A liquid rocket engine injector

Abstract

The present invention discloses a liquid rocket engine injector, which includes a top cover, a first bottom body, a second bottom body, a first nozzle, a bolt head and a magnetic attraction assembly. During the operation of the liquid rocket engine injector, by changing the magnetic pole state of the end of the magnetic attraction assembly close to the top cover, an attraction or repulsion effect is formed with the first nozzle having a first magnetic pole, thereby driving the first nozzle to move away from or close to the top cover, and changing the distance between the first inclined surface and the second inclined surface through the movement of the first nozzle, so as to control the ejecta in the second chamber to be ejected from between the first inclined surface and the second inclined surface at different flow rates. At the same time, in cooperation with the change of the magnetic force of the magnetic attraction assembly, precise and rapid adjustment control of the throttle area of the injector is realized, and the adjustment process is simple and efficient, and reliable adjustment operations can be carried out repeatedly under complex working conditions.

Description

Technical Field

[0001] This application relates to the technical field of liquid rocket injectors, and particularly to a liquid rocket engine injector. Background Art

[0002] The information provided in this section is for the purpose of generally presenting the background of the present disclosure. To the extent described in this section, the work of the currently named inventors and aspects that may not constitute prior art descriptions at the time of filing are neither expressly nor implicitly considered prior art to the present disclosure.

[0003] The throttling ability of a liquid rocket engine is the key to the recoverability of a liquid rocket. With the development of reusable launch vehicle technology, the overall rocket has higher and higher requirements for the deep throttling ability of the engine. Traditional fixed-structure injectors can no longer meet the needs of the rocket, and the injector must be able to achieve adjustable throttling structures. A liquid rocket engine, especially a large-thrust engine injector, generally consists of hundreds of pairs of nozzles with numerous parts. Traditional mechanical and hydraulic adjustment methods have disadvantages such as complex structures, difficult adjustment, and low adjustment accuracy, making them extremely inconvenient to use and having low reliability, which has become the main source of failures for variable-thrust liquid rocket engines. Summary of the Invention

[0004] In view of the defects existing in the prior art, this application provides a liquid rocket engine injector to solve the problems of difficult adjustment, low accuracy, and low reliability of traditional-structured injectors in the prior art.

[0005] The above object of this application is mainly achieved through the following technical solutions:

[0006] A liquid rocket engine injector, comprising:

[0007] A top cover, a first bottom body, and a second bottom body arranged in sequence. There is a first chamber between the top cover and the first bottom body, and a second chamber between the first bottom body and the second bottom body;

[0008] Multiple first nozzles having a first magnetic pole. The multiple first nozzles respectively penetrate through the first bottom body and the second bottom body. There is a first discharge channel communicating with the second chamber between the first nozzle and the second bottom body, and a first inclined surface is provided on the inner wall of the first discharge channel away from the second chamber;

[0009] A bolt head, which is arranged at the end of the first nozzle, and a second inclined surface is provided on the outer side wall of the bolt head;

[0010] The magnetic attraction assembly is arranged on the side of the top cover away from the first bottom body, and the magnetic attraction assembly can drive the first nozzle to move away from or close to the top cover, so as to increase or decrease the distance between the first inclined surface and the second inclined surface.

[0011] Furthermore, the outer diameter of one end of the bolt head away from the first nozzle is larger than that of the other end, and the second inclined surface is arranged parallel to the first inclined surface.

[0012] Furthermore, a variable nozzle is formed between the first inclined surface and the second inclined surface, and the cross-sectional area of the variable nozzle is not larger than the cross-sectional area of the first discharge channel.

[0013] Furthermore, a third bottom body is arranged on the side of the second bottom body away from the first bottom body, and a third chamber is arranged between the third bottom body and the second bottom body. The first nozzle penetrates to the side of the third bottom body away from the second bottom body.

[0014] Furthermore, a second nozzle is arranged on the third bottom body. The second nozzle is coaxially arranged with the first nozzle, and a second discharge channel communicating with the third chamber is formed in the second nozzle.

[0015] Furthermore, a separating cylinder is arranged on the second bottom body. The separating cylinder is coaxially arranged with the first nozzle. The ends of the separating cylinder, the first nozzle and the second nozzle away from the top cover are flush or indented. The first discharge channel is located inside the separating cylinder, and the second discharge channel is located outside the separating cylinder.

[0016] Furthermore, the magnetic attraction assembly includes a coil group for electrifying. The coil group is connected with a controller for changing the direction and magnitude of the current on the coil group through a cable.

[0017] Furthermore, a displacement sensor for obtaining the displacement of the first nozzle is arranged on the side of the top cover close to the first chamber.

[0018] Furthermore, a dynamic seal is arranged on the outer wall of the first nozzle, and the dynamic seal is located between the first nozzle and the first bottom body.

[0019] Furthermore, a constraint part for restricting the separation of the first nozzle from the first bottom body is arranged on the first nozzle.

[0020] Compared with the prior art, the advantages of the present application are as follows:

[0021] In this application, the top cover, the first bottom body, and the second bottom body are arranged in sequence. A first chamber is provided between the top cover and the first bottom body, and a second chamber is provided between the first bottom body and the second bottom body. A plurality of first nozzles with first magnetic poles respectively penetrate through the first bottom body and the second bottom body. A first discharge channel between the first nozzle and the second bottom body communicates with the second chamber, and a first inclined surface is provided on the inner wall of the first discharge channel. A plug head with a second inclined surface on its outer side wall is provided at the end of the first nozzle. A magnetic attraction assembly is provided on the side of the top cover away from the first bottom body. During the operation of this liquid rocket engine injector, by changing the magnetic pole state of the end of the magnetic attraction assembly close to the top cover, an attractive or repulsive effect is achieved with the first nozzle having the first magnetic pole, thereby driving the first nozzle to move away from or close to the top cover, and changing the distance between the first inclined surface and the second inclined surface by the movement of the first nozzle, so as to control the ejecta in the second chamber to spray out from between the first inclined surface and the second inclined surface with different flow rates. At the same time, in coordination with the change in the magnetic force of the magnetic attraction assembly, precise and rapid adjustment control of the throttle area of the injector is realized, and the adjustment process is simple and efficient, and reliable adjustment operations can be carried out repeatedly under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a partial cross-sectional view of the liquid rocket engine injector provided by the embodiment of the present application;

[0024] Figure 2 It is a bottom view of the liquid rocket engine injector provided by the embodiment of the present application;

[0025] Figure 3 It is an attachment provided by the embodiment of the present application Figure 1 The partial structural schematic diagram at the first nozzle in A in the figure;

[0026] In the figure: 11. Top cover; 12. First bottom body; 13. Second bottom body; 14. Third bottom body; 21. First chamber; 22. Second chamber; 23. Third chamber; 31. First nozzle; 32. First discharge channel; 33. First inclined surface; 34. Plug head; 35. Second inclined surface; 36. Variable nozzle; 41. Second nozzle; 42. Second discharge channel; 43. Separation cylinder; 51. Coil group; 52. Controller; 53. Cable; 54. Displacement sensor; 61. Dynamic seal; 62. Constraint part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation on the present invention. The specific structural and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms and should not be construed as limited to the embodiments described herein.

[0028] As Figures 1-3 shown, a liquid rocket engine injector includes a top cover 11, a first bottom body 12, a second bottom body 13, a first nozzle 31, a bolt head 34, and a magnetic attraction assembly, wherein:

[0029] The top cover 11, the first bottom body 12, and the second bottom body 13 are arranged in sequence. According to the structural design of the engine, the top cover 11, the first bottom body 12, and the second bottom body 13 can also be fixedly connected respectively through fixed connection members or directly fixed by welding to maintain the stability of the relative position relationship. There is a first chamber 21 between the top cover 11 and the first bottom body 12, and a second chamber 22 between the first bottom body 12 and the second bottom body 13. The second chamber 22 can be filled with fuel or oxidant according to design requirements. Since one end of the first nozzle 31 extends into the first chamber 21 and can move in the first chamber 21, that is, the first chamber 21 serves as a containing working chamber to provide the space required for the movement of the first nozzle 31. Inert gas can be filled into the first chamber 21, thereby reducing the working pressure difference on both sides of the first bottom body 12, maintaining the sealing of the first chamber 21, and the structural stability when the first nozzle 31 repeatedly moves at the first chamber 21.

[0030] A plurality of first nozzles 31 having a first magnetic pole. The number of the first nozzles 31 is reasonably arranged according to the design parameters of the liquid rocket engine. Each of the first nozzles 31 penetrates through the first bottom body 12 and the second bottom body 13 respectively. There is a first discharge channel 32 communicating with the second chamber 22 between the first nozzle 31 and the second bottom body 13. Under the guidance of the first discharge channel 32, the fuel or oxidant in the second chamber 22 can be guided and ejected to the target area. The inner wall of the first discharge channel 32 far from the second chamber 22 is provided with a first inclined surface 33. That is, through the setting of the first inclined surface 33, the cross-sectional area of the first discharge channel 32 at the first inclined surface 33 gradually becomes larger, so that the fuel or oxidant entering the first discharge channel 32 from the second chamber 22 forms an expanding spray state, which is convenient for mixing and ignition combustion.

[0031] As Figure 2As shown, it should be noted that the arrangement form of the first nozzle 31 can be arranged in an array form according to the working needs. The specific spacing setting, circular array or rectangular array can be set according to the actual design needs, and there is no limitation here.

[0032] The plug head 34 is arranged at the end of the first nozzle 31, and there is a second inclined surface 35 on the outer side wall of the plug head 34. The plug head 34 moves synchronously under the drive of the displacement of the first nozzle 31, so as to change the relative distance between the second inclined surface 35 on the plug head 34 and the second inclined surface 35 on the first discharge channel 32.

[0033] The magnetic attraction assembly is arranged on the side of the top cover 11 away from the first bottom body 12, and the magnetic attraction assembly can drive the first nozzle 31 to move away from or close to the top cover 11, so as to increase or decrease the distance between the first inclined surface 33 and the second inclined surface 35.

[0034] It should be noted that the magnetic pole generated by the magnetic attraction assembly on one side of the top cover 11 can directly form a magnetic pole matching relationship with the first nozzle 31 on the other side of the top cover 11, so as to realize the relative displacement of the first nozzle 31 relative to the top cover 11.

[0035] Alternatively, the top cover 11 can be made of a material that can be magnetized by the magnetic attraction assembly. The top cover 11 is magnetized by the magnetic assembly, and the top cover 11 has the same or opposite magnetic pole as the first magnetic pole of the first nozzle 31. Then, according to the principle that like magnetic poles repel each other and unlike magnetic poles attract each other, the first nozzle 31 is driven to have a relative displacement relative to the top cover 11, further reducing the attraction requirement of the magnetic attraction assembly, avoiding the influence of the top cover 11 with a certain thickness on the magnitude of the magnetic attraction force when it is always between the magnetic attraction assembly and the first nozzle 31, and improving the stability.

[0036] The working principle of this embodiment is as follows: The top cover 11, the first bottom body 12, and the second bottom body 13 are arranged in sequence. A first chamber 21 is provided between the top cover 11 and the first bottom body 12, and a second chamber 22 is provided between the first bottom body 12 and the second bottom body 13. Multiple first nozzles 31 with first magnetic poles respectively penetrate through the first bottom body 12 and the second bottom body 13. A first discharge channel 32 between the first nozzle 31 and the second bottom body 13 is communicated with the second chamber 22. The inner wall of the first discharge channel 32 is provided with a first inclined surface 33, and the end of the first nozzle 31 is provided with a plug 34 having a second inclined surface 35 on the outer side wall. A magnetic attraction assembly is provided on the side of the top cover 11 away from the first bottom body 12. During the operation of this liquid rocket engine injector, by changing the magnetic pole state of the end of the magnetic attraction assembly close to the top cover 11, an attractive or repulsive effect is formed with the first nozzle 31 having the first magnetic pole, thereby driving the first nozzle 31 to move away from or close to the top cover 11. The distance between the first inclined surface 33 and the second inclined surface 35 is changed by the movement of the first nozzle 31, so as to control the ejecta in the second chamber 22 to be ejected from between the first inclined surface 33 and the second inclined surface 35 at different flow rates. At the same time, in cooperation with the change of the magnetic force of the magnetic attraction assembly, precise and rapid adjustment control of the throttle area of the injector is realized. The adjustment process is simple and efficient, and reliable adjustment operations can be carried out repeatedly under complex working conditions.

[0037] Further, on the basis of the above embodiment, the outer diameter of the end of the plug 34 away from the first nozzle 31 is larger than that of the other end, and the second inclined surface 35 is arranged parallel to the first inclined surface 33. Under the guiding action of the plug 34, fuel or catalyst can be ejected outward, improving the mixing and combustion effects. In addition, keeping the second inclined surface 35 parallel to the first inclined surface 33 can keep the area between the first inclined surface 33 and the second inclined surface 35 uniform after the fuel or catalyst enters the first discharge channel 32 from the second chamber 22, thereby maintaining the uniformity of the ejection of the fuel or catalyst and improving the stability.

[0038] In addition, it should be noted that the plug 34 is fixed at one end of the first nozzle 31. During the movement of the first nozzle 31, there is a relative interference in which the second inclined surface 35 on the plug 34 and the first inclined surface 33 move continuously in the direction of the top cover 11. That is to say, the setting that the outer diameter of the end of the plug 34 away from the first nozzle 31 is larger than that of the other end can prevent the first nozzle 31 from moving beyond the set stroke. On the one hand, it ensures the operation safety of the first nozzle 31, and on the other hand, when the first nozzle 31 moves towards the top cover 11, the first discharge channel 32 can be kept closed through the fitting relationship between the second inclined surface 35 and the first inclined surface 33, maintaining the flexibility of the operation.

[0039] Further, on the basis of the above embodiments, a variable nozzle 36 is formed between the first inclined surface 33 and the second inclined surface 35, and the cross-sectional area of the variable nozzle 36 is not greater than the cross-sectional area of the first discharge channel 32. The cross-sectional area of the variable nozzle 36 is continuously changed driven by the displacement of the first nozzle 31, that is, the flow rate at the variable nozzle 36 can be adjusted in real time by the displacement of the first nozzle 31. In addition, the cross-sectional area of the first discharge channel 32 is stable and unchanged. By restricting the cross-sectional area of the variable nozzle 36 to be not greater than the cross-sectional area of the first discharge channel 32, it is ensured that the flow rate and the spraying effect at the variable nozzle 36 meet the design requirements.

[0040] Further, on the basis of the above embodiments, a third bottom body 14 is provided on the side of the second bottom body 13 away from the first bottom body 12, and a third chamber 23 is provided between the third bottom body 14 and the second bottom body 13. The first nozzle 31 penetrates to the side of the third bottom body 14 away from the second bottom body 13. Among them, the third chamber 23 cooperates with the second chamber 22 and is respectively used for accommodating fuel or catalyst. After being separated and guided by the first nozzle 31, the fuel and the catalyst can be sprayed to the side of the third bottom body 14 away from the second bottom body 13 for mixing.

[0041] Further, on the basis of the above embodiments, a second nozzle 41 is provided on the third bottom body 14. The second nozzle 41 is coaxially arranged with the first nozzle 31, and a second discharge channel 42 communicating with the third chamber 23 is formed in the second nozzle 41. After being separated and guided by the first nozzle 31 as described above, the fuel and the catalyst are respectively sprayed for mixing. In order to further maintain the spraying stability, since the first nozzle 31 needs to be reciprocally adjusted in displacement according to the operation or flight requirements, the second nozzle 41 provided on the third bottom body 14 is sleeved outside the first nozzle 31 to smoothly restrict and guide the fuel or catalyst in the third chamber 23 to the discharge port of the first discharge channel 32, thereby improving the stability of the working process.

[0042] Further, on the basis of the above embodiments, a separating cylinder 43 is provided on the second bottom body 13. The separating cylinder 43 is coaxially arranged with the first nozzle 31. One ends of the separating cylinder 43, the first nozzle 31, and the second nozzle 41 away from the top cover 11 are flush. The first discharge channel 32 is located inside the separating cylinder 43, and the second discharge channel 42 is located outside the separating cylinder 43. The first discharge channel 32 and the second discharge channel 42 are kept flush at the end or indented by a certain distance, ensuring the maximum mixing of fuel or catalyst, and making the combustion state of the mixture more controllable. The setting of the separating cylinder 43 can reduce the structural complexity of the second bottom body 13, avoid directly forming the separation of the first discharge channel 32 and the second discharge channel 42 through the second bottom body 13, and reduce the assembly difficulty and the assembly difficulty.

[0043] Under the action of the separating cylinder 43, the first nozzle 31 always axially reciprocates in the separating cylinder 43 while maintaining a distance from the separating cylinder 43. The space formed between the outer wall of the first nozzle 31 and the inner wall of the separating cylinder 43 is the first discharge channel 32 communicating with the second chamber 22. At the same time, the space formed between the outer wall of the separating cylinder 43 and the third bottom body 14 is the second discharge channel 42 communicating with the third chamber 23. And the aforementioned first inclined surface 33 is the first inclined surface 33 provided on the separating cylinder 43. It should be noted that if a second nozzle 41 is provided on the third bottom body 14, then the second discharge channel 42 is the space formed between the outer wall of the separating cylinder 43 and the inner wall of the second nozzle 41. The spatial arrangement is more reasonable and stable, and the relative positions of the second bottom body 13, the separating cylinder 43, the third bottom body 14, and the second nozzle 41 are all kept stable.

[0044] As Figure 1 shown, further, on the basis of the above embodiments, the magnetic attraction assembly includes a coil group 51 for energization. The coil group 51 is connected by a cable 53 to a controller 52 for changing the direction and magnitude of the current on the coil group 51. The magnetic attraction assembly is specifically set as the coil group 51 that can be energized to generate a magnetic field. After the controller 52 is operated to energize the coil group 51, a circular magnetic field is generated in the surrounding space of the coil group 51, and the N pole or S pole is kept facing the first nozzle 31 through the setting of the position and direction of the coil group 51. One end of the first nozzle 31 has a first magnetic pole that is one of the N pole or S pole, so as to attract or push the first nozzle 31 to move. According to the adjustment needs, the direction of the current passing through the coil group 51 can be changed by the controller 52, and then the N pole or S pole is switched to complete the switching of the attraction or pushing state of the first nozzle 31. Figure 1 As shown in [the figure], the first magnetic pole at one end of the first nozzle 31 close to the top cover 11 is the N pole, and the magnetic pole of the control coil group 51 is also in the N pole state.

[0045] In addition, according to the adjustment requirements, the controller 52 can also be used to adjust the magnitude of the current in the coil group 51, thereby changing the magnetic field strength, so as to maintain a larger and more stable magnetic attraction drive during operation and ensure a stable displacement of the first nozzle 31.

[0046] Furthermore, based on the above embodiment, a displacement sensor 54 for obtaining the displacement of the first nozzle 31 is provided on one side of the top cover 11 close to the first chamber 21. During the process of driving the first nozzle 31 to approach or move away from the top cover 11, in order to further determine the accuracy of the distance between the first inclined surface 33 and the second inclined surface 35, after the magnetic attraction assembly drives the first nozzle 31 to make a displacement of a set distance, the relative displacement of the first nozzle 31 can be obtained through the displacement sensor 54 and then compared with the designed displacement. If the error value of the displacement is within the allowable range, the operation state can be maintained. If it exceeds the error setting range, maintenance and calibration operations are required to improve the stability of subsequent operations.

[0047] Furthermore, based on the above embodiment, a dynamic seal 61 is provided on the outer wall of the first nozzle 31. The dynamic seal 61 is located between the first nozzle 31 and the first bottom body 12. The dynamic seal 61 can be a sealing rubber ring and is displaced synchronously with the first nozzle 31. It is always abutted against the first bottom body 12 to maintain the sealing of the first chamber 21 and prevent the inert gas from mixing with the gas in other chambers.

[0048] Furthermore, based on the above embodiment, a restraint portion 62 for restricting the separation of the first nozzle 31 from the first bottom body 12 is provided on the first nozzle 31. By restricting the moving stroke of the first nozzle 31, the restraint portion 62 prevents the first nozzle 31 from directly detaching from the first bottom body 12 under the driving action of the magnetic attraction assembly, improves the reliability of the repeated displacement of the first nozzle 31, and enhances flight safety.

[0049] It should be understood that terms such as first and second are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance. Although terms such as first and second etc. can be used in this article to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, the first unit can be called the second unit, and similarly, the second unit can be called the first unit, without departing from the scope of the exemplary embodiments of the present invention.

[0050] It should be understood that the term "and / or" in this text is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, B exists alone, and both A and B exist simultaneously. The term " / and" in this text describes another relationship between associated objects, indicating that two relationships can exist. For example, A / and B can represent two situations: A exists alone, and both A and B exist. Additionally, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0051] It should be understood that in the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "vertical", "inner", "outer", etc. is the orientation or positional relationship in which the disclosed product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0052] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0053] The terms used in this text are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprise", "comprises", "include", and / or "includes" when used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, and do not preclude the presence or addition of one or more other features, quantities, steps, operations, units, components, and / or their combinations.

[0054] Specific details are provided in the following description to facilitate a complete understanding of the exemplary embodiments. However, those of ordinary skill in the art should understand that the exemplary embodiments can be implemented without these specific details. In other embodiments, well-known processes, structures, and technologies may not be shown in unnecessary detail to avoid obscuring the exemplary embodiments.

[0055] The above are only specific implementation manners of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will conform to the widest scope consistent with the principles and novel features claimed herein.

[0056] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art.

Claims

1. A liquid rocket engine injector, characterized in that, It includes: A top cover, a first bottom body, and a second bottom body arranged in sequence. There is a first chamber between the top cover and the first bottom body, and a second chamber between the first bottom body and the second bottom body; Multiple first nozzles having a first magnetic pole. The multiple first nozzles respectively penetrate through the first bottom body and the second bottom body. There is a first discharge channel communicating with the second chamber between the first nozzle and the second bottom body. The inner wall of the second bottom body away from the second chamber is provided with a first inclined surface; A bolt head, which is arranged at the end of the first nozzle, and a second inclined surface is provided on the outer side wall of the bolt head; A magnetic attraction assembly, which is arranged on the side of the top cover away from the first bottom body, and the magnetic attraction assembly can drive the first nozzle to move away from or close to the top cover to increase or decrease the distance between the first inclined surface and the second inclined surface.

2. The injector of a liquid rocket engine according to claim 1, characterized in that: The outer diameter of one end of the bolt head away from the first nozzle is greater than that of the other end, and the second inclined surface is arranged parallel to the first inclined surface.

3. The liquid rocket engine injector according to claim 1, characterized in that: A variable nozzle is formed between the first inclined surface and the second inclined surface, and the cross-sectional area of the variable nozzle is not greater than the cross-sectional area of the first discharge channel.

4. The injector of the liquid rocket engine according to claim 1, characterized in that: A third bottom body is provided on the side of the second bottom body away from the first bottom body, and a third chamber is provided between the third bottom body and the second bottom body. The first nozzle penetrates to the side of the third bottom body away from the second bottom body.

5. The injector of the liquid rocket engine according to claim 4, wherein: A second nozzle is provided on the third bottom body. The second nozzle is coaxially arranged with the first nozzle, and a second discharge channel communicating with the third chamber is formed in the second nozzle.

6. The injector of the liquid rocket engine according to claim 5, characterized in that: A partition cylinder is provided on the second bottom body. The partition cylinder is coaxially arranged with the first nozzle. The ends of the partition cylinder, the first nozzle, and the second nozzle away from the top cover are flush or indented. The first discharge channel is located inside the partition cylinder, and the second discharge channel is located outside the partition cylinder.

7. The injector of the liquid rocket engine according to claim 1, characterized in that: The magnetic attraction assembly includes a coil group for energization. The coil group is connected by a cable to a controller for changing the direction and magnitude of the current on the coil group.

8. The injector of a liquid rocket engine according to claim 1, characterized in that: A displacement sensor for obtaining the displacement of the first nozzle is provided on the side of the top cover close to the first chamber.

9. The injector of the liquid rocket engine according to claim 1, wherein: A dynamic seal is provided on the outer wall of the first nozzle, and the dynamic seal is located between the first nozzle and the first bottom body.

10. The liquid rocket engine injector according to claim 1, characterized in that: A constraint portion for restricting the separation of the first nozzle from the first bottom body is provided on the first nozzle.

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