Double-adjustment pintle type injector and thrust chamber

Abstract

According to the double-adjustment pintle type injector and the thrust chamber, the sleeve is driven to move through air control, the axial position of the sleeve is changed under the action of the pressure difference between the air pressure and the spring force, and therefore the opening degree and the injection area of the first flow channel and the second flow channel are adjusted synchronously, and the injection efficiency is improved. And the flow of the first propellant and the flow of the second propellant are adjusted. According to the double-adjustment pintle type injector, the flow of the propellant can be adjusted in real time by moving the pintle, so that the thrust of an engine is flexibly adjusted, the requirements of different task stages are met, the combustion efficiency is improved, and waste of the propellant is avoided.

Description

Technical Field

[0001] This utility model relates to the field of aerospace launch vehicle engine technology, and in particular to a dual-adjustment needle-type injector and thrust chamber. Background Technology

[0002] The injector is a crucial component of a liquid rocket engine, significantly impacting propellant atomization and combustion as well as engine performance. Currently, the aerospace industry has a strong demand for thrust technologies that can operate under a wide range of varying conditions, are reusable, and are cost-effective. However, traditional injection methods suffer from limitations in structural complexity, combustion stability, and cost control. Therefore, there is an urgent need to further improve existing needle-plug injection technology. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model proposes a dual-adjustment needle-type injector and thrust chamber, which further simplifies the entire engine system and reduces weight and manufacturing costs.

[0004] This utility model provides a dual-adjustment needle-type injector, comprising at least: a body shell, a central cylinder, a sleeve, and a central rod; the body shell has a first inlet on one side in its axial direction, and the central cylinder is fixedly disposed in the inner cavity on the other side; the sleeve is at least partially located between the body shell and the central cylinder, and is movable along the axial direction of the body shell; the small-diameter section of the central rod is located inside the central cylinder, and the large-diameter section is located inside the sleeve; the outer wall of the small-diameter section of the central rod and the inner wall of the central cylinder are spaced apart to form a flow guiding channel, and the central cylinder has a second inlet communicating with the flow guiding channel; a compressed elastic element is provided between the side of the sleeve near the second inlet and the central cylinder, and the other side of the sleeve away from the second inlet... The outer wall and the inner wall of the body shell are at least partially engaged and limited to form a first flow channel. The inner wall on the other side is at least partially engaged and limited to form a second flow channel. The end of the sleeve away from the second inlet is provided with a spray nozzle. The elastic element is used to provide elastic force to the sleeve away from the second inlet, so that the first flow channel and the second flow channel are closed. By controlling the sleeve with external force to overcome the elastic force of the elastic element and move it toward the second inlet, the first flow channel and the second flow channel are opened at the same time. The first propellant enters the first flow channel through the first inlet and is ejected from the first flow channel. The second propellant enters the second flow channel through the second inlet and the guide channel in sequence and is ejected from the spray nozzle.

[0005] In one embodiment, the spray nozzle includes a plurality of alternating main spray nozzles and a plurality of auxiliary spray nozzles, wherein the size of the main spray nozzles is larger than the size of the auxiliary spray nozzles.

[0006] In one embodiment, the elastic element includes a first spring and a second spring; a first cavity is formed between the body housing, the sleeve, and the central cylinder, and the first elastic element is located within the first cavity; a sleeve cap is provided at the end of the sleeve away from the second inlet, and the second spring is disposed between the end of the large-diameter section of the central rod and the sleeve cap; the first spring and the second spring simultaneously provide elastic force to the sleeve away from the second inlet.

[0007] In one embodiment, the body housing is provided with a first connecting nozzle communicating with the first cavity; between the first cavity and the first inlet, the outer wall of the sleeve and the inner wall of the body housing are at least partially spaced to form a second cavity, the second cavity communicating with a second connecting nozzle disposed on the body housing;

[0008] Air is supplied to the second cavity through the second connector, and the air pressure pushes the sleeve to overcome the elastic force of the first spring and the second spring, causing it to move towards the second inlet, thereby opening the first flow channel and the second flow channel; air is supplied to the first cavity through the first connector, which can drive the sleeve to move away from the second inlet.

[0009] In one embodiment, the sleeve is provided with a first outer conical surface, and the body housing is provided with a first inner conical surface that mates with the first outer conical surface. The first outer conical surface and the first inner conical surface mate to form the first flow channel.

[0010] In one embodiment, the sleeve is provided with a second inner conical surface, and the large-diameter section of the central rod is provided with a second outer conical surface that matches the second inner conical surface. The second outer conical surface and the second inner conical surface cooperate to form the second flow channel.

[0011] In one embodiment, a first sealing pair is provided between the first outer conical surface and the first inner conical surface; a second sealing pair is provided between the second outer conical surface and the second inner conical surface.

[0012] In one embodiment, a first seal is provided between the first cavity and the second cavity; a second seal is provided between the second cavity and the first flow channel.

[0013] In any of the above embodiments, the external force driving the sleeve to move can be generated by motor drive, hydraulic drive or pneumatic drive.

[0014] In another aspect, this utility model provides a thrust chamber, which includes at least the dual-adjustment needle-type injector in any of the above embodiments.

[0015] The present invention provides a dual-adjustment needle-type injector and thrust chamber, which has at least one of the following beneficial effects:

[0016] I. This utility model employs a non-metallic and metallic sealing pair combination and utilizes spring force to achieve effective sealing after the two media channels are closed. The adjustment surfaces of both media flow channels in this utility model are inclined planes, ensuring linear changes in flow resistance during adjustment. This utility model uses a pneumatic control method for rapid actuator response.

[0017] Second, the needle-type injector provided by this utility model has a greatly simplified structure, improved reliability, and reduced weight and manufacturing cost.

[0018] Third, this utility model adjusts the flow area of ​​the two medium channels synchronously by moving the sleeve, thereby realizing thrust adjustment and engine shutdown function. It can replace the fuel / oxygen auxiliary valve and further simplify the entire engine system.

[0019] IV. The needle-type injector of this invention achieves thorough mixing and complete combustion of the two propellants, exhibiting good combustion stability and high combustion efficiency. During combustion, its pulsation and vibration amplitude are extremely small, a characteristic that greatly reduces the risk of damage caused by combustion instability.

[0020] Upon reading the detailed embodiments and examining the accompanying drawings, those skilled in the art will recognize additional features and advantages. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments 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.

[0022] Figure 1 This is a schematic diagram of the overall structure of the dual-adjustment needle-type injector in the closed state according to an embodiment of this utility model.

[0023] Figure 2 This is a schematic diagram of the overall structure of the dual-adjustment needle-type injector in its working state according to an embodiment of this utility model.

[0024] Figure 3 This is a top view and a partial enlarged view of the dual-adjustment needle-type injector according to an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the first structure of the spray nozzle according to an embodiment of the present utility model.

[0026] Figure 5 This is a schematic diagram of the second structure of the spray nozzle according to an embodiment of the present invention.

[0027] Figure 6 This is a schematic diagram of the external appearance of the dual-adjustment needle-type injector according to an embodiment of the present invention. Detailed Implementation

[0028] The features and exemplary embodiments of various aspects of this utility model will be described in detail below. To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this utility model and to exemplarily illustrate the principles of this utility model, and are not configured to limit this utility model. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the dimensions of some structural components or regions in the drawings may be enlarged for other structural components or regions to aid in the understanding of the embodiments of this utility model.

[0029] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of this utility model. In the description of this utility model, it should be noted that, unless otherwise stated, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Furthermore, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure or component that includes a list of elements includes not only those elements but also other structural elements that are not expressly listed or inherent to the structure or component. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes the element.

[0031] Spatial relation terms such as "below," "under," "under," "low," "above," "on," and "high" are used for descriptive convenience to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device, in addition to those different from those shown in the figure. Furthermore, phrases such as "one element on / below another element" can indicate that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first" and "second" are also used to describe individual elements, areas, parts, etc., and should not be considered limiting. Similar terms are used throughout the description to refer to similar elements.

[0032] For those skilled in the art, this invention can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples.

[0033] This utility model provides a dual-adjustment needle-type injector, which can be used for flow control and injection of propellants such as liquid oxygen / liquid methane, liquid oxygen / gasmethane, and kerosene / liquid oxygen. During operation, the injector can synchronously adjust the flow rates of the first and second propellants according to actual needs, thereby flexibly adjusting the engine thrust to adapt to the needs of different mission stages, improving combustion efficiency while avoiding propellant waste.

[0034] See Figure 1 and Figure 2 This utility model provides a dual-adjustment needle-type injector, comprising at least: a body shell 1, a central cylinder 2, a sleeve 3, and a central rod 4. The body shell 1 has a first inlet 11 on one side in the axial direction, and the central cylinder 2 is fixedly mounted in the inner cavity on the other side of the body shell 1. The sleeve 3 is at least partially located between the body shell 1 and the central cylinder 2, and is movable along the axial direction of the body shell 1. The small-diameter section 41 of the central rod 4 is located inside the central cylinder 2, and the large-diameter section 42 is located inside the sleeve 3. The outer wall of the small-diameter section 41 of the central rod 4 is spaced apart from the inner wall of the central cylinder 2 to form a flow guide channel A. The central cylinder 2 has a second inlet 21 communicating with the flow guide channel A.

[0035] The central cylinder 2 includes at least a first portion that is sealed to the other end of the body housing 1, and a second portion that extends into the inner cavity of the body housing 1. A second inlet 21 is disposed in the first portion of the central cylinder 2. The inner wall of the second portion of the central cylinder 2 and the outer wall of the small-diameter section 41 are spaced apart to form a flow guide channel A. The outer wall of the second portion of the central cylinder 2 abuts against the sleeve 3. In addition, the end of the second portion of the central cylinder 2 away from the second inlet is used to cooperate with a portion of the inner wall of the sleeve 3 to limit the maximum distance that the sleeve 3 can move toward the second inlet 21, thereby limiting the maximum opening of the injector.

[0036] In this embodiment, the sleeve 3 presses the elastic element against the first part of the central cylinder 2 on the side near the second inlet 21. The outer wall of the other side is at least partially engaged with the inner wall of the body shell 1 to form a first flow channel 5. The inner wall of the other side is at least partially engaged with the large diameter section 42 of the central rod to form a second flow channel 6. The end of the sleeve 3 away from the second inlet 21 is provided with a spray nozzle 33.

[0037] In this embodiment, an inner boss 34 can be provided in the inner cavity of the sleeve 3. The inner boss 34 and the large diameter section 42 of the central rod are at least partially engaged and limited to form a second flow channel 6.

[0038] In other words, the inner boss 34 located within the cavity of the sleeve 3 is an annular boss. Its axial side, closer to the second inlet 21, is used to engage and limit the second part of the central cylinder 2, while its side, farther from the second inlet 21, is used to engage with the large-diameter section 42 of the central rod to form the second flow channel 6. That is... Figure 1 As shown, sleeve 3 is axially oriented in one direction ( Figure 1 When the sleeve 3 moves to its maximum distance in the upward direction, it is limited by the inner boss 34 near the second inlet 21 and the end of the central sleeve. At this time, the second flow channel 6 opens to its maximum; the sleeve 3 moves axially in another direction ( Figure 1 When the flow reaches its maximum distance in the downward direction, it engages with the large-diameter section 42 of the center rod 4, and the second flow channel 6 is closed.

[0039] In this embodiment, the dual-adjustment needle-type injector utilizes an elastic element to provide an elastic force to the sleeve 3 in a direction away from the second inlet 21, thereby closing the first flow channel 5 and the second flow channel 6 (e.g., Figure 1 (As shown). When the sleeve 3 is moved towards the second inlet 21 by external force to overcome the elastic force of the elastic element, the first flow channel 5 and the second flow channel 6 can be opened simultaneously (as shown). Figure 2 As shown), the first propellant enters the first flow channel 5 through the first inlet 11 and is ejected from the first flow channel 5. The second propellant enters the second flow channel 6 after passing through the second inlet 21 and the guide channel A in sequence and is ejected from the injection port 33. Figure 2 The dashed arrows in the diagram indicate the flow direction of the two propellants. (For example...) Figure 2 As shown, the first propellant is injected axially and the second propellant is injected radially. After the two propellants are ejected, they collide and break apart, which helps to fully mix the fuel and oxidizer, thereby improving combustion efficiency and stability.

[0040] In this embodiment, the external force driving the sleeve to move can be generated by a motor, hydraulic control, or pneumatic drive.

[0041] The dual-adjustment needle-bolt injector of this embodiment changes the axial position of the sleeve under the pressure difference between an external force (which can refer to the driving force alone or include the fluid force of the propellant) and a spring force. This simultaneously adjusts the opening of the first and second flow channels and the injection area, thereby regulating the flow rates of the first and second propellants. The dual-adjustment needle-bolt injector of this embodiment can adjust the opening of the two flow channels according to the injection pressure requirements, thus flexibly adjusting the engine thrust to adapt to the needs of different mission phases, improving combustion efficiency, and avoiding propellant waste.

[0042] See also Figure 1 , Figure 2 and Figure 3In the above embodiment, the inner wall of the central cylinder 2 is provided with a flow guiding unit 22. The flow guiding unit 22 includes an annular structure 221 and a flow guiding plate 222 connecting the outer wall of the annular structure 221 and the inner wall of the central cylinder 2. A flow guiding channel B is formed between adjacent flow guiding plates, and the second inlet 21 is connected to the flow guiding channel A through the flow guiding channel B. In addition, the small-diameter section 41 of the central rod is located inside the ring of the annular structure 221.

[0043] In one embodiment, to facilitate the installation of the injector, the sleeve can be disassembled into two parts. For example, the sleeve 3 includes at least a sleeve body 31 and a sleeve cap 32. The sleeve cap 32 is located at the end of the sleeve body 31 away from the second inlet 21, and the injection nozzles 33 are evenly distributed around the sleeve cap 32. With this arrangement, the center rod and elastic element can be assembled first, and then the sleeve and sleeve end cap can be welded.

[0044] See also Figure 1 and Figure 4 Furthermore, to improve combustion efficiency, the injection port 33 (the outlet of the second propellant) can be designed with a paired injection method consisting of main and auxiliary channels. For example, the injection port 33 includes multiple alternating main injection ports 331 and multiple auxiliary injection ports 332. The main injection ports 331 have a T-shaped cross-section, while the auxiliary injection ports 332 have a near-circular cross-section. The size of the main injection ports 331 is larger than that of the auxiliary injection ports 332.

[0045] Furthermore, to improve atomization efficiency and combustion stability, spiral grooves can be provided on the inner wall of the secondary nozzle 332. This allows a portion of the second propellant to swirl through the spiral grooves before being radially ejected, thereby enhancing the atomization effect after impact. Alternatively, the spiral grooves within two adjacent secondary nozzles 332 can be designed with opposite spiral directions, causing the rotating fluid ejected from adjacent secondary nozzles 332 to generate axial vortices in opposite directions, creating a controllable flow field superposition effect in the confluence region. Specifically, when the second propellant passes through the spiral grooves, the right-handed vortex generated by the preceding nozzle and the left-handed vortex of the subsequent nozzle will partially cancel out the tangential velocity components in the mixing region. Although this reduces turbulence intensity, it enhances axial diffusion capability, improves the mixing degree of the two propellants, and increases combustion efficiency. Experiments have shown that compared to the traditional co-directional spiral structure, this design can reduce the standard deviation of atomized particle size distribution by 18.7% while improving the axial extension uniformity of the liquid film by 23.4%.

[0046] See Figure 5 In the above embodiment, the large inner diameter portion of the T-shaped main nozzle is located in Figure 5 The upper boundary, the small inner diameter part is located at Figure 5 To further enhance the axial diffusion capability of the second propellant, the sub-injector nozzles can be staggered at the lower boundary. For example, the first sub-injector nozzle 332a is close to... Figure 5The upper boundary setting, the second auxiliary spray nozzle 332b is close to Figure 5 The lower boundary setting, the third sub-spray nozzle 332c is close to Figure 5 The upper boundary setting places the fourth auxiliary spray nozzle (not marked in the diagram) close to... Figure 5 The lower boundary setting, and so on.

[0047] See also Figure 1 , Figure 2 and Figure 3 In one embodiment, the elastic element includes a first spring 71 and a second spring 72. A first cavity 100 is formed between the body housing 1, the sleeve body 31, and the central cylinder 2. The first elastic element 71 is located within the first cavity 100, and the second spring 72 is disposed between the large-diameter end 42 of the central rod 4 and the sleeve cap 32. The first spring 71 and the second spring 72 simultaneously provide elastic force to the sleeve 3 in a direction away from the second inlet 21, thereby improving the sealing performance of the sealing surfaces of the first flow channel 5 and the second flow channel 6 in the injector-closed state, making the sealing performance better and more reliable.

[0048] Furthermore, to ensure reliable sealing of the sealing surfaces of the first and second flow channels when the injector is closed, a first sealing pair 8 can be provided on the sealing surface of the first flow channel, and a second sealing pair 9 can be provided on the sealing surface of the second flow channel. For example, a first outer conical surface can be provided on the outer wall of the sleeve 3, and a first inner conical surface that mates with the first outer conical surface can be provided on the inner wall of the body shell 1. The first outer conical surface and the first inner conical surface mate to form the first flow channel 5. The side of the inner boss 34 of the sleeve 3 away from the second inlet 21 can be provided as the second inner conical surface, and a second outer conical surface that matches the second inner conical surface can be provided on the large-diameter section 42 of the central rod. The second outer conical surface and the second inner conical surface mate to form the second flow channel 6. Among them, a first sealing pair 8 is provided between the first outer conical surface and the first inner conical surface, and a second sealing pair 9 is provided between the second outer conical surface and the second inner conical surface.

[0049] In this embodiment, both the first sealing pair and the second sealing pair are composed of a metal matrix and non-metallic materials. The non-metallic materials are elastic and can fill microscopic uneven surfaces to achieve a tight seal, while the metal materials provide rigid support to ensure structural stability.

[0050] The dual-adjustment needle-type injector of this embodiment uses a sloping conical surface design to form two propellant channels, so that the product opening and flow rate are linear or equal percentage, which facilitates precise control of the flow rate of the two propellants.

[0051] In this embodiment, the body shell 1 is a regenerative cooling structure, and the first propellant enters through the first inlet and then enters the liquid collection chamber.

[0052] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 In any of the above embodiments, the sleeve can be pneumatically driven to move axially. Specifically, the body housing 1 is provided with a first connector 13 communicating with the first cavity 100, which can be used to introduce gas into the first cavity 100. Between the first cavity 100 and the first inlet 11, a second cavity 200 is formed by at least a partial gap between the outer wall of the sleeve body 31 and the inner wall of the body housing 1, and the second cavity 200 communicates with the second connector 14 provided on the body housing 1.

[0053] In this embodiment, when the injector is working, air is introduced into the second cavity 200 through the second connector 14. The air pressure in the second cavity 200 pushes the sleeve 3 to overcome the elastic force of the first spring 71 and the second spring 72, causing it to move towards the second inlet 21. Both the first spring 71 and the second spring 72 are in a compressed state, thereby opening the gap between the sleeve and the conical surface of the body shell (first flow channel 5) and the gap between the sleeve and the conical surface of the center rod (second flow channel 6). The first propellant enters the collecting ring and is injected axially along the ring gap after passing through the first flow channel 5; the second propellant flows through the guide channels B and C and is injected radially from the injection port 33 of the sleeve cover after passing through the second flow channel 6. The flow paths of the two propellants can be referenced. Figure 2 The direction indicated by the dashed arrow.

[0054] When the injector is closed, air is supplied to the first cavity 100 through the first connector 13, driving the sleeve 3 to move away from the second inlet 21. During operation, the moving distance of the sleeve can be controlled by jointly adjusting the pressure of the two air sources, thereby changing the flow area of ​​the first and second flow channels, and thus adjusting the propellant injection pressure drop, injection film thickness, and injection speed.

[0055] See also Figure 1 and Figure 2 In any of the above embodiments, a spring-storage sealing ring 301 and a spring-storage sealing ring 302 can be disposed between the first cavity 100 and the second cavity 200. The spring-storage sealing ring 301 is installed between the outer wall of the sleeve body 31 and the body shell 1, and the spring-storage sealing ring 302 is installed between the inner wall of the sleeve body 31 and the central cylinder 2. The spring-storage sealing ring 302 can prevent gas from the first cavity 100 from leaking into the second flow channel 6, and the spring-storage sealing ring 301 can prevent gas from the first cavity 100 from leaking into the second cavity 200. Further, in order to prevent the spring-storage sealing rings 301 and 302 from coming off during dynamic movement, a baffle 304 can be fixedly disposed at the end of the sleeve body 31 near the first elastic member 71. One axial end of the baffle 304 is used to limit the position of the spring-storage sealing rings 301 and 302, and the other end is used to constrain the first elastic member 71.

[0056] In addition, to prevent gas from leaking from the second cavity 200 into the first flow channel 5, a spring-loaded sealing ring 303 can be installed between the second cavity 200 and the first flow channel 5. The spring-loaded sealing ring 303 is installed between the inner wall of the body shell 1 and the outer wall of the sleeve body 31. To prevent the spring-loaded sealing ring 303 from coming out of the mounting groove during dynamic movement, a baffle 305 can be used to constrain the spring-loaded sealing ring 303. The baffle 305 is installed on the outer wall of the sleeve with screws, which can effectively prevent the spring-loaded sealing ring 303 from coming out of the mounting groove during dynamic movement, thus avoiding affecting the sealing effect.

[0057] In any of the above embodiments, a seal is provided at the connection between the body shell and the central cylinder.

[0058] The above embodiments can be combined with each other and have corresponding technical effects.

[0059] This utility model also provides a thrust chamber, which includes at least the dual-adjustment needle-type injector in any of the above embodiments.

[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-adjustment needle-type injector, characterized in that, It includes at least: body shell, central cylinder, sleeve and central rod; The body shell has a first inlet on one side in the axial direction, and the inner cavity on the other side is used to fix the central cylinder; the sleeve is at least partially located between the body shell and the central cylinder, and can move along the axial direction of the body shell; the small-diameter section of the central rod is located inside the central cylinder, and the large-diameter section is located inside the sleeve; the outer wall of the small-diameter section of the central rod and the inner wall of the central cylinder are spaced apart to form a flow channel, and the central cylinder has a second inlet communicating with the flow channel; A compressible elastic element is provided between the side of the sleeve near the second inlet and the central cylinder. The outer wall of the other side of the sleeve away from the second inlet is at least partially engaged with the inner wall of the body housing to form a first flow channel. The inner wall of the other side is at least partially engaged with the large-diameter section of the central rod to form a second flow channel. A liquid spray nozzle is provided at the end of the sleeve away from the second inlet. The elastic element is used to provide an elastic force to the sleeve away from the second inlet direction, so as to close the first flow channel and the second flow channel; The sleeve is controlled by external force to overcome the elastic force of the elastic element and move toward the second inlet, so that the first flow channel and the second flow channel are opened at the same time. The first propellant enters the first flow channel through the first inlet and is ejected from the first flow channel. The second propellant enters the second flow channel through the second inlet and the guide channel in sequence and is ejected from the spray nozzle.

2. The dual-adjustment needle-type injector according to claim 1, characterized in that, The spray nozzle includes multiple main spray nozzles and multiple auxiliary spray nozzles arranged alternately, and the size of the main spray nozzles is larger than the size of the auxiliary spray nozzles.

3. The dual-adjustment needle-type injector according to claim 2, characterized in that, The elastic element includes a first spring and a second spring; a first cavity is formed between the body housing, the sleeve and the central cylinder, and the first elastic element is located in the first cavity; The sleeve is provided with a sleeve cap at the end away from the second inlet, and the second spring is disposed between the end of the large diameter section of the central rod and the sleeve cap; The first spring and the second spring simultaneously provide the sleeve with a spring force away from the second inlet direction.

4. The dual-adjustment needle-type injector according to claim 3, characterized in that, The body housing is provided with a first connecting nozzle communicating with the first cavity; between the first cavity and the first inlet, the outer wall of the sleeve and the inner wall of the body housing are at least partially spaced to form a second cavity, the second cavity communicating with the second connecting nozzle provided in the body housing; Air is introduced into the second cavity through the second connector, and the air pressure pushes the sleeve to overcome the elastic force of the first spring and the second spring, causing it to move towards the second inlet, thereby opening the first flow channel and the second flow channel; By supplying air to the first cavity through the first connector, the sleeve can be driven to move away from the second inlet.

5. The dual-adjustment needle-type injector according to claim 1, characterized in that, The sleeve is provided with a first outer conical surface, and the body shell is provided with a first inner conical surface that mates with the first outer conical surface. The first outer conical surface and the first inner conical surface mate to form the first flow channel.

6. The dual-adjustment needle-type injector according to claim 5, characterized in that, The sleeve is provided with a second inner conical surface, and the large-diameter section of the central rod is provided with a second outer conical surface that matches the second inner conical surface. The second outer conical surface and the second inner conical surface cooperate to form the second flow channel.

7. The dual-adjustment needle-type injector according to claim 6, characterized in that, A first sealing pair is provided between the first outer conical surface and the first inner conical surface; a second sealing pair is provided between the second outer conical surface and the second inner conical surface.

8. The dual-adjustment needle-type injector according to claim 5, characterized in that, A first seal is provided between the first cavity and the second cavity; a second seal is provided between the second cavity and the first flow channel.

9. The dual-adjustment needle-type injector according to claim 1, characterized in that, The external force driving the sleeve to move can be generated by motor drive, hydraulic drive or pneumatic drive.

10. A thrust chamber, characterized in that, It includes at least the dual-adjustment needle-type injector as described in any one of claims 1 to 9.

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