CN216265562U

CN216265562U - Assembling tool assembly for assembling rocket engine and rocket engine

Info

Publication number: CN216265562U
Application number: CN202122761183.7U
Authority: CN
Inventors: 刘百奇; 杨乐; 刘建设
Original assignee: Sichuan Xinghe Power Space Technology Co ltd; Beijing Xinghe Power Equipment Technology Co Ltd; Galactic Energy Beijing Space Technology Co Ltd
Current assignee: Sichuan Xinghe Power Space Technology Co ltd; Beijing Xinghe Power Equipment Technology Co Ltd; Galactic Energy Beijing Space Technology Co Ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-04-12
Anticipated expiration: 2031-11-11

Abstract

The embodiment of the application provides an assembling tool assembly for assembling a rocket engine and the rocket engine. The assembly tool assembly includes: a guide and a guide; one side of the guide piece is detachably connected with the inner circumferential surface of the opening part of the shell of the rocket engine, and the other side of the guide piece is provided with a guide groove along the axial direction of the shell; the inner circumferential surface of the opening part is provided with a first annular groove and an annular bulge adjacent to the first annular groove; the annular bulge is provided with a communicating groove along the axial direction of the shell; one end of the guide piece is close to the annular bulge so as to communicate the communication groove with the guide groove; one part of the guide member is detachably connected to the second annular groove of the outer peripheral surface of the nozzle of the rocket engine, and the other part of the guide member is configured to slide in the guide groove and the communication groove. The embodiment of the application mutually supports through the guide piece and the guide piece, and when the shell and the spray pipe of the rocket engine are assembled, the alignment assembly between the shell and the spray pipe is convenient, the difficulty of assembling the shell and the spray pipe can be reduced, and the assembling efficiency of the rocket engine is improved.

Description

Assembling tool assembly for assembling rocket engine and rocket engine

Technical Field

The application relates to the technical field of rocket assembly, in particular to an assembly tool assembly for assembling a rocket engine and the rocket engine.

Background

The lightweight design of the structural parts of the rocket engine is an important ring for improving the working performance of the rocket engine, wherein the design of the connecting structure of each part becomes a key diving means. At present, the main connecting structures adopted by the rocket engine comprise flange connection, thread connection, snap ring connection and the like, wherein the flange connection is a more conventional connecting structure, the connection is reliable, but the passive mass is heavier; compared with flange connection, the threaded connection has smaller passive quality, but is mainly used for structural connection of a smaller opening, and the situation of thread seizure easily occurs in a large-opening connection structure; the passive quality of the snap ring connection is equivalent to that of the threaded connection structure, but the applicable opening size range is wide, so that the snap ring connection becomes a preferred scheme for the current optimized connection structure design.

However, aiming at the scheme of the snap ring connection structure adopted by the combustion chamber and the spray pipe, when the opening structure at the joint of the combustion chamber and the spray pipe is large, the snap ring structure at the joint of the opening part of the shell and the spray pipe is difficult to match and clamp through naked eyes, and the assembly efficiency of the rocket engine is greatly reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides an assembly tool subassembly and rocket engine for assembling rocket engine to the shortcoming of current mode for solve the snap ring structure of the junction of the opening of the casing and the spray tube that prior art exists and be difficult to match the block through artifical naked eye, rocket engine's the technical problem of final assembly inefficiency.

In a first aspect, embodiments of the present application provide an assembly tool assembly for assembling a rocket engine, comprising: a guide and a guide;

one side of the guide piece is detachably connected with the inner circumferential surface of the opening part of the shell of the rocket engine, and the other side of the guide piece is provided with a guide groove along the axial direction of the shell; the inner circumferential surface of the opening part is provided with a first annular groove and an annular bulge adjacent to the first annular groove; the annular bulge is provided with a communicating groove along the axial direction of the shell; one end of the guide piece is close to the annular bulge so as to communicate the communication groove with the guide groove;

one part of the guide member is detachably connected to the second annular groove of the outer peripheral surface of the nozzle of the rocket engine, and the other part of the guide member is configured to slide in the guide groove and the communication groove.

Optionally, the guide is configured to guide the spout to move in an axial direction of the spout toward the inside of the housing to a designed fitting position and to be taken out from the window of the opening portion.

Optionally, the guide comprises: the base, the connecting seat and the at least two guide walls;

one side of the base is close to the inner circumferential surface of the opening part, and the other side of the base is connected with at least two guide walls;

the guide walls are arranged in parallel along the axial direction of the shell; the guide groove is formed between the guide walls;

the connecting seat is connected to the side of guide wall, and the connecting seat is used for being connected with the opening portion can be dismantled.

Optionally, the guide further comprises: a connecting member; the connecting seat is provided with a mounting hole;

the connecting piece is used for penetrating the opening part and is matched with the mounting hole for detachable connection.

Optionally, the mounting hole comprises: at least two mounting holes;

at least two mounting holes are symmetrically arranged about a central axis of the base.

Optionally, the end of the guide remote from the spout has a hexagonal slot.

Optionally, the guide is a bolt.

Optionally, the guide comprises at least two, and the guide comprises at least two;

the guide is disposed to face the inner peripheral surface of the opening.

In a second aspect, embodiments of the present application further provide a rocket engine, including: a housing and a nozzle; the housing and the nozzle tube are assembled based on the assembly tool assembly provided in the first aspect;

the housing includes an opening;

the inner circumferential surface of the opening part is provided with a first annular groove and an annular bulge adjacent to the first annular groove, and the annular bulge is provided with a communication groove along the axial direction of the shell;

the outer peripheral surface of the spray pipe is provided with a second annular groove; the bottom of the second annular groove is provided with at least one threaded hole.

Optionally, the opening portion has a window;

the window corresponds to the position of the threaded hole;

the edge of the window is provided with a notch which is communicated with the communicating groove.

The assembly tool assembly for assembling the rocket engine and the rocket engine provided by the embodiment of the application have the beneficial technical effects that:

when assembling the rocket engine, the guide piece is connected at the opening of the rocket engine shell, the guide piece is connected on the spray pipe, and the guide piece aligns the snap ring connecting structure between the spray pipe and the shell under the action of the guide piece, so that the snap ring structure at the joint of the opening of the shell and the spray pipe is easy to clamp, the assembly efficiency of the shell and the spray pipe can be improved, and the assembly efficiency of the rocket engine is further improved.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural view of a guide member of an assembly tool assembly applied to an opening portion of a housing of a rocket engine according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural view of an opening portion of a rocket motor case according to an embodiment of the present disclosure;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic structural diagram of a nozzle of a rocket engine according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural view of a guide of an assembly tool assembly according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a connecting member of a guide member according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a guide of an assembly tool assembly according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural view of a rocket motor according to an embodiment of the present disclosure in place.

In the figure:

1-a guide; 10-a guide groove; 11-a base; 12-a connecting seat; 121-mounting holes; 13-a guide wall; 14-a connector;

2-a guide; 20-hexagonal groove;

3-an opening part; 30-an inner peripheral surface of the opening; 31-a first annular groove; 32-annular protrusions; 320-a communication groove; 33-a window; 330-notch;

4-spraying a pipe; 40-the outer peripheral surface of the nozzle; 41-a second annular groove; 410-threaded hole.

Detailed Description

Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It is to be understood that the term "and/or" as used herein is intended to include all or any and all combinations of one or more of the associated listed items.

The inventor of the present application has found that:

in the prior art, the opening part of the shell is mostly circular, the connection part of the spray pipe is also circular, the spray pipe is inserted into the opening part of the shell during assembly, the spray pipe is sleeved with the opening part, and when the shell and the spray pipe are connected by adopting the scheme of the snap ring connection structure, the shell and the snap ring structure of the spray pipe need to be mutually clamped, so that the shell and the spray pipe are connected. However, since the diameter of the opening of the case is large and the radial accuracy of the snap ring connection structure is high, it is difficult to accurately find the position of the snap ring when the case is assembled with the nozzle, and it is necessary to constantly change the position until the snap ring structure between the opening of the case and the nozzle is engaged, which results in an extremely low assembly efficiency of the case and the nozzle and further a reduction in the overall assembly efficiency of the rocket engine.

The application provides an assembly tool assembly for assembling a rocket engine and the rocket engine, and aims to solve the technical problems in the prior art.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments.

An embodiment of the application provides an assembly tool assembly for assembling a rocket engine, including: a guide 1 and a guide 2.

The guide 1 is detachably connected to an inner peripheral surface 30 of an opening 3 of a rocket motor case at one side, and has a guide groove 10 extending in an axial direction of the case at the other side. The inner peripheral surface 30 of the opening 3 is provided with a first annular groove 31 and an annular projection 32 adjacent to the first annular groove 31. The annular projection 32 is provided with a communication groove 320 along the axial direction of the housing. One end of the guide 1 is close to the annular protrusion 32 to communicate the communication groove 320 with the guide groove 10.

A part of the guide 2 is adapted to be detachably connected to the second annular groove 41 of the outer circumferential surface 40 of the nozzle 4 of the rocket engine, and the other part is configured to slide in the guide groove 10 and the communication groove 320.

In this embodiment, referring to fig. 1 and 7, the guide 1 is connected to the opening 3 of the rocket engine case, the guide 2 is connected to the nozzle 4, the guide 2 is limited to slide in the guide groove 10 of the guide 1 and the communication groove 320 of the opening 3 under the action of the guide 1, and the snap ring connection structure between the nozzle 4 and the case is aligned, so that the snap ring structure at the connection position of the opening 3 of the case and the nozzle 4 is easy to be clamped, the assembly efficiency of the case and the nozzle 4 can be improved, and further the overall assembly efficiency of the rocket engine can be improved. The specific structure of the nozzle can be referred to fig. 3.

In some possible embodiments, referring to fig. 2, the guide 2 is configured to guide the spout 4 to move along the axial direction of the spout 4 towards the inside of the housing to the designed fitting position and to be taken out from the window 33 of the opening portion 3.

When the case and the nozzle 4 are assembled, the guide 2 in this embodiment is partially connected to the nozzle 4 and partially slides from the guide groove 10 to the communicating groove 320 until the nozzle 4 is guided to the designed assembly position, and since the guide 2 is an external part for guiding and is not an essential part for assembling the rocket engine, after the case and the nozzle 4 are assembled, the guide 2 as an auxiliary assembly tool needs to be detached from the nozzle 4, and therefore, a window 33 is opened at a position of the opening portion 3 of the case corresponding to the designed assembly position, and the guide 2 can be taken out from the window 33.

Alternatively, the thickness of the guide 1 is not greater than the thickness of the annular projection 32 of the opening portion 3.

Since the annular protrusion 32 is provided on the inner circumferential surface 30 of the opening portion 3 of the housing, there is at least an interval equal to the thickness of the annular protrusion 32 between the nozzle 4 and the inner circumferential surface 30 of the opening portion 3, when the housing and the nozzle 4 are assembled, the guide member 1 is first installed on the inner circumferential surface 30 of the opening portion 3, and at this time, the annular protrusion 32 is located between the first annular groove 31 and the guide member 1, and then when the nozzle 4 is guided by the guide member 2 to move to the designed assembly position, it is ensured that the nozzle 4 has a proper movement space in the opening portion 3.

In some possible embodiments, please refer to fig. 5, the guide 1 comprises: base 11, two connecting seats 12 and at least two guide walls 13.

One side of the base 11 is close to the inner peripheral surface 30 of the opening 3, and the other side of the base 11 is connected to at least two guide walls 13.

The guide walls 13 are juxtaposed in the axial direction of the housing. The guide groove 10 is formed between the guide walls 13.

A coupling holder 12 is coupled to a side surface of the guide wall 13, and the coupling holder 12 is adapted to be detachably coupled with the opening portion 3.

In this embodiment, the base 11 connects the two guide walls 13, the area enclosed by the base 11 and the two guide walls 13 is the guide groove 10, the projection of the guide groove 10 on the base 11 falls into the base 11, and when assembling, the guide member 1 is connected to the housing through the connecting seat 12, so that the inner peripheral surface 30 of the opening portion 3 is in fit connection with both the connecting seat 12 and the base 11.

In some possible embodiments, please refer to fig. 5 and 6, the guide 1 further comprises: a connecting member 14. The connection holder 12 has a mounting hole 121.

The connecting piece 14 is used for passing through the opening part 3 and being matched and detachably connected with the mounting hole 121.

In this embodiment, the connector 14 connects the opening 3 and the connecting seat 12 of the guide 1, the opening 3 has a through hole corresponding to the mounting hole 121, and the connector 14 passes through the mounting hole 121 and the through hole of the opening 3 to connect the guide 1 and the housing.

Alternatively, the connecting member 14 includes, but is not limited to, a bolt, and there may be a nut for a mating connection to fasten the housing to the guide 1.

Optionally, each connecting section 12 has a plurality of mounting holes 121 thereon.

In some possible embodiments, the mounting hole 121 includes: at least two mounting holes 121.

At least two mounting holes 121 are symmetrically disposed about a central axis of the base 11.

In this embodiment, there are at least two connecting bases 12, each connecting base 12 has one or more mounting holes 121, and connecting bases 12 are symmetrically disposed on opposite sides of two guide walls 13, so that different connecting bases 12 are symmetrical about the central axis of base 11, and mounting holes 121 on different connecting bases 12 are also symmetrical about the central axis of base 11. The opening part 3 of the housing and the nozzle pipe 4 are connected by using the connecting parts 14 at both sides of the guide groove 10, and the symmetrically arranged connecting seats 12 can ensure that the connection between the guide part 1 and the opening part 3 is more stable.

It will be appreciated that the guide 2 will eventually need to be removed from the window 33 of the housing, but the window 33 cannot be made too large to affect the performance of the housing, and removal of the guide 2 is cumbersome, so that in some possible embodiments, referring to figure 7, the end of the guide 2 remote from the spout 4 has a hexagonal recess 20.

In this embodiment, the hexagonal groove 20 is opened at the top end of the guide 2, and the guide 2 can be taken out by twisting the hexagonal groove 20 with a hexagon socket wrench, so that the requirement for the operation space is small, and the difficulty in manually taking out the guide 2 in the small window 33 is solved.

Alternatively, the guide 2 is a bolt, and a portion of the guide 2 has an external thread to be coupled with the threaded hole 410 of the nozzle 4.

It can be understood that the cross-section of the opening 3 of the housing is circular, and if the guide 1 is provided at only one position, the nozzle 4 is liable to swing left and right in the opening 3, which affects the alignment efficiency during assembly. Thus, in some possible embodiments, the guide 1 comprises at least two and the guide 2 comprises at least two.

The guide 1 is disposed to face the inner circumferential surface 30 of the opening 3.

In this embodiment, the guide members 1 are symmetrically arranged at the opposite positions of the inner peripheral surface 30 of the opening portion 3, and are matched with the corresponding guide members 2 through the two guide members 1, so that the radial direction and the circumferential direction of the opening portion 3 are limited, the spray pipe 4 is prevented from shaking in the opening portion 3, and the alignment efficiency of the spray pipe 4 and the shell is higher.

Based on the same inventive concept, the embodiment of the application provides a rocket engine, which comprises: a housing and a nozzle 4. The housing and nozzle tube 4 are assembled based on the assembly tool assembly provided in any of the embodiments described above.

The housing includes an opening 3.

The inner peripheral surface 30 of the opening 3 is provided with a first annular groove 31 and an annular projection 32 adjacent to the first annular groove 31, and the annular projection 32 is provided with a communication groove 320 extending in the axial direction of the housing.

The outer circumferential surface 40 of the nozzle 4 is provided with a second annular groove 41. The bottom of the second annular groove 41 is provided with at least one threaded hole 410.

In the present embodiment, referring to fig. 8, the connection between the casing and the nozzle 4 is an opening 3, the opening 3 is communicated with the combustion chamber, which corresponds to the opening 3 being the rear end of the combustion chamber, and the nozzle 4 can be communicated with the combustion chamber when connected to the opening 3. The communicating groove 320 is opened on the annular protrusion 32, when the guide 1 is connected to the inner circumferential surface 30 of the opening portion 3 of the housing, the tail portion is close to the annular protrusion 32, and the screw hole 410 is detachably connected to the guide 2 in a matching manner. When the guide member 2 slides in the guide groove 10, it enters the communicating groove 320 again at the annular protrusion 32 and slides out of the communicating groove 320, and the nozzle 4 is guided to the designed assembly position. After the assembly is completed, the guide part 1 and the guide part 2 are taken down, and the whole assembly process is simple to operate, low in cost and high in efficiency. In this embodiment, the assembly tool assembly provided in any of the foregoing embodiments is adopted, and the assembly tool assembly may refer to any of the foregoing embodiments, and is not described herein again.

Alternatively, a part of the guide 2 is inserted into the threaded hole 410, another part of the guide 2 protrudes from the outer circumferential surface 40 of the spout 4, and the length of the other part of the guide 2 is not greater than the thickness of the annular protrusion 32, ensuring that the guide 2 and the spout 4 can move together in the opening portion 3.

Optionally, the length of another portion of the guide 2 is no greater than the spacing between the spout 4 and the opening 3. Generally, to fit the housing tightly to the spout 4, the thickness of the annular protrusion 32 is equal to the minimum spacing between the spout 4 and the opening 3.

Alternatively, referring to fig. 2 and 3, the opening portion 3 has a window 33.

The window 33 corresponds to the position of the screw hole 410.

The edge of the window 33 has a notch 330, and the notch 330 communicates with the communication groove 320.

During assembly, when the guide member 2 slides in the guide groove 10, the guide member 2 enters the communicating groove 320 again at the annular protrusion 32 and slides out of the communicating groove 320, and the window 33 has the notch 330 communicating with the communicating groove 320, so that the guide member 2 reaches the range of the window 33 from the communicating groove 320, and after the guide nozzle 4 reaches the design position, the guide member 2 is taken out through the window 33 in the embodiment.

Alternatively, the launch vehicle includes, but is not limited to, a solid launch vehicle.

By applying the embodiment of the application, at least the following beneficial effects can be realized:

1. guide 1 connects the opening 3 at the rocket engine casing, guide 2 connects on spray tube 4, guide 2 is under guide 1's effect, by restricting sliding in guide way 10 of guide 1 and the intercommunication groove 320 of opening 3, counterpoint the snap ring connection structure between spray tube 4 and the casing, make the easy block of snap ring structure of the opening 3 of casing and the junction of spray tube 4, can improve the assembly efficiency of casing and spray tube 4, and then improve rocket engine's total equipment efficiency, and this tool assembly can used repeatedly, moreover, the steam generator is simple in structure, and the cost is lower.

2. Two guide walls 13 are connected to base 11, and the region in the city is promptly guide way 10 in base 11 and two guide walls 13, and the projection of guide way 10 on base 11 falls into in base 11, and when the assembly, guide 1 connects on the casing through connecting seat 12, makes the inner peripheral surface 30 of opening 3 and connecting seat 12 and the equal laminating of base 11 be connected.

3. Different connecting bases 12 are symmetrical about the central axis of the base 11, and the mounting holes 121 on different connecting bases 12 are also symmetrical about the central axis of the base 11. The opening part 3 of the housing and the nozzle pipe 4 are connected by using the connecting parts 14 at both sides of the guide groove 10, and the symmetrically arranged connecting seats 12 can ensure that the connection between the guide part 1 and the opening part 3 is more stable.

4. The hexagonal groove 20 is arranged at the top end of the guide part 2, the guide part 2 can be taken out by twisting the hexagonal groove 20 through an inner hexagonal wrench, the requirement on the operation space is low, and the difficulty of manually taking out the guide part 2 in the small window 33 is solved.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.

Claims

1. An assembly tool assembly for assembling a rocket engine, comprising: a guide and a guide;

one side of the guide piece is detachably connected with the inner circumferential surface of an opening part of a shell of the rocket engine, and the other side of the guide piece is provided with a guide groove along the axial direction of the shell; the inner circumferential surface of the opening part is provided with a first annular groove and an annular bulge adjacent to the first annular groove; the annular bulge is provided with a communication groove along the axial direction of the shell; one end of the guide piece is close to the annular bulge so that the communication groove is communicated with the guide groove;

one part of the guide member is detachably connected to a second annular groove in the outer peripheral surface of the nozzle of the rocket engine, and the other part of the guide member is configured to slide in the guide groove and the communication groove.

2. The assembly tool assembly of claim 1, wherein the guide is configured to guide the spout to move in an axial direction of the spout toward the housing to a design assembly position and to be removed from the window of the opening portion.

3. The assembly tool assembly of claim 1, wherein the guide comprises: the base, the connecting seat and the at least two guide walls;

the connecting seat is connected to the side surface of the guide wall, and the connecting seat is detachably connected with the opening part.

4. The assembly tool assembly of claim 3, wherein the guide further comprises: a connecting member; the connecting seat is provided with a mounting hole;

5. The assembly tool assembly of claim 4, wherein the mounting hole comprises: at least two mounting holes;

at least two mounting holes are symmetrically arranged about the central axis of the base.

6. The assembly tool assembly of claim 1, wherein an end of the guide distal from the spout has a hex slot.

7. The assembly tool assembly of claim 1, wherein the guide is a bolt.

8. The assembly tool assembly of any one of claims 1-7, wherein the guide comprises at least two, the guide comprises at least two;

the guide is disposed to face an inner peripheral surface of the opening.

9. A rocket engine, comprising: a housing and a spout assembled based on the assembly tool assembly of any one of claims 1-8;

the housing includes an opening;

a second annular groove is formed in the outer peripheral surface of the spray pipe; the bottom of the second annular groove is provided with at least one threaded hole.

10. A rocket engine as recited in claim 9, wherein said open portion has a window;

the window corresponds to the position of the threaded hole;

the edge of the window is provided with a notch, and the notch is communicated with the communication groove.