded to the first slider 5, and the first connecting stud 25 is screwed into the first tightening nut 7 to provide a fixed connection between the first slider 5 and the seal flange 4.

The fixed flange 1 has a completely annular structure, and its minimum inner diameter is larger than the outer diameter of the thrust chamber head flange 26. Preferably, the minimum inner diameter of the fixed flange 1 is 0.5 mm-1 mm larger than the outer diameter of the thrust chamber head flange 26. This allows the thrust chamber head flange 26 to pass through the inner hole of the fixed flange 1 when assembling the equipment, so that the fixed flange 1 can reach both sides of the thrust chamber head flange 26. That is, in the state shown in FIG. 1, the fixed flange 1 is located below the thrust chamber head flange 26.

The adapter 2 is an arc-shaped plate with a corresponding central angle of 180° or less. The inner mold surface of the adapter 2 is bonded to the outer surface and the underside of the thrust chamber head flange 26. In use, the adapter 2 is located between the thrust chamber head flange 26 and the fixed flange 1, and the fixed flange 1 and the seal flange 4 are detachably connected via the second link 14. The second link 14 may be a bolt, and when used in combination with the second nut 16, a secure connection between the fixed flange 1 and the seal flange 4 is achieved.

The third sealing member includes a second slider 6, a pressing lid 9, a second connecting member, a second seal ring member, a second tightening nut 8, and a first nut 15. The second connecting member includes a fixed seat 10, a tie rod 11, a gasket 12, and a third nut 23, and is used to detachably connect the pressing lid 9 to the bottom seat of the test device. The second seal ring member includes two third rubber rings 21 and one third stopper 22.

The second slider 6 is located inside the first slider 5, and as shown in Figs. 7 and 8, the second slider 6 is disk-shaped, and a groove is formed on the lower end surface of the second slider 6 to reduce weight. The outer surface of the second slider 6 is joined to the inner surface of the first slider 5 to achieve sealing. A ring-shaped inner seal chamber is formed between the second slider 6 and the inner surface of the first slider 5. The outer surface of the second slider 6 is provided with a second packing 38 that enters the inner seal chamber. The second packing 38 is located at the end of the inner seal chamber close to the thrust chamber 24, and its outer surface is pasted on the inner surface of the first slider 5. The second seal ring member is located in the inner seal chamber. The third stopper 22 is located between the two third rubber rings 21. The third rubber ring 21 is preferably an O-shaped seal ring. The third stopper 22 is in the shape of a complete ring, and is fitted into the inner seal chamber as a whole. A third rubber ring 21 is provided on the front and rear sides of the third stopper 22. This increases the seal length in the leakage passage and improves the reliability of the sealing structure.

Furthermore, the outer diameter of the second packing 38 matches the diameter of the throat of the thrust chamber 24. That is, the outer diameter of the second packing 38 is approximately equal to the diameter of the throat of the thrust chamber 24. The axial force received by the second slider 6 is the same as the axial force received by the throat sealing device. In this case, when the first sealing member, the second sealing member, and the thrust chamber 24 are subjected to a mechanical analysis, the resultant force of the external forces is zero. In other words, by applying almost no extra force to the thrust chamber 24, it is guaranteed that no unnecessary axial deformation occurs in the entire thrust chamber 24.

The pressing lid 9 is located inside the seal flange 4, and as shown in Figures 5 and 6, the outer surface of the pressing lid 9 has a third positioning step 34. The pressing lid 9 abuts against the end face of the seal flange 4 via the third positioning step 34 and is joined to the inner surface of the seal flange 4 for positioning. An annular second positioning step 28 is provided at the end of the pressing lid 9 toward the second slider 6. The second positioning step 28 enters the inner seal chamber and abuts against the third rubber ring 21. A second connection stud 37 is welded to the second slider 6, and the second connection stud 37 is connected to the second tightening nut 8 to realize a fixed connection between the second slider 6 and the pressing lid 9.

A third connection stud 36 is welded to the pressing lid 9, and as shown in Figures 3 and 4, a connection hole 30 is formed in the fixed seat 10 at a position corresponding to the third connection stud 36. The connection hole 30 is simply a hole. The third connection stud 36 passes through the connection hole 30 and is connected to the first nut 15, realizing a fixed connection between the pressing lid 9 and the fixed seat 10. A plurality of support seats 29 are provided on the upper end of the fixed seat 10. The plurality of support seats 29 are evenly distributed at intervals in the circumferential direction of the fixed seat 10. One end of the tie rod 11 is connected to the support seat 29 via the gasket 12 and the third nut 23, and the other end is attached to the bottom seat of the test device via a pin shaft.

Furthermore, in order to strengthen the strength of the fixed seat 10, a first reinforcing member 31, a second reinforcing member 32, and a third reinforcing member 33 are provided in the inner cavity of the fixed seat 10.

When the assembled self-sealing sealing structure is used to test the thrust chamber 24, it is necessary to check the first rubber ring 17, first stopper 18, second rubber ring 19, second stopper 20, third rubber ring 21, and third stopper 22 for cracks, differentiation, deterioration, and other phenomena, and for damage to the threads of each component before installation. If there is any, replace or repair them. When installing, install the first sealing member, second sealing member, and third sealing member in that order. The specific steps are as follows:

a. The first rubber ring 17 and the first stopper 18 are inserted into the first seal groove as shown in FIG. 2, and the end face seal flange 3 is screwed into the threaded hole of the thrust chamber head flange 26 via the first link 13 to complete the installation of the first seal member. The inner hole of the end face seal flange 3 can act as a positioning hole for the second seal member.

b) The first slider 5 is inserted into the inner hole of the face seal flange 3, and the second rubber ring 19 and the second stopper 20 are installed in the outer seal chamber as shown in FIG.
The fixed flange 1 passes through the thrust chamber head flange 26 and is fitted onto the outside of the thrust chamber 24 .
The seal flange 4 is positioned above the end face seal flange 3 and is joined to the inner hole of the end face seal flange 3 via the first positioning step 27 for positioning.
Thereafter, the inner surface of the adapter 2 is bonded to the outer surface of the thrust chamber head flange 26 , the fixed flange 1 is moved to the adapter 2 , and the outer bottom surface of the adapter 2 is bonded to the stepped surface of the fixed flange 1 .
The fixed flange 1 is fixedly connected to the seal flange 4 by the second link 14 and the second nut 16, the first slider 5 is fixedly connected to the seal flange 4 by the first connecting stud 25 and the first tightening nut 7, and the first tightening nut 7 is then slightly tightened.
The installation of the second sealing member is completed, in which case the inner hole of the seal flange 4 can act as a positioning hole for the third sealing member.

c) Place the second slider 6 within the first slider 5 and install the third rubber ring 21 and the third stopper 22 within the inner seal chamber as shown in FIG.
The pressing lid 9 is placed inside the seal flange 4, and the third positioning step 34 abuts against the end face of the seal flange 4 and is joined to the inner surface of the seal flange 4 for positioning. The second slider 6 is fixedly connected to the pressing lid 9 by the second connecting stud 37 and the second tightening nut 8, and the second tightening nut 8 can be slightly tightened.
The fixing seat 10 is placed on the upper side of the pressing lid 9 , and the pressing lid 9 is fixedly connected to the fixing seat 10 via the third connecting stud 36 and the first nut 15 .
The fixing washer 10 and the tie rod 11 are fixedly connected via the gasket 12 and the third nut 23, thereby completing the installation of the third sealing member.

After the first, second and third sealing members are installed according to the above procedure, all fastener screws are tightened, and the first and second tightening nuts 7 and 8 are tightened, so that the second and third rubber rings 19 and 21 can expand, and a sealing differential pressure is generated on the surface to ensure a reliable seal, and the installation is completed by combining self-tightening and sealing. The first and second tightening nuts 7 and 8 may be any commercially available nut, as long as they can achieve a detachable connection with the stud.

The above is a preferred embodiment of the present invention, but it is not intended to limit the present invention. Those skilled in the art may make various changes and modifications to the above methods and technical means within the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and adaptations made to the above embodiments based on the substantial technical means of the present invention are all included in the protection scope of the technical means of the present invention, provided that they do not deviate from the technical means of the present invention.

Claims (10)

1. A self-sealing assembly for a thrust chamber head used to seal the head of a thrust chamber (24) during testing, comprising:
a first sealing member, a second sealing member, and a third sealing member;
The first sealing member and the second sealing member each form an annular sealing surface at the head of the thrust chamber (24), and the sealing surfaces of the first sealing member, the second sealing member and the third sealing member are arranged in order from the outside to the inside, and jointly seal the head of the thrust chamber (24);
An assembled self-sealing sealing structure for a thrust chamber head, characterized in that a first sealing member transmits a test load force to a thrust chamber head flange (26), a second sealing member transmits the test load force to a back surface of the thrust chamber head flange (26), and a third sealing member transmits the test load force to a bottom seat of a test device. The first sealing member includes an end face seal flange (3), a first link (13), a first rubber ring (17), and a first stopper (18);
The face seal flange (3) is a ring-shaped structure and is detachably connected to a thrust chamber head flange (26) via a first link (13);
a first seal groove is provided on an end surface of the end face seal flange (3) that is bonded to the thrust chamber head flange (26), the first seal groove being annular and extending in the entire circumferential direction of the end face seal flange (3);
2. The assembled self-sealing structure for a thrust chamber head as claimed in claim 1, characterized in that a first rubber ring (17) and a first stopper (18) are provided in the first seal groove. The assembled self-sealing seal structure for a thrust chamber head as described in claim 2, characterized in that the first link (13) is a bolt that passes through a through hole in the end face seal flange (3) and is connected to a threaded hole in the thrust chamber head flange (26). The second sealing member includes a seal flange (4) and a first slider (5);
The first slider (5) has a ring-shaped structure and is located inside the end face seal flange (3). A ring-shaped outer seal chamber is formed between the first slider (5) and the inner surface of the end face seal flange (3). A first packing is provided on the outer surface of the first slider (5) and enters the outer seal chamber. The first packing is located at the end of the outer seal chamber close to the thrust chamber (24). The outer surface of the first packing is bonded to the inner surface of the end face seal flange (3). A first seal ring member is provided in the outer seal chamber.
The seal flange (4) is located on the side of the end face seal flange (3) facing away from the thrust chamber head flange (26), the seal flange (4) has a ring-shaped structure, and its lower end enters the outer seal chamber and abuts against the first seal ring member. A first positioning step (27) is provided on the outer surface of the lower end of the seal flange (4), and the first positioning step (27) abuts against the end face of the end face seal flange (3) and is bonded to the inner surface of the end face seal flange (3) for positioning;
3. The assembled self-sealing sealing structure for a thrust chamber head as described in claim 2, characterized in that the first slider (5) and the seal flange (4) are detachably fixedly connected, and the seal flange (4) is detachably connected to the thrust chamber head flange (26) via a first connecting member. The first connecting member includes a fixed flange (1), an adapter (2), and a second link (14);
The fixed flange (1) is a ring-shaped structure, the minimum inner diameter of which is greater than the outer diameter of the thrust chamber head flange (26);
The adapter (2) is an arc-shaped plate, and the corresponding central angle is less than or equal to 180°;
The inner mold surface of the adapter (2) matches the shape of the outer and lower surfaces of the thrust chamber head flange (26);
5. The assembled self-sealing structure for a thrust chamber head according to claim 4, wherein the adapter (2) is located between the thrust chamber head flange (26) and the fixed flange (1), and the fixed flange (1) and the seal flange (4) are removably fixedly connected via a second link (14). The assembled self-sealing structure for a thrust chamber head according to claim 4, characterized in that the first seal ring member includes two second rubber rings (19), and a ring-shaped second stopper (20) is provided between the two second rubber rings (19). The third sealing member includes a second slider (6) and a pressing lid (9).
The second slider (6) is located inside the first slider (5), and a ring-shaped inner seal chamber is formed between the outer surface of the second slider (6) and the inner surface of the first slider (5). A second packing (38) is provided on the outer surface of the second slider (6) and enters the inner seal chamber. The second packing (38) is located at an end of the inner seal chamber close to the thrust chamber (24), and its outer surface is bonded to the inner surface of the first slider (5). A second seal ring member is provided in the inner seal chamber.
The pressing lid (9) is located inside the seal flange (4), and the outer surface of the pressing lid (9) has a third positioning step (34). The pressing lid (9) abuts against the end surface of the seal flange (4) via the third positioning step (34) and is joined to the inner surface of the seal flange (4) to position it. An annular second positioning step (28) is provided at the end of the pressing lid (9) facing the second slider (6), and the second positioning step (28) enters the inner seal chamber and abuts against the second seal ring member.
5. The assembled self-sealing sealing structure for a thrust chamber head as described in claim 4, characterized in that the second slider (6) is removably fixedly connected to the pressing lid (9), and the pressing lid (9) is removably fixedly connected to the bottom seat of the test device via the second connecting member. The assembled self-sealing structure for a thrust chamber head according to claim 7, characterized in that the second seal ring includes two third rubber rings (21), and a ring-shaped third stopper (22) is provided between the two third rubber rings (21). The assembled self-sealing structure for a thrust chamber head as described in claim 7, characterized in that the outer diameter of the second packing (38) is adapted to the diameter of the throat of the thrust chamber (24). The second connecting member includes a fixed seat (10) and a tie rod (11),
The pressing cover (9) is provided with a plurality of third connection studs (36), and the fixing seat (10) is provided with connection holes (30) at positions corresponding to the third connection studs (36), and the third connection studs (36) pass through the connection holes (30) and are connected to the first nut (15);
8. The assembled self-sealing structure for a thrust chamber head according to claim 7, characterized in that the fixed seat (10) is provided with a plurality of support seats (29), the plurality of support seats (29) being uniformly distributed at intervals in the circumferential direction of the fixed seat (10), one end of the tie rod (11) being connected to the support seat (29) via a gasket (12) and a third nut (23), and the other end being attached to a bottom seat of a test device.

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