Needle bolt injector

Abstract

The pintle injector comprises a shell, a pintle assembly, a sliding sleeve assembly and an adjusting assembly, and the shell is provided with a mounting channel; the pintle assembly is arranged in the mounting channel, a first flow channel is formed in the pintle assembly, and a first injection opening communicating with the first flow channel is formed in the periphery of one end of the pintle assembly; the periphery of the pintle assembly is movably sleeved with the sliding sleeve assembly in the axial direction of the pintle assembly, the sliding sleeve assembly is used for adjusting opening and closing of the first injection opening, a second flow channel is formed between the sliding sleeve assembly and the side wall of the mounting channel, and the end, facing the first injection opening, of the second flow channel is open to form a second injection opening; the adjusting assembly is arranged in the second flow channel and used for adjusting the flow of the second flow channel. Through cooperative use of the sliding sleeve assembly and the adjusting assembly, the flow in the first flow channel and the flow in the second flow channel can be adjusted at the same time, so that any mixing ratio of fuel and an oxidizing agent is achieved, and then stable control over the pressure of the combustion chamber is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of injectors, and particularly to a pintle injector. Background Art

[0002] The thrust control of a variable-thrust liquid rocket engine is achieved by controlling the liquid flow rate. To achieve the best liquid spray effect, when selecting an injector for a variable-thrust liquid rocket engine, a pintle injector is generally selected. The pintle injector can adjust the engine thrust by adjusting the opening of its pintle. At the same time, it has high-efficiency combustion organization performance and inherent combustion stability, so it has a very broad application prospect in variable-thrust liquid rocket engines.

[0003] Patent CN112431693A discloses a pintle injector, a rocket engine, and a rocket. The pintle injector includes a pintle and a bushing sleeved on the pintle. An annular liquid channel is formed between the bushing and the pintle; the liquid channel includes a central flow channel arranged along the axial direction of the pintle and a self-excited oscillation cavity; the self-excited oscillation cavity includes a contraction section, a sudden expansion section, and a straight circular section, and the flow channel diameter of the straight circular section is between that of the contraction section and the sudden expansion section; the central flow channel communicates with the contraction section, and the flow channel diameter of the central flow channel is larger than that of the contraction section; a radial annular gap is formed between one end of the pintle and the outlet end of the bushing.

[0004] Generally, a pintle injector is provided with two mutually sleeved flow channels for injecting fuel and oxidizer respectively. The above-mentioned prior art can only adjust the flow rate of one of the flow channels and cannot achieve any mixing ratio of fuel and oxidizer. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a pintle injector to solve the technical problem that any mixing ratio of fuel and oxidizer cannot be achieved in the prior art.

[0006] To achieve the above technical purpose, the present invention takes the following technical solutions: The present invention provides a pintle injector, including: A housing provided with an installation channel; A pintle assembly disposed in the installation channel. A first flow channel is formed in the pintle assembly, and a first injection port communicating with the first flow channel is provided on the outer periphery of one end of the pintle assembly; A sliding sleeve assembly axially movably sleeved on the outer periphery of the pintle assembly along the pintle assembly. The sliding sleeve assembly is used to adjust the opening and closing of the first injection port. A second flow channel is formed between the sliding sleeve assembly and the side wall of the installation channel, and the end of the second flow channel facing the first injection port is open to form a second injection port; and An adjustment assembly disposed in the second flow channel, and the adjustment assembly is used to adjust the flow rate of the second flow channel.

[0007] In some embodiments, the adjusting assembly includes a mounting ring, a plurality of adjusting members, and a driving unit. The mounting ring is disposed in the second flow channel. The plurality of adjusting members are sequentially arranged along the circumferential direction of the mounting ring. The adjusting members are movably arranged closer to and farther from the middle of the second flow channel so as to be able to block or open the second flow channel. The driving unit is connected to the plurality of adjusting members and is used to drive the plurality of adjusting members to move synchronously.

[0008] In some embodiments, the mounting ring is provided with a plurality of sliding grooves. The adjusting member is provided with a sliding column and a driving column. The plurality of sliding columns are correspondingly slidably mounted in the plurality of sliding grooves. The driving unit includes a driving ring and a first driving mechanism. The driving ring is rotatably mounted on the mounting ring. The driving ring is provided with a plurality of driving grooves. The plurality of driving columns are correspondingly slidably mounted in the plurality of driving grooves so as to drive the adjusting member to move by rotating the driving ring. The first driving mechanism is connected to the driving ring.

[0009] In some embodiments, the first driving mechanism includes a toothed ring, a gear, and a first driving motor. The toothed ring is sleeved on the outer periphery of the driving ring. The gear is rotatably mounted in the second flow channel. The gear meshes with the toothed ring. The first driving motor is connected to the gear.

[0010] In some embodiments, at least part of the side surface of the second flow channel is tapered to form a first tapered surface. At least part of the outer side surface of the sliding sleeve assembly is tapered to form a second tapered surface. The first tapered surface corresponds to the second tapered surface so that when the sliding sleeve assembly moves, the minimum distance between the first tapered surface and the second tapered surface is adjustable.

[0011] In some embodiments, the needle bolt assembly includes a cylinder body and a central rod. The cylinder body is mounted in the mounting channel and both ends thereof extend out of the mounting channel. The central rod is disposed in the cylinder body. The central rod and the cylinder body enclose to form the first flow channel. A stop portion is provided at one end of the central rod extending out of the cylinder body. The stop portion and the end of the cylinder body are spaced apart to form the first injection port.

[0012] In some embodiments, the stop portion is provided with a third flow channel communicating with the first flow channel. The third flow channel is inclined in the direction of the middle of the central rod in the direction of the medium flow.

[0013] In some embodiments, a plurality of spiral rib plates are provided in the first flow channel. The plurality of spiral rib plates are spaced apart along the circumferential direction of the central rod.

[0014] In some embodiments, the sliding sleeve assembly includes a sliding sleeve and a second driving mechanism. The sliding sleeve is slidably sleeved on the outer periphery of the bolt assembly along its axial direction. The sliding sleeve is used to adjust the opening and closing of the first injection port, and the second driving mechanism is connected to the sliding sleeve.

[0015] In some embodiments, the second driving mechanism includes two driving groups. The two driving groups are located on opposite sides of the sliding sleeve. Each driving group includes a nut, a lead screw, and a second driving motor. The nut is arranged on the sliding sleeve. The lead screw is rotatably installed in the housing. The lead screw is in threaded cooperation with the nut, and the second driving motor is connected to the lead screw.

[0016] Compared with the prior art, in the bolt injector provided by the present invention, the bolt assembly is arranged in the installation channel. A first flow channel is formed in the bolt assembly. A first injection port communicating with the first flow channel is provided on the outer periphery of one end of the bolt assembly. The first flow channel is used to convey liquid oxygen and inject liquid oxygen into the combustion chamber from the first injection port. And the first injection ports are arranged in a circular pattern on the circumference of the bolt assembly, so that the liquid oxygen is ejected radially. The sliding sleeve assembly is slidably sleeved on the outer periphery of the bolt assembly. When the sliding sleeve assembly moves, it can block the first injection port, thereby adjusting the opening and closing degree of the first injection port to realize the flow rate adjustment of the first flow channel. A second injection port is provided at the end of the second flow channel. The second flow channel is used to convey fuel and inject fuel into the combustion chamber along its axial direction from the second injection port, so as to guide the fuel to impact and atomize with the liquid oxygen, so that the two can be fully mixed, thereby improving the combustion efficiency. And an adjustment component is arranged in the second flow channel, so as to adjust the flow rate in the second flow channel through the adjustment component, and further adjust the flow rate of the fuel. By the combined use of the sliding sleeve assembly and the adjustment component, the flow rates in the first flow channel and the second flow channel can be adjusted simultaneously, so as to realize any mixing ratio of the fuel and the oxidant, and further achieve the stable control of the combustion chamber pressure.

[0017] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the description, the preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. The specific implementation manners of the present invention are given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an embodiment of the bolt injector provided by the present invention; Figure 2 is Figure 1 the main view cross-sectional view of the bolt injector in Figure 3 is Figure 2 the partial enlarged schematic view of part A in Figure 4 is Figure 2 a partial schematic view in Figure 5 is Figure 1 the front cross-sectional view of another perspective of the needle bolt injector in Figure 6 is Figure 1 the three-dimensional schematic view of the needle bolt assembly, the sliding sleeve assembly and the adjusting assembly in Figure 7 is Figure 6 the three-dimensional schematic view of the adjusting assembly in Figure 8 is Figure 6 the exploded schematic view of the adjusting assembly in Figure 9 is Figure 6 the three-dimensional schematic view of the adjusting part in Figure 10 is Figure 6 the front cross-sectional view of the needle bolt assembly and the sliding sleeve assembly in Figure 11 is Figure 6 the front cross-sectional view of the needle bolt assembly and the sliding sleeve in Figure 12 is Figure 1 the front cross-sectional view of the housing in

[0019] Explanation of reference numerals: 1 - housing, 11 - installation channel, 12 - second flow channel, 121 - first conical surface, 13 - second injection port, 14 - upper housing, 15 - connection disk, 151 - disk cavity, 152 - connection flow channel, 16 - bottom plate, 2 - needle bolt assembly, 21 - first flow channel, 22 - first injection port, 23 - cylinder, 24 - central rod, 25 - stop portion, 251 - third flow channel, 26 - spiral rib plate, 3 - sliding sleeve assembly, 31 - sliding sleeve, 311 - second conical surface, 32 - drive group, 321 - nut, 322 - lead screw, 323 - second drive motor, 4 - adjusting assembly, 41 - mounting ring, 411 - chute, 42 - adjusting part, 421 - sliding column, 422 - drive column, 43 - drive ring, 431 - drive slot, 44 - gear ring, 45 - gear, 46 - first drive motor. Detailed implementation manners

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] In order to solve the technical problem in the prior art that it is impossible to achieve an arbitrary mixing ratio of fuel and oxidizer, the present invention provides a pintle injector. By the combined use of the sliding sleeve assembly and the adjusting assembly, the flow rates in the first flow channel and the second flow channel can be adjusted simultaneously, so as to achieve an arbitrary mixing ratio of fuel and oxidizer, and further achieve the stable control of the combustion chamber pressure.

[0022] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the pintle injector in an embodiment of the present invention.

[0023] The present invention provides a pintle injector, including a housing 1, a pintle assembly 2, a sliding sleeve assembly 3 and an adjusting assembly 4. The housing 1 is provided with an installation channel 11; the pintle assembly 2 is arranged in the installation channel 11. A first flow channel 21 is formed in the pintle assembly 2, and a first injection port 22 communicating with the first flow channel 21 is provided on the outer periphery of one end of the pintle assembly 2; the sliding sleeve assembly 3 is axially movably sleeved on the outer periphery of the pintle assembly 2. The sliding sleeve assembly 3 is used to adjust the opening and closing of the first injection port 22. A second flow channel 12 is formed between the sliding sleeve assembly 3 and the side wall of the installation channel 11. One end of the second flow channel 12 facing the first injection port 22 is open to form a second injection port 13; and the adjusting assembly 4 is arranged in the second flow channel 12, and the adjusting assembly 4 is used to adjust the flow rate of the second flow channel 12.

[0024] In this embodiment, please refer to Figures 2 to 4 , the pintle assembly 2 is arranged in the installation channel 11. A first flow channel 21 is formed in the pintle assembly 2. A first injection port 22 communicating with the first flow channel 21 is provided on the outer periphery of one end of the pintle assembly 2. The first flow channel 21 is used to transport liquid oxygen and inject liquid oxygen into the combustion chamber from the first injection port 22. And the first injection port 22 is arranged in a circular shape on the circumference of the pintle assembly 2, so that the liquid oxygen is sprayed radially. The sliding sleeve assembly 3 is slidably sleeved on the outer periphery of the pintle assembly 2. When the sliding sleeve assembly 3 moves, it can block the first injection port 22, so as to adjust the opening and closing degree of the first injection port 22 to realize the flow rate adjustment of the first flow channel 21. A second injection port 13 is provided at the end of the second flow channel 12 to improve the combustion efficiency. And an adjusting assembly 4 is arranged in the second flow channel 12, so as to adjust the flow rate in the second flow channel 12 through the adjusting assembly 4, and further adjust the flow rate of the fuel. By the combined use of the sliding sleeve assembly 3 and the adjusting assembly 4, the flow rates in the first flow channel 21 and the second flow channel 12 can be adjusted simultaneously, so as to achieve an arbitrary mixing ratio of fuel and oxidizer, and further achieve the stable control of the combustion chamber pressure.

[0025] In this embodiment, please refer toFigure 2 and Figure 5 , the installation channel 11 extends in the vertical direction and forms openings on the upper and lower sides of the housing 1. The bolt assembly 2 is integrally columnar, with a diameter smaller than that of the installation channel 11. The bolt assembly 2 is installed in the installation channel 11, and both ends thereof extend out of the installation channel 11. The bolt assembly 2 is coaxially spaced from the side wall of the installation channel 11, so that a gap is formed between the bolt assembly 2 and the side wall of the installation channel 11. The first flow channel 21 is located in the middle of the bolt assembly 2 and extends in the vertical direction. The upper end of the first flow channel 21 is the inlet, and the first injection port 22 communicates with the lower end of the first flow channel 21. The inner diameter of the sliding sleeve assembly 3 is adapted to the outer diameter of the bolt assembly 2. The sliding sleeve assembly 3 is in sealing cooperation with the bolt assembly 2. The space between the sliding sleeve assembly 3 and the side wall of the installation channel 11 forms the second flow channel 12, and the lower end of the second flow channel 12 is the second injection port 13.

[0026] Specifically, please refer to Figure 2 , Figure 5 and Figure 12 , the installation channel 11 is divided into a first section and a second section from top to bottom. The upper end of the first section is constricted. The bolt assembly 2 is fixedly connected to the upper end of the first section. The diameter of the first section is larger than that of the second section. The annular space between the sliding sleeve assembly 3 and the second section forms the second flow channel 12. The housing 1 is further provided with a connecting flow channel 152, which is located beside the bolt assembly 2. The connecting flow channel 152 penetrates through the first section and communicates with the second flow channel 12 to convey fuel to the second flow channel 12 through the connecting flow channel 152.

[0027] Furthermore, please refer to Figure 2 , Figure 5 and Figure 12 , the housing 1 includes an upper shell 14, a connecting disk 15 and a bottom plate 16. The upper shell 14, the connecting disk 15 and the bottom plate 16 are sequentially connected from top to bottom. The upper shell 14 and the bottom plate 16 jointly enclose to form the first section. A channel is formed through the middle of the bottom plate 16 to form the second section. A disk cavity 151 and a through hole communicating with the disk cavity 151 are provided in the middle of the connecting disk 15. The connecting disk 15 is sleeved on the outer periphery of the sliding sleeve assembly 3. The upper side of the connecting disk 15 is in sealing cooperation with the sliding sleeve assembly 3. The through hole communicates the second flow channel 12 and the disk cavity 151. A column is convexly provided on the upper side of the connecting disk 15, and the column extends out of the upper shell 14. The connecting flow channel 152 is formed in the column, and the connecting flow channel 152 connects the disk cavity 151.

[0028] In this embodiment, please refer to Figures 6 to 9, the adjustment assembly 4 includes a mounting ring 41, a plurality of adjusting members 42 and a driving unit. The mounting ring 41 is arranged in the second flow channel 12. The plurality of adjusting members 42 are sequentially arranged along the circumferential direction of the mounting ring 41. The adjusting members 42 are movably arranged closer to and farther from the middle of the second flow channel 12 so as to be able to block or open the second flow channel 12. The driving unit is connected to the plurality of adjusting members 42 and is used to drive the plurality of adjusting members 42 to move synchronously.

[0029] Specifically, a groove is provided in the middle of the bottom plate 16. An installation cavity is formed by enclosing between the bottom plate 16 and the connection disk 15. The installation cavity communicates with the second flow channel 12. The mounting ring 41 is installed in the installation cavity, and the inner diameter of the mounting ring 41 is the same as the outer diameter of the second flow channel 12. The plurality of adjusting members 42 are evenly installed on the mounting ring 41. Adjacent two adjusting members 42 are in contact with each other, so that the plurality of adjusting members 42 form an annular structure with an adjustable inner diameter. When the driving unit drives the plurality of adjusting members 42 to move towards the middle of the second flow channel 12, the adjusting members 42 can extend into the second flow channel 12, and the inner diameter of the annular structure gradually decreases, thereby being able to block the second flow channel 12 and reduce the diameter of the second flow channel 12 to reduce the flow rate of the second flow channel 12. When the driving unit drives the plurality of adjusting members 42 to move away from the middle of the second flow channel 12, the adjusting members 42 can withdraw from the second flow channel 12, and the inner diameter of the annular structure gradually increases, thereby being able to open the second flow channel 12 and restore the diameter of the second flow channel 12 to the initial state to increase the flow rate of the second flow channel 12.

[0030] In this embodiment, please refer to Figures 7 to 9 , the mounting ring 41 is provided with a plurality of sliding grooves 411. The adjusting member 42 is provided with a sliding column 421 and a driving column 422. The plurality of sliding columns 421 are correspondingly slidably installed in the plurality of sliding grooves 411. The driving unit includes a driving ring 43 and a first driving mechanism. The driving ring 43 is rotatably installed on the mounting ring 41. The driving ring 43 is provided with a plurality of driving grooves 431. The plurality of driving columns 422 are correspondingly slidably installed in the plurality of driving grooves 431 to drive the adjusting member 42 to move by rotating the driving ring 43. The first driving mechanism is connected to the driving ring 43.

[0031] Specifically, a plurality of sliding grooves 411 are provided on the upper side of the mounting ring 41. The plurality of sliding grooves 411 are arranged at intervals along the circumferential direction of the mounting ring 41. The sliding grooves 411 are inclined, that is, the sliding grooves 411 form a certain angle with the radial direction of the mounting ring 41. The plurality of sliding grooves 411 correspond to the plurality of adjusting members 42 one by one. A sliding column 421 is provided on the lower side of the adjusting member 42. The sliding column 421 is slidably mounted in the sliding groove 411. The driving ring 43 is rotatably mounted on the upper side of the mounting ring 41. The driving ring 43 is provided with driving grooves 431 corresponding to the plurality of sliding grooves 411 one by one. The driving grooves 431 extend along the radial direction of the driving ring 43. A driving column 422 is provided on the upper side of the adjusting member 42. The driving column 422 is slidably mounted in the driving groove 431. The first driving mechanism is connected to the driving ring 43 to drive the driving ring 43 to rotate. When the driving ring 43 rotates, the adjusting member 42 approaches or moves away from the middle of the second flow channel 12 along a spiral trajectory under the cooperation of the sliding groove 411 and the driving groove 431, ensuring that two adjacent adjusting members 42 are always in contact with each other, and improving the accuracy of flow rate adjustment.

[0032] Further, a receiving groove is provided on the lower side of the driving ring 43, and the plurality of adjusting members 42 are located in the receiving groove.

[0033] In this embodiment, please refer to Figures 6 to 9 , the first driving mechanism includes a gear ring 44, a gear 45 and a first driving motor 46. The gear ring 44 is sleeved on the outer periphery of the driving ring 43. The gear 45 is rotatably mounted in the second flow channel 12. The gear 45 meshes with the gear ring 44. The first driving motor 46 is connected to the gear 45.

[0034] Specifically, the gear 45 is rotatably mounted on the axis in the vertical direction in the mounting cavity and meshes with the gear ring 44. The first driving motor 46 is provided on the upper side of the housing 1. The main shaft of the first driving motor 46 is connected to the gear 45 through a connecting shaft, and then drives the driving ring 43 to rotate through the meshing of the gear ring 44 and the gear 45.

[0035] Further, the first driving motor 46 is a motor or a servo motor with an angle sensor and a reduction gear 45 group, so as to achieve precise control.

[0036] In this embodiment, please refer to Figure 3 、 Figure 11 and Figure 12, at least part of the side surface of the second flow channel 12 is conically arranged to form a first conical surface 121; at least part of the outer side surface of the sliding sleeve assembly 3 is conically arranged to form a second conical surface 311; the first conical surface 121 corresponds to the second conical surface 311, so that when the sliding sleeve assembly 3 moves, the minimum distance between the first conical surface 121 and the second conical surface 311 can be adjusted.

[0037] Specifically, the first conical surface 121 is located at the connection between the disc cavity 151 and the second flow channel 12, and the first conical surface 121 is tapered from top to bottom. The sliding sleeve assembly 3 is provided with a second conical surface 311 at the position corresponding to the first conical surface 121, and the second conical surface 311 is also tapered from top to bottom. In this way, when the sliding sleeve assembly 3 moves along the set direction, the minimum distance between the first conical surface 121 and the second conical surface 311 can be adjusted, and then the flow channel of the second flow channel 12 can be assisted to be adjusted. When the sliding sleeve assembly 3 moves upward, the opening degree of the first injection port 22 can be increased, and at the same time, the minimum distance between the first conical surface 121 and the second conical surface 311 can be increased, thereby increasing the flow rate of the second flow channel 12. When the sliding sleeve 31 moves downward, the opening degree of the first injection port 22 is reduced, and at the same time, the minimum distance between the first conical surface 121 and the second conical surface 311 is reduced, thereby reducing the flow rate of the second flow channel 12.

[0038] Further, the included angle between the first conical surface 121 and the horizontal direction is smaller than the included angle between the second conical surface 311 and the horizontal direction.

[0039] In this embodiment, please refer to Figure 11 , the plunger assembly 2 includes a cylinder body 23 and a central rod 24. The cylinder body 23 is installed in the installation channel 11 and both ends thereof extend out of the installation channel 11. The central rod 24 is arranged in the cylinder body 23. The central rod 24 and the cylinder body 23 enclose to form the first flow channel 21. A stop portion 25 is provided at one end of the central rod 24 extending out of the cylinder body 23. The stop portion 25 and the end of the cylinder body 23 are arranged at intervals to form the first injection port 22.

[0040] Specifically, the cylinder body 23 is coaxially installed in the installation channel 11, the central rod 24 is coaxially installed in the cylinder body 23, and the annular space formed between the central rod 24 and the cylinder body 23 constitutes the first flow channel 21. The lower end of the central rod 24 extends out of the cylinder body 23 and is provided with the stop portion 25. The stop portion 25 and the end face at the lower end of the cylinder body 23 are arranged at intervals in the vertical direction. The annular gap between the stop portion 25 and the cylinder body 23 constitutes the first injection port 22. Moreover, the diameter of the stop portion 25 is larger than the outer diameter of the cylinder body 23, and the stop portion 25 is adapted to the sliding sleeve assembly 3, so that when the sliding sleeve assembly 3 moves downward, the lower end of the sliding sleeve assembly 3 can abut against the stop portion 25, thereby completely blocking the first injection port 22.

[0041] Furthermore, there is no limitation on the connection manner between the stop portion 25 and the central rod 24. In this embodiment, the stop portion 25 and the central rod 24 are connected by bolts.

[0042] Furthermore, the upper end of the central rod 24 is tapered. Such a setting can reduce the flow resistance, enabling the liquid oxygen to flow more smoothly.

[0043] In this embodiment, please refer to Figure 4 , in order to reduce the ablation of the stop portion 25, the stop portion 25 is provided with a third flow channel 251 communicating with the first flow channel 21. The third flow channel 251 is inclined in the direction of the middle of the central rod 24 in the medium flow direction. By providing the third flow channel 251, the ablation effect of the gas on the head of the needle bolt assembly 2 can be effectively weakened, improving the durability.

[0044] Furthermore, there are multiple third flow channels 251, and the multiple third flow channels 251 are arranged at intervals along the circumferential direction of the stop portion 25.

[0045] In this embodiment, please refer to Figure 4 , multiple spiral rib plates 26 are provided in the first flow channel 21, and the multiple spiral rib plates 26 are arranged at intervals along the circumferential direction of the central rod 24. The spiral rib plates 26 connect the central rod 24 and the cylinder body 23, thereby fixing the central rod 24 in the cylinder body 23. By providing the spiral rib plates 26, the radial velocity when the liquid oxygen flows out is increased, further optimizing the injection effect. At the same time, by providing the spiral rib plates 26, a tangential velocity relative to the axis can be provided for the liquid flow, thereby throwing the liquid flow to the outer side wall of the first flow channel, and thus compensating for the pressure loss of the needle bolt injector.

[0046] In this embodiment, please refer to Figures 10 to 11, the sliding sleeve assembly 3 includes a sliding sleeve 31 and a second driving mechanism. The sliding sleeve 31 is slidably sleeved on the outer periphery of the bolt assembly 2 along its axial direction. The sliding sleeve 31 is used to adjust the opening and closing of the first injection port 22, and the second driving mechanism is connected to the sliding sleeve 31.

[0047] Specifically, the diameter of the sliding sleeve 31 is slightly larger than the diameter of the cylinder body 23. The sliding sleeve 31 is slidably sleeved on the outer periphery of the cylinder body 23 in the vertical direction, and a sealing member is provided between the sliding sleeve 31 and the cylinder body 23 to ensure the seal between the two, which can ensure that during the rapid start and stop process of the engine, the residual fuel in the injection device will not generate too much residual impulse on the engine after shutdown, thereby improving the safety and reliability of the engine operation. The sliding sleeve 31 includes an installation section, a connection section, and a blocking section connected in sequence from top to bottom. Both the installation section and the blocking section are provided in a straight cylinder shape, and the outer diameter of the installation section is larger than the outer diameter of the blocking section. The connection section is provided in a conical shape, and its outer side surface tapers from top to bottom. The outer side surface of the connection section constitutes the second conical surface 311. Such a setting is beneficial to adjusting the flow rate of the second flow channel 12. Ear plates are formed on opposite sides of the upper end of the sliding sleeve 31. The second driving mechanism is connected to the ear plates and drives the sliding sleeve 31 to slide in the vertical direction through the second driving mechanism.

[0048] In this embodiment, please refer to Figure 10 , the second driving mechanism includes two driving groups 32. The two driving groups 32 are located on opposite sides of the sliding sleeve 31. Each driving group 32 includes a nut 321, a lead screw 322, and a second driving motor 323. The nut 321 is provided on the sliding sleeve 31. The lead screw 322 is rotatably installed in the housing 1. The lead screw 322 is in threaded cooperation with the nut 321, and the second driving motor 323 is connected to the lead screw 322.

[0049] Specifically, the second driving motor 323 is installed on the upper side of the upper housing 14. The lead screw 322 is located in the first section. The lower end of the lead screw 322 is rotatably installed on the connection disk 15 through a bearing. The upper end of the lead screw 322 is connected to the main shaft of the second driving motor 323 through a coupling. The nut 321 is installed on the ear plate. The lead screw 322 is in threaded cooperation with the nut 321, so as to drive the sliding sleeve 31 to move by the forward and reverse rotation of the lead screw 322.

[0050] Furthermore, the second drive motor 323 is fixed to the housing by a motor support seat with optimized topological structure, which can ensure a high degree of stability in its transmission process. The motor support seat with topological optimization not only has good mechanical strength, but also can maximize the support effect on the second drive motor 323 while reducing its own weight. This setting makes the installation of the second drive motor 323 on the housing more stable, laying a solid foundation for the stable operation of the entire anchor bolt injector.

[0051] Furthermore, the second drive motor 323 is a servo motor or a stepper motor. As a power source, the servo motor or the stepper motor can precisely control the movement of the sliding sleeve 31.

[0052] For a better understanding of the present invention, the following will Figures 1 to 12 describe the technical solution of the present invention in detail: The first flow channel 21 is used to convey liquid oxygen and inject the liquid oxygen into the combustion chamber from the first injection port 22. The first injection port 22 is arranged in a circular shape around the circumference of the needle plug assembly 2, so that the liquid oxygen is ejected radially. The second flow channel 12 is arranged around the outer circumference of the first flow channel 21. The second flow channel 12 is used to convey fuel and inject the fuel into the combustion chamber along its axial direction from the second injection port 13. The injection directions of the two are mutually crossed, so as to guide the fuel and the liquid oxygen to impact and atomize, enabling the two to be fully mixed, and a liquid film can be formed on the inner wall of the combustion chamber, effectively preventing the inner wall of the combustion chamber from being ablated and extending the service life of the combustion chamber. The sliding sleeve 31 is slidably installed on the outer circumference of the cylinder body 23 in the vertical direction. When the sliding sleeve 31 slides downward, it can gradually block the first injection port 22, thereby reducing the flow rate of the first flow channel 21. When the sliding sleeve 31 slides upward, it can gradually open the first injection port 22, thereby increasing the flow rate of the first flow channel 21. By the movement of the sliding sleeve 31, the opening degree of the first injection port 22 is adjusted, thereby realizing the flow rate adjustment of the first flow channel 21. A plurality of adjusting members 42 are arranged circumferentially on the mounting ring 41, and two adjacent adjusting members 42 are in contact with each other, so that the plurality of adjusting members 42 form an annular structure with an adjustable inner diameter. When the driving unit drives the plurality of adjusting members 42 to move towards the middle of the second flow channel 12, the adjusting members 42 can extend into the second flow channel 12, and the inner diameter of the annular structure gradually decreases, thereby being able to block the second flow channel 12 and reducing the diameter of the second flow channel 12 to reduce the flow rate of the second flow channel 12. When the driving unit drives the plurality of adjusting members 42 to move away from the middle of the second flow channel 12, the adjusting members 42 can withdraw from the second flow channel 12, and the inner diameter of the annular structure gradually increases, thereby being able to open the second flow channel 12 and restoring the diameter of the second flow channel 12 to the initial state to increase the flow rate of the second flow channel 12. By the movement of the adjusting members 42, the flow rate adjustment of the second flow channel 12 is realized. And at least part of the side surface of the second flow channel 12 is arranged in a conical shape to form a first conical surface 121, and at least part of the outer side surface of the sliding sleeve 31 is arranged in a conical shape to form a second conical surface 311. When the sliding sleeve assembly 3 moves along the set direction, the minimum distance between the first conical surface 121 and the second conical surface 311 can be adjusted, and then the flow channel of the second flow channel 12 can be assisted in adjusting. When the sliding sleeve assembly 3 moves upward, the opening degree of the first injection port 22 can be increased, and at the same time the minimum distance between the first conical surface 121 and the second conical surface 311 is increased, thereby increasing the flow rate of the second flow channel 12. When the sliding sleeve 31 moves downward, the opening degree of the first injection port 22 is reduced, and at the same time the minimum distance between the first conical surface 121 and the second conical surface 311 is reduced,Furthermore, the flow rate of the second flow channel 12 is reduced.

[0053] Through the movement of the sliding sleeve assembly 3 and the adjusting assembly 4 in this application, the fuel flow area can be adjusted at a relatively high efficiency rate, thereby achieving stable control of the combustion chamber pressure. During the operation of the sliding sleeve assembly 3, a specific driving and transmission mechanism causes the sliding sleeve 31 to displace, thereby precisely changing the effective cross-sectional area through which the fuel flows. This change can be based on the real-time monitoring data of the system and the preset control strategy to adjust the fuel flow rate within a short time, thereby effectively balancing the pressure fluctuations inside the combustion chamber and ensuring that the combustion chamber pressure is maintained within a stable range, providing a solid guarantee for the stable and efficient operation of related power systems, and enabling equipment such as engines to maintain good working performance and reliability under various working conditions.

[0054] Compared with the currently commonly used hydraulic adjustment method, the response speed of this application is faster. It can respond more sensitively to the fluctuations in the combustion chamber working conditions, which makes it particularly suitable for orbital maneuvering engines or main engines that require rapid large-range thrust changes.

[0055] The structure of this application is simple, greatly reducing the requirements for processing technology and reducing processing costs. At the same time, the simple structure also means more convenience during assembly, inspection, and maintenance, reducing the life cycle cost of the entire engine and improving the reliability and maintainability of the engine.

[0056] The control of this application is simple and easy to implement. The firmware can be easily modified according to the specific usage situation without any changes to the mechanical part. This flexibility enables the engine to better adapt to different mission requirements and working environments, improving the versatility and adaptability of the engine.

[0057] The specific embodiments of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pintle injector, characterized in that: It includes: A housing having a mounting channel; A pintle assembly is arranged in the installation channel, a first flow channel is formed in the pintle assembly, and a first injection port communicating with the first flow channel is arranged on the outer periphery of one end of the pintle assembly; a sleeve assembly, movably sleeved on the outer periphery of the pintle assembly along the axial direction of the pintle assembly, the sleeve assembly being used to adjust the opening and closing of the first injection port, a second flow channel being formed between the sleeve assembly and the side wall of the installation channel, and an end of the second flow channel being open toward the first injection port to form a second injection port; and The regulating component is arranged in the second flow channel, and the regulating component is used to regulate the flow rate of the second flow channel.

2. The pintle injector according to claim 1, characterized in that: The adjustment assembly includes a mounting ring, a plurality of adjustment members and a driving unit. The mounting ring is arranged in the second flow channel. The plurality of adjustment members are arranged sequentially on the mounting ring along the circumference of the mounting ring. The adjustment members are movably arranged close to and away from the middle of the second flow channel so as to be able to block or open the second flow channel. The driving unit is connected to the plurality of adjustment members and is used to drive the plurality of adjustment members to move synchronously.

3. The pintle injector according to claim 2, characterized in that: The mounting ring is provided with a plurality of slide grooves, the adjusting member is provided with a slide column and a driving column, and the plurality of slide columns are correspondingly slidably installed in the plurality of slide grooves; The driving unit includes a driving ring and a first driving mechanism. The driving ring is rotatably mounted on the mounting ring. The driving ring is provided with a plurality of driving grooves. A plurality of driving columns are correspondingly slidably mounted in the plurality of driving grooves so as to drive the adjusting member to move through the rotation of the driving ring. The first driving mechanism is connected to the driving ring.

4. The pintle injector according to claim 3, characterized in that: The first driving mechanism includes a gear ring, a gear and a first driving motor. The gear ring is sleeved on the outer circumference of the driving ring. The gear is rotatably installed in the second flow channel. The gear is meshed with the gear ring. The first driving motor is connected to the gear.

5. The pintle injector according to claim 1, characterized in that: At least part of the side surface of the second flow channel is tapered to form a first tapered surface; At least part of the outer side surface of the sliding sleeve assembly is conical to form a second conical surface; The first conical surface corresponds to the second conical surface, so that the minimum distance between the first conical surface and the second conical surface is adjustable when the sliding sleeve assembly moves.

6. The pincer injector according to claim 1, characterized in that: The needle bolt assembly includes a barrel and a center rod, the barrel is installed in the installation channel and its two ends extend out of the installation channel, the center rod is arranged in the barrel, the center rod and the barrel form the first flow channel, and a stopper is provided at one end of the center rod extending out of the barrel, and the stopper is spaced apart from the end of the barrel to form the first injection port.

7. The pintle injector according to claim 6, characterized in that: The blocking portion is provided with a third flow channel connected to the first flow channel, and the third flow channel is arranged obliquely toward the middle of the center rod in the medium flow direction.

8. The pintle injector according to claim 6, characterized in that: A plurality of spiral ribs are arranged in the first flow channel, and the plurality of spiral ribs are arranged at intervals along the circumference of the center rod.

9. The pincer injector according to claim 1, characterized in that: The sliding sleeve assembly includes a sliding sleeve and a second driving mechanism. The sliding sleeve is axially slidably sleeved on the outer periphery of the pintle assembly. The sliding sleeve is used to adjust the opening and closing of the first injection port. The second driving mechanism is connected to the sliding sleeve.

10. The pintle injector according to claim 9, characterized in that: The second driving mechanism includes two driving groups, and the two driving groups are located on opposite sides of the sliding sleeve. The driving group includes a nut, a screw rod and a second driving motor. The nut is arranged on the sliding sleeve, and the screw rod is rotatably installed on the housing. The screw rod is threadably matched with the nut, and the second driving motor is connected to the screw rod.

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