Engine head structure, engine head, engine and liquid rocket

Abstract

The utility model embodiment provides a kind of engine head structure, engine head, engine and liquid rocket, and this engine head structure includes force bearing top cover (1) and gimbals (2), force bearing top cover (1) is integrated structure, force bearing top cover (1) includes first thrust chamber top (11) and oppositely arranged first vertical support (12) and second vertical support (13);Gimbals (2) are above the first vertical support (12) and the second vertical support (13), with the first vertical support (12) and the second vertical support (13) can be connected to form the installation space of placement cross shaft (3), and form the swing space of cross shaft (3) swing between the first vertical support (12) and the second vertical support (13).Finally reduce the overall height of engine, thrust transmission path is shortened, and force is more direct, improves the positioning accuracy of thrust line, and lightens engine structure mass.

Description

Technical Field

[0001] This utility model relates to the field of rockets, specifically to an engine head structure, an engine head, an engine, and a liquid rocket. Background Technology

[0002] The thrust chamber, a common component in liquid rocket engines, primarily functions to transfer engine thrust to the frame or rocket's load-bearing structure and to enable the thrust chamber to rotate around its axis. For example... Figure 5 As shown, in the prior art, the constant level seat is an independent component. The constant level seat usually includes a lower base 200, a lower support 300, a cross shaft 400, an upper support 500, and an upper base 600. The lower base 200 is connected to the top cover bearing flange 101 of the top of the second thrust chamber 100, and the upper base 600 is connected to the frame or the liquid rocket bearing structure. The connection method is usually fastener connection.

[0003] In the process of developing this utility model, the applicant discovered at least the following problems in the prior art:

[0004] 1. The upper base 600 and lower base 200 of the constant level seat have a limiting effect on the swing angle of the cross shaft. In order to meet the swing angle requirements, the distance between the cross shaft and the upper base 600 and the lower base 200 is relatively large, resulting in a large space occupation and an increase in engine height.

[0005] 2. To ensure the strength and rigidity after assembly with the constant level seat, the top cover bearing flange 101 on the top cover of the second thrust chamber 100 needs to be designed separately; the overall strength and rigidity margin is redundant after assembly with the constant level seat, resulting in a large engine structural weight.

[0006] 3. The thrust is transmitted sequentially through the top cover bearing flange 101 of the second thrust chamber top 100, the lower base 200, the lower support 300, the cross shaft 400, the upper support 500, and the upper base 600. The transmission path is long and the force transmission is not direct enough.

[0007] 4. The lower base 200 and the lower support 300 are connected by threads, and the upper support 500 and the upper base 600 are connected by threads, resulting in insufficient connection rigidity.

[0008] 5. Using fasteners to connect the constant level seat to the thrust chamber increases the connection links, resulting in a large structural weight, poor thrust line positioning, and low reliability. Utility Model Content

[0009] This utility model provides an engine head structure, an engine head, an engine, and a liquid rocket, which can solve the above-mentioned problems in the prior art.

[0010] To achieve the above objectives, in a first aspect, embodiments of the present invention provide an engine head structure, comprising:

[0011] A load-bearing top cover, wherein the load-bearing top cover is an integral structure, and the load-bearing top cover includes the top of a first thrust chamber and a first vertical support and a second vertical support disposed opposite to each other;

[0012] The constant level frame is mounted on the first vertical support and the second vertical support, and can cooperate with the first vertical support and the second vertical support to form an installation space for placing the cross shaft, and to form a swing space for the cross shaft to swing between the first vertical support and the second vertical support.

[0013] Secondly, this utility model embodiment provides an engine head, including a cross shaft and the aforementioned engine head structure, wherein the cross shaft is installed within the installation space;

[0014] The cross axis includes a first axis and a second axis that are perpendicular to each other, and the second axis is also housed within the swing space.

[0015] Thirdly, this utility model embodiment provides an engine, including an engine thrust chamber, the engine thrust chamber including the aforementioned engine head.

[0016] Fourthly, this utility model provides a liquid rocket, including the aforementioned engine.

[0017] The above technical solution has the following beneficial effects: Because the lower base in the prior art is eliminated, there are no components between the first and second vertical supports, reducing the number of parts and thus increasing the swing space of the cross shaft. At the same extreme swing angle, the height of the first and second vertical supports can be appropriately reduced, ultimately lowering the overall height of the engine. This shortens the transmission path of the engine nozzle thrust to the engine mounting base, making the force transmission more direct. Eliminating bolted connections improves overall rigidity, enhances thrust line positioning accuracy, and reduces the engine's structural weight. It is suitable for mass production. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a first axonometric view of an engine head structure according to an embodiment of the present invention;

[0020] Figure 2This is a second axonometric view of an engine head structure according to an embodiment of the present invention;

[0021] Figure 3 This is a front view of an engine head structure according to an embodiment of the present utility model;

[0022] Figure 4 This is a top view of an engine head structure according to an embodiment of the present utility model;

[0023] Figure 5 This is a schematic diagram of a conventional leveling seat.

[0024] The reference numerals in the attached figures are as follows:

[0025] 1. Load-bearing top cover; 2. Leveling frame; 3. Cross shaft; 4. Shaft clamp; 5. Bolt pair;

[0026] 11. Top of the first thrust chamber; 12. First vertical support; 13. Second vertical support; 14. Reinforcing rib;

[0027] 21. Third vertical support;

[0028] 22. Base;

[0029] 31. First axis; 32. Second axis;

[0030] 121. First semicircular groove; 131. Second semicircular groove;

[0031] 211. First vertical board; 212. Second vertical board; 213. Third vertical board; 214. Fourth vertical board;

[0032] 2111, Third semicircular groove; 2121, Fourth semicircular groove; 2131, Fifth semicircular groove; 2141, Sixth semicircular groove; 111, Propellant inlet pipe;

[0033] 100. Top of the second thrust chamber; 200. Lower base; 300. Lower support; 400. Cross shaft; 500. Upper support; 600. Upper base; 101. Top cover bearing flange. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] like Figure 1 and Figure 2As shown in the figure, in conjunction with an embodiment of the present invention, an engine head structure is provided, comprising:

[0036] The load-bearing top cover 1 is an integrated structure, comprising a first thrust chamber top 11 and a first vertical support 12 and a second vertical support 13 disposed opposite to each other. In this embodiment of the present invention, the lower base 200 in the prior art is eliminated, and the first vertical support 12 and the second vertical support 13 are directly integrated with the first thrust chamber top 11 as an integrated structural whole. The existing level seat part structure is integrated with the thrust chamber, and the level seat is no longer an independent component.

[0037] The constant level frame 2 is disposed on the first vertical support 12 and the second vertical support 13. It can cooperate with the first vertical support 12 and the second vertical support 13 to form an installation space for placing the cross shaft 3, and to form a swing space for the cross shaft 3 to swing between the first vertical support 12 and the second vertical support 13, which can meet the swing angle requirements of the cross shaft 3.

[0038] The load-bearing top cover 1 and the constant level frame 2 make the engine head structure a highly integrated high-thrust pump-press engine head structure.

[0039] Because the lower base 200 in the prior art is eliminated, there are no components between the first vertical support 12 and the second vertical support 13. With fewer parts, the swing space of the cross shaft 3 can be increased. At the same extreme swing angle, the height of the first vertical support 12 and the second vertical support 13 can be appropriately reduced, ultimately lowering the overall height of the engine. The transmission path of the engine nozzle thrust to the engine mounting base is shortened, making the force transmission more direct. Eliminating bolted connections improves overall rigidity, thrust line positioning accuracy, and reduces the engine's structural weight. This makes it suitable for mass production.

[0040] Preferably, the first vertical support 12 is welded to the upper outer wall of the top 11 of the first thrust chamber, and the second vertical support 13 is welded to the upper outer wall of the top 11 of the first thrust chamber. Welded connections improve load-bearing capacity compared to bolted connections in the prior art.

[0041] Preferably, the constant leveling frame 2 is an integrated structure. The constant leveling frame 2 is used to mount the engine on the rocket body. The constant leveling frame 2 adopts an integrated structure, which is different from the multiple parts in the prior art. The upper support 500 and the upper base 600 are independent parts, which reduces the height of the constant leveling frame 2. Therefore, it directly reduces the overall height of the engine. Thus, on the one hand, it improves the connection strength and rigidity, and on the other hand, it improves the thrust line positioning accuracy.

[0042] Preferably, such as Figure 1 As shown, the constant level frame 2 includes a third vertical support 21 and a base 22 that is located on the third vertical support 21 and connected to the third vertical support 21 and is horizontally arranged. The constant level frame 2 is an integrated structure. In order to facilitate functional differentiation and identification, the structures in different positions are named separately, namely, the third vertical support 21 and the base 22.

[0043] The third vertical support 21 can cooperate with the first vertical support 12 and the second vertical support 13 to form an installation space for placing the cross shaft 3, and a swing space for the cross shaft 3 to swing between the first vertical support 12 and the second vertical support 13. The integrated horizontal frame 2, through the provided third vertical support 21, can jointly construct the installation space and swing space for placing the cross shaft 3, while also reducing the height of the horizontal frame 2 and the overall height of the engine.

[0044] Preferably, such as Figure 1 and Figure 3 As shown, the top end of the first vertical support 12 has a recessed first semi-circular groove 121, and the top end of the second vertical support 13 has a recessed second semi-circular groove 131. The axis of the first semi-circular groove 121 is coaxial with the axis of the second semi-circular groove 131. The first semi-circular groove 121 and the second semi-circular groove 131 are used to install the first shaft 31 of the cross shaft 3.

[0045] The third vertical support 21 has a first vertical plate 211 and a second vertical plate 212 arranged opposite to each other. The top ends of the first vertical plate 211 and the second vertical plate 212 are connected to the base 22. The constant level frame 2 is an integrated structure. In order to facilitate functional differentiation and identification, the structures at different positions of the third vertical support 21 are named separately, namely, the first vertical plate 211 and the second vertical plate 212.

[0046] The bottom end of the first vertical plate 211 has an upwardly recessed third semicircular groove 2111, and the bottom end of the second vertical plate 212 has an upwardly recessed fourth semicircular groove 2121. The axis of the third semicircular groove 2111 and the axis of the fourth semicircular groove 2121 are coaxial. The third semicircular groove 2111 and the fourth semicircular groove 2121 are used to install the first shaft 31 of the cross shaft 3.

[0047] The first semicircular groove 121 and the third semicircular groove 2111 are used to cooperate in installing the first end of the first shaft 31 of the cross shaft 3; the second semicircular groove 131 and the fourth semicircular groove 2121 are used to cooperate in installing the second end of the first shaft 31 of the cross shaft 3.

[0048] In the existing technology, the lower base 200 is bolted to the lower support 300, and the lower base 200 is bolted to the top cover bearing flange 101. The assembly accuracy will be much lower than the design accuracy, thus reducing the installation accuracy of the cross shaft 3.

[0049] In this embodiment of the utility model, the load-bearing top cover 1 is an integrated structure. Therefore, after the first thrust chamber top 11, the first vertical support 12, and the second vertical support 13 form an integrated structure (e.g., welded together to form an integrated structure), the processing of the first semi-circular groove 121 and the second semi-circular groove 131 will improve the processing accuracy of both and bring them closer to the design accuracy value. Therefore, the axial positioning accuracy of both will also be improved. Similarly, since the constant level frame 2 is an integrated structure, after the first vertical plate 211 and the second vertical plate 212 form an integrated structure with the base 22 (e.g., welded together to form an integrated structure), the processing of the third semi-circular groove 2111 and the fourth semi-circular groove 2121 will also improve the processing accuracy of both and bring them closer to the design accuracy value. Therefore, the axial positioning accuracy of both will also be improved. Therefore, after the first shaft 31 (also called the long shaft) of the cross shaft 3 is installed, the accuracy of the alignment between the axis of each groove and the axis of the first shaft 31 will also be improved, thus providing the swing accuracy of the cross shaft 3; the accuracy of the alignment between the thrust line of the engine nozzle and the center of the cross shaft will be higher, and the positioning accuracy of the thrust line will also be improved.

[0050] Preferably, such as Figure 2 As shown, the third vertical support 21 has a third vertical plate 213 and a fourth vertical plate 214 arranged opposite to each other, and the top ends of the third vertical plate 213 and the fourth vertical plate 214 are connected to the base 22;

[0051] The third vertical plate 213 and the fourth vertical plate 214 are respectively connected to the adjacent first vertical plate 211 and second vertical plate 212; the constant level frame 2 is an integrated structure. In order to facilitate functional differentiation and identification, the structures at different positions of the third vertical support 21 are named separately, namely, the third vertical plate 213 and the fourth vertical plate 214.

[0052] The bottom end of the third vertical plate 213 has an upwardly concave fifth semicircular groove 2131, and the bottom end of the fourth vertical plate 214 has an upwardly concave sixth semicircular groove 2141. The axis of the fifth semicircular groove 2131 is coaxial with the axis of the sixth semicircular groove 2141; the axis of the fifth semicircular groove 2131 is perpendicular to the axis of the first semicircular groove 121.

[0053] The fifth semicircular groove 2131 and the sixth semicircular groove 2141 are used to install the second shaft 32 of the cross shaft 3. The second shaft 32 is also accommodated in the installation space and swing space between the first vertical support 12 and the second vertical support 13.

[0054] The accuracy of the alignment between the axis of the first shaft 31 of the cross shaft 3 and the axes of the first semicircular groove 121, the second semicircular groove 131, the third semicircular groove 2111, and the fourth semicircular groove 2121 has been improved.

[0055] Because the constant level frame 2 is an integrated structure, after the first vertical plate 211, the second vertical plate 212, the third vertical plate 213, and the fourth vertical plate 214 form an integrated structure with the base 22 (e.g., welded together), machining the third semi-circular grooves 2111 and 2121 on the third vertical plate 213 and the fourth vertical plate 214 will improve the machining accuracy of the third semi-circular grooves 2111 and 2121. Therefore, the axial positioning accuracy of the third semi-circular grooves 2111 and 2121 will also be improved, and will be closer to the design accuracy value. The installation accuracy of the second shaft 32 (also called the short shaft) of the cross shaft 3 will also be improved; the accuracy of the coincidence of the thrust line of the engine nozzle with the center of the cross shaft will be higher, and the positioning accuracy of the thrust line will also be improved. At the same time, the cross shaft 3 can make full use of the swing space designed for it when swinging, and the swing range can be closer to the design value.

[0056] Preferably, such as Figure 1 As shown, the top 11 of the first thrust chamber has a propellant inlet pipe 111, which is connected to the side wall of the top 11 of the first thrust chamber.

[0057] The axis of the first semicircular groove 121 and the axis of the third semicircular groove 2111 form a first plane. The angle between the projection of the axis of the propellant inlet pipe 111 onto the first plane and the projection of the axis of the first semicircular groove 121 onto the first plane is 10° to 80°. The angle between the projection of the axis of the propellant inlet pipe 111 onto the first plane and the projection of the axis of the fifth semicircular groove 2131 onto the first plane is 10° to 80°.

[0058] The propellant inlet pipe 111 maintains a certain angle with the first axis 31 and the second axis 32 of the cross shaft 3, with the angle ranging from 10° to 80°. Figure 4 The diagram shows the angle α between the propellant inlet pipe 111 and the first shaft 31, which causes the first shaft 31, the second shaft 32, and the propellant inlet pipe 111 to be offset. Because the propellant inlet pipe 111 is convex upwards and slightly higher than the top 11 of the first thrust chamber, it helps to avoid collisions between the pipes of other components and the propellant inlet pipe 111 when rotating around the cross shaft 3. This allows the cross shaft 3 to swing within a smaller swing space, eliminating the need to deliberately increase the vertical swing space of the cross shaft 3 to avoid collisions with the pipes of other components, thereby reducing the swing height and the overall height of the machine.

[0059] Preferably, such as Figure 1 As shown, the engine head structure further includes reinforcing ribs 14 at the lower part between the first vertical support 12 and the second vertical support 13. The reinforcing ribs 14 are connected to the lower part between the first vertical support 12 and the second vertical support 13, and also to the upper outer wall of the top 11 of the first thrust chamber. The reinforcing ribs 14 are located near the bottom ends of the first vertical support 12, which are also the bottom ends of the second vertical support 13. While increasing the strength of the load-bearing top cover 1 and reducing the height of the engine head structure, they also leave the middle part of the bottom of the first vertical support 12 unoccupied, thus ensuring sufficient sway space.

[0060] In summary, by integrating the first vertical support 12 and the second vertical support 13 with the top of the first thrust chamber 11 into a single structure, the engine height is reduced (by 10mm, approximately 8% of the total height) while maintaining structural strength and rigidity, thus shortening the thrust transmission path. This also reduces installation errors, improves the installation accuracy of the load-bearing top cover 1 and the constant-level frame 2, improves the installation accuracy of the cross shaft, and improves the thrust line positioning accuracy. Furthermore, it reduces the engine's structural mass and enhances both rigidity and strength.

[0061] In conjunction with embodiments of this utility model, an engine head is provided, including a cross shaft 3 and any of the aforementioned engine head structures, wherein the cross shaft 3 is installed within the installation space; the cross shaft 3 includes a first shaft 31 and a second shaft 32 that are perpendicular to each other, and the second shaft 32 is also accommodated within the swing space.

[0062] The first end of the first shaft 31 is installed in the first semicircular groove 121 and the third semicircular groove 2111 by the upper and lower paired shaft clamps 4, and the second end of the first shaft 31 is installed in the second semicircular groove 131 and the fourth semicircular groove 2121. The upper and lower paired shaft clamps 4 are connected by bolt pairs 5, that is, the first shaft 31 is installed on the load-bearing top cover 1 and the constant level frame 2; the first end of the second shaft 32 is installed in the fifth semicircular groove 2131, and the second end of the second shaft 32 is installed in the sixth semicircular groove 2141, that is, the second shaft 32 is installed on the constant level frame 2 and accommodated in the swing space. The shaft clamps 4 are general-purpose parts, which can improve interchangeability and facilitate mass production.

[0063] The first shaft 31 and the second shaft 32 are two intersecting shafts that can rotate independently. When the engine thrust chamber is subjected to an external force F, the external force F can be divided into three directional components at the point of application: a first component F1 along the first shaft 31, a second component F2 along the second shaft 32, and a third component F3 perpendicular to the plane formed by the two shafts (the first shaft 31 and the second shaft 32). Since the point of application of the external force and the intersection of the two shafts do not coincide, F1 and F3 will cause the engine thrust chamber to rotate around the cross shaft 3. Similarly, F2 and F3 will cause the engine thrust chamber and the cross shaft 3 to rotate together around the leveling frame 2, ultimately achieving the above two degrees of freedom of rotation of the engine thrust chamber relative to the leveling frame 2, that is, 360° rotation on the plane formed by the two shafts (the first shaft 31 and the second shaft 32).

[0064] One-way oscillation can also be achieved by fusing the cross shaft 3 with the load-bearing top cover 1. Alternatively, one-way oscillation can be achieved by fusing the cross shaft 3 with the leveling frame 2. That is, the cross shaft 3 still includes a first shaft 31 and a second shaft 32 that are perpendicular to each other. The connection between the cross shaft 3 and the load-bearing top cover 1 is fixed by welding or other means, so that the first shaft 31 no longer rotates relative to the load-bearing top cover 1; only the connection between the cross shaft 3 and the leveling frame 2 can rotate around the second shaft 32. Therefore, the engine thrust chamber can rotate around the second shaft 32, i.e., unidirectional oscillation. Similarly, by constraining the connection between the cross shaft 3 and the leveling frame (i.e., the second shaft 32), allowing only the cross shaft 3 and the load-bearing top cover 1 to rotate around the first shaft 31, unidirectional oscillation can also be achieved.

[0065] In conjunction with the embodiments of this utility model, an engine is provided, including an engine thrust chamber, wherein the engine thrust chamber includes the aforementioned engine head.

[0066] In conjunction with embodiments of this utility model, a liquid rocket is provided, including the aforementioned engine.

[0067] It should be understood that in the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be interpreted as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the present invention is in a state with fewer features than all of the disclosed individual embodiments. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the present invention.

[0068] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use this invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the widest scope of the principles and novel features disclosed in this application.

[0069] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0070] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An engine head structure, characterized in that, include: The load-bearing top cover (1) is an integral structure, and the load-bearing top cover (1) includes a first thrust chamber top (11) and a first vertical support (12) and a second vertical support (13) arranged opposite to each other; The constant level frame (2) is disposed on the first vertical support (12) and the second vertical support (13), and is connected with the first vertical support (12) and the second vertical support (13) to form an installation space for placing the cross shaft (3), and to form a swing space for the cross shaft (3) to swing between the first vertical support (12) and the second vertical support (13).

2. The engine head structure according to claim 1, characterized in that, The first vertical support (12) is welded to the upper outer wall of the top of the first thrust chamber (11), and the second vertical support (13) is welded to the upper outer wall of the top of the first thrust chamber (11).

3. The engine head structure according to claim 1, characterized in that, The constant level frame (2) is an integrated structure.

4. The engine head structure according to claim 1, characterized in that, The constant level frame (2) includes a third vertical support (21) and a base (22) that is disposed on the third vertical support (21), connected to the third vertical support (21), and horizontally arranged; The third vertical support (21) cooperates with the first vertical support (12) and the second vertical support (13) to form an installation space for placing the cross shaft (3) and a swing space for the cross shaft (3) to swing between the first vertical support (12) and the second vertical support (13).

5. The engine head structure according to claim 4, characterized in that, The top end of the first vertical support (12) has a recessed first semi-circular groove (121), and the top end of the second vertical support (13) has a recessed second semi-circular groove (131). The axis of the first semi-circular groove (121) is coaxial with the axis of the second semi-circular groove (131). The first semi-circular groove (121) and the second semi-circular groove (131) are used to install the first shaft (31) of the cross shaft (3). The third vertical support (21) has a first vertical plate (211) and a second vertical plate (212) arranged opposite to each other, and the top ends of the first vertical plate (211) and the second vertical plate (212) are connected to the base (22); The bottom end of the first vertical plate (211) has an upwardly recessed third semi-circular groove (2111), and the bottom end of the second vertical plate (212) has an upwardly recessed fourth semi-circular groove (2121). The axis of the third semi-circular groove (2111) and the axis of the fourth semi-circular groove (2121) are coaxial. The third semi-circular groove (2111) and the fourth semi-circular groove (2121) are used to install the first shaft (31) of the cross shaft (3). The first semicircular groove (121) and the third semicircular groove (2111) are used to cooperate in installing the first end of the first shaft (31) of the cross shaft (3); the second semicircular groove (131) and the fourth semicircular groove (2121) are used to cooperate in installing the second end of the first shaft (31) of the cross shaft (3).

6. The engine head structure according to claim 5, characterized in that, The third vertical support (21) has a third vertical plate (213) and a fourth vertical plate (214) arranged opposite to each other, and the top ends of the third vertical plate (213) and the fourth vertical plate (214) are connected to the base (22); The third vertical plate (213) and the fourth vertical plate (214) are respectively connected to the adjacent first vertical plate (211) and second vertical plate (212); The bottom end of the third vertical plate (213) has an upwardly recessed fifth semicircular groove (2131), and the bottom end of the fourth vertical plate (214) has an upwardly recessed sixth semicircular groove (2141). The axis of the fifth semicircular groove (2131) is coaxial with the axis of the sixth semicircular groove (2141); the axis of the fifth semicircular groove (2131) is perpendicular to the axis of the first semicircular groove (121). The fifth semicircular groove (2131) and the sixth semicircular groove (2141) are used to install the second shaft (32) of the cross shaft (3), and the second shaft (32) is also accommodated in the installation space and swing space between the first vertical support (12) and the second vertical support (13).

7. The engine head structure according to claim 6, characterized in that, The top (11) of the first thrust chamber has a propellant inlet pipe (111) which is connected to the side wall of the top (11) of the first thrust chamber; The axis of the first semicircular groove (121) and the axis of the third semicircular groove (2111) form a first plane. The angle between the projection of the axis of the propellant inlet pipe (111) onto the first plane and the projection of the axis of the first semicircular groove (121) onto the first plane is 10° to 80°. The angle between the projection of the axis of the propellant inlet pipe (111) onto the first plane and the projection of the axis of the fifth semicircular groove (2131) onto the first plane is 10° to 80°.

8. The engine head structure according to claim 1, characterized in that, It also includes a reinforcing rib (14) at the lower part between the first vertical support (12) and the second vertical support (13), the reinforcing rib (14) being connected to the lower part between the first vertical support (12) and the second vertical support (13) and to the upper outer wall of the top of the first thrust chamber (11).

9. An engine head, characterized in that, Includes a cross shaft (3) and an engine head structure as described in any one of claims 1-8, wherein the cross shaft (3) is mounted within the mounting space; The cross axis (3) includes a first axis (31) and a second axis (32) that are perpendicular to each other, and the second axis (32) is also housed within the swing space.

10. An engine, characterized in that, It includes an engine thrust chamber, which includes the engine head as described in claim 9.

11. A liquid rocket, characterized in that, Includes the engine as described in claim 10.

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